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PART 1 – GENERAL 3.1 DESCRIPTION OF EXISTING SUBSTRATES A. This specification is intended to outline the requirements for application of the PremiumCoat® system, in conjunction with the appropriate product technical data sheets, over approved roof substrates in acceptable condition. Specific addenda address each surface at the end of this guide specification. 1.2 DESCRIPTION OF LIQUID APPLIED ROOFING SYSTEM A. The Liquid Applied System consists of a polyester‐reinforced elastomeric acrylic system specifically designed for roofing installation. The system is 1) Approved by FMRC (Factory Mutual Research Corporation) according to the complete Standard 4470 for Class 1 Roof Constructions; 2) Classified and subjected to follow‐up by UL (Underwriters Laboratories); 3) Accepted by Miami‐Dade County; and 4) Manufactured in accordance with ISO 9001:2008 & 14001:2004 regulations. 1.3 SECTION INCLUDES A. Liquid Applied flexible acrylic waterproofing system for use over new or existing roofing. Work shall include the preparation of the roof surface, flashing, detailing, application of the roof system, and cleanup. 1.4 RELATED WORK A. Contractor shall review all sections of the project specifications to determine items of work that will interface with the application of this roofing system. Compliance with applicable building codes shall be assured by the specifier or project engineer, while coordination and execution of related sections shall be the responsibility of the approved contractor. 1.5 REFERENCES A. NRCA Roofing and Waterproofing Manual B. Factory Mutual RoofNav Directory C. Underwriters Laboratories Building Materials Directory D. Miami‐Dade County Product Control Section, Board and Code Administration E. ASTM D5034‐09(2013) Breaking Strength and Elongation of Textile Fabrics F. ASTM D3787‐07(2011) Bursting Strength of Textiles G. ASTM D1117‐01 Guide for Evaluating Nonwoven Fabric H. ASTM D1777‐96(2011) I. ASTM B117‐11 Thickness of Textile Materials Standard Practice for Operating Salt Spray (Fog) Apparatus J. ASTM G29‐96(2010) Test Methods for Algae Resistance K. ASTM E108‐11 Test Method for Fire Tests of Roof Coverings L. ASTM D1653‐13 Water Vapor Transmission of Organic Coating Films 1 LIQUID APPLIED ROOFING
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M. ASTM G155‐13 Practice for Operating Xenon Arc Light Apparatus for Exposure of Non‐Metallic Materials N. ASTM D412‐06a (2013) Tensile Properties of Vulcanized Rubber & Thermoplastic Elastomers O. ASTM D6083‐05e1 Standard Specification for Liquid Applied Acrylic Coating P. ASTM C1549‐09 Determination of Solar Reflectance at Near Ambient Temperature Using a Portable Solar Reflectometer Q. ASTM C1371‐04a (2010)e1 Determination of Emittance of Materials at Near Room Temperature Using Portable Emissometers R. FM 4470 Standard for Class 1 Spread of Flame, Windstorm Pressure,Windstorm Pull, Hail Damage, Resistance to Foot Traffic, and Susceptibility to Leakage 1.6 REVIEW / SUBMITTALS A. Shop Drawings: Submit a scale drawing illustrating layout of joint reinforcing and all flashing details. A. Product Data: Provide manufacturer’s published technical literature, MSDS, and warranty on products that make up the roofing system, including coatings, reinforcing fabrics, flashing materials, roof drains, fasteners, etc. B. Installation Instructions: Submit all data sheets available from the manufacturer on the installation of the roofing system applicable to the project. C. Submit manufacturer's Certificates of Compliance or Analysis that all products meet or exceed project requirements. If required, Contractor to supply samples or mockup. D. Applicator is responsible for submitting proof of appropriate GAF Certified Contractor Status. E. Prior to bid, all project specifications, details, and submittals shall be reviewed by manufacturer for pre‐approval and to comply with warranty requirements. Successful bidder should initiate warranty pre‐inspection process before commencing work. 1.7 QUALIFICATIONS A. Contractor Qualifications: The Applicator of the specified roofing material shall be a Certified Contractor designated by GAF. The Applicator shall provide a certified contractor letter from the roofing system manufacturer verifying the Contractor’s status, level, and ability to furnish the specified warranty type and term. B. Manufacturer Qualifications: Manufacturer shall have a minimum twenty (20) years manufacturing experience in the roof coating industry. 1.8 QUALITY CONTROL A. Codes and Standards: The contractor shall become thoroughly familiar with all codes, regulations and standards governing the specified work. Any contradiction between the manufacturer’s requirements and these specifications shall be brought to the attention of the manufacturer and the specifier or project engineer. B. Deviations: There shall not be any deviations from these specifications unless the deviation is submitted in writing to the specifier/project engineer. Any request for deviation must be approved in writing from the roofing manufacturer’s technical department delineating the details of the deviation. C. Training and Documentation: The Contractor is responsible for ensuring a trained foreman is on site during the installation of any GAF / Hydrostop™ products. A daily log of application activities and 2 LIQUID APPLIED ROOFING
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environmental conditions should be maintained and available on‐site with copies of technical data/application instructions & MSDS. D. Technical Inspections: The Manufacturer may require Technical Inspections based on warranty types and terms. These inspections include, but not limited to, pre‐construction, interim, and final inspections. Consult GAF Technical Services or a GAF Technical Sales Representative to confirm inspection requirements. 1.9 DELIVERY, STORAGE & HANDLING A. Deliver materials to jobsite in manufacturer's unopened and undamaged containers bearing the following information: 1. Name and Address of Manufacturer 2. Identification of Contents – Including Product Code 3. Net Volume of Contents 4. Lot or Batch Number 5. VOC Content 6. Storage Temperature Limits 7. Shelf Life and Expiration Date 8. Mixing Instructions and Proportions of Contents 9. Safety Information and Instructions B. Store and protect materials from damage and weather in accordance with manufacturer's published instructions. C. Ambient temperatures should range between 50 and 90°F (10 to 32°C). Keep out of direct sunlight. D. Place stored material containers on pallets and cover with tarpaulin tied to bottom of pallets. 1.10 ENVIRONMENTAL REQUIREMENTS A. Do not apply if ambient temperatures are expected to fall below 50°F (10°C), or if rain or heavy dew is anticipated before liquid coating component has cured. 1.11 WARRANTIES AND ELIGIBILITY A. Contractor to furnish GAF Warranty or Guarantee in accordance with project specifications. Contractor shall follow written application process in accordance with manufacturer’s warranty program. 1. GAF Liquid Applied Limited Product Warranty a. GAF Commercial Master or Master Select Restoration Contractors – Up to 10 Years b. GAF Premium Coating Systems Contractors – Up to 20 Years B. GAF Liquid Applied Emerald Pledge Labor and Material Warranty 1. GAF Commercial Master or Master Select Restoration Contractors – Up to 10 Years 2. GAF Premium Coating Systems Contractors – Up to 25 Years C. GAF Liquid Applied Diamond Pledge NDL Guarantee 1. GAF Premium Coating Systems Contractors Only – Up to 25 Years Refer to individual addenda at the end of this guide specification for application instructions as they relate to warranty / guarantee coverage. 3 LIQUID APPLIED ROOFING
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PART 2 – PRODUCTS 2.1 MANUFACTURUER A. GAF ‐ 1 Campus Drive Parsippany, New Jersey 07054, 1‐973‐628‐3000, www.gaf.com. 2.2 MEMBRANE COMPUND MATERIAL A. Waterproofing Material: PremiumCoat® System: three stage, fabric‐reinforced, flexible acrylic coating, fluid‐applied in successive steps to form a continuous, seamless, watertight membrane; 39 to 60 mils (1,143 to 1,524 micron) minimum cured total system thickness, comprised of the following: 1. Foundation and Saturation Coats: PremiumCoat® FoundationCoat (highly flexible, water‐ based, 100% pure acrylic polymer resin coatings). 2. Fabric: PremiumCoat® Fabric (polyester, non‐woven, stitch‐bonded and heat‐set fabric). 3. FinishCoat: PremiumCoat® FinishCoat (ultraviolet light‐resistant blend of highly flexible, water‐
based, 100% pure acrylic polymer resin coating). Color as selected from manufacturer's standard color chart. B. Reinforcing Fabric: PremiumCoat® Fabric shall be non‐woven, 100% polyester, stitch bonded, heat‐
set fabric with the following characteristics: Weight: 3 oz. / per square yard (102 grams/m²) Tensile Strength MD: 124 lbs. (56 kg) ASTM D5034 CD: 77 lbs. (35 kg) Elongation @ Break MD: 26% ASTM D5034 CD: 64% Ball Burst 109 lbs. (49 kg) ASTM D3787 Trapezoid MD: 17 lbs. (7.7 kg) ASTM D1117 CD: 20 lbs. (9.1 kg) Thickness 0.018 inches (0.457 mm) ASTM D1777 4 LIQUID APPLIED ROOFING
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C. Cured Membrane Characteristics ASTM D‐6083 Material Properties Property Krebs Viscosity Brookfield 6 rpm Viscosity
Volume Solids
Weight Solids
Tensile
Elongation
Elongation, Post 1,000 hrs Xenon
Tear Resistance
Accelerated Weathering @ 1,000 hrs
Low Temp Flex, Post 1,000 hrs Xenon
Water Swelling @ 7 days
Permeance (wet cup)
Wet Adhesion
Fungi Resistance
PremiumCoat® FinishCoat 130
66,400
52
66
207
306
148
93
Pass, no change
Pass -15F
9.2
3.9
8.7
0 rating
Method D-562 D-2196
D-2697
D-1644
D-2370
D-2370
D-2370
D-624
D-4798
D-522
D-471
D-1653
D-903
G-21
PremiumCoat® FoundationCoat 123
34,000
52
66
173
323
122
82
Pass, no change
Pass -15F
7.8
4.9
7.3
0 rating
Membrane Properties Property Wind Driven Rain
Elongation of Membrane
(40 mils DFT)
Tensile Strength of membrane
(40 mils DFT)
Tensile strength of membrane
(40 mils DFT)
Water vapor permeability
(40 mils DFT)
Cured Weight
Salt Spray
Algae Resistance:
Method TT-C-555B/D6904
ASTM D4798 (G155) and D2370
ASTM D-412
PremiumCoat® System Pass 0.0 lbs weight gain
MD: 36% @ 8000 hrs weathering
CD: 41% @ 8000 hrs weathering
MD: 65lbs/in-width @ 8000 hrs weathering
CD: 69lbs/in-width @ 8000 hrs
2210 PSI (13,789 kPa)
ASTM E-96
3-5 perms; a Class III vapor retarder
Generic
ASTM B-117
ASTM G-29
0.33 lbs per ft2 (56.8 oz. per m2)
No effects
0 rating
ASTM D4798 (G155) and D2370
IBC Code Approval Properties Property Exterior Fire
Interior Fire
Wind
IBC Test Reference ASTM E108/UL790
FM 4470 Calorimeter
FM 4470/4474 and TAS
114 D&J and TAS 125
Impact/Durability
Leakage
Hail
Weathering
FM 4470 Foot Traffic
FM 4470 ASTM D7281
FM 4470 Hail
ASTM D4798 (G155) and
D2370
ASTM Material Properties
Solar Reflectance
Thermal Emittance
SRI Index
Safety
Quality
ASTM D-6083
79% initial, 70% aged
0.9 initial and aged
99 initial, 86 aged
Generic
Generic
Rating Class A up to 4”/12” slope
Class 1
Concrete: 6,089 (psf)
LWIC: 4,621 (psf)
Polyisocyanurate: 1,189 (psf)
Smooth BUR: 2,261 (psf)
Granulated Cap Sheet: 1,753 (psf)
Pass
Pass a free standing membrane
Pass-Severe
40 mil system: Pass, maintained over
90% tensile strength after 8,000 hrs
ASTM Xenon-Acr.
Pass
Pass all standards
Pass all standards
Pass all standards
ISO 14001:2004
ISO 9001:2008
5 A2LA/ANSI Approved Lab File R26758 and FM RoofNav
FM RoofNav
FM RoofNav
Dade County NOAs
FM RoofNav
FM RoofNav Report J.I. 3000150
FM RoofNav
PRI-CMT HSI-012-02-01
PRI-CMT
CRRC/UL
CRRC/UL
CRRC/UL
ANSI/PJR
ANSI /PJR
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2.3 ACCESSORIES B. Cant Strips: Approved composition materials are EPS (Expanded Polystyrene), ISO (Polyisocyanurate), and wood (Non‐Pressure Treated). Refer to construction details for installation requirements as specified by GAF. C. Polyisocyanurate: EnergyGuard™ Polyisocyanurate Insulation with glass‐based facer meeting or exceeding the requirements for ASTM C1289 [min. 16 psi (1.1 kg/cm) compressive strength]. 1.5” (3.8 cm) minimum thickness. Max board size: 4’ x 8’ (1.2 m x 2.4 m) if mechanically fastened or 4’ x 4’ 1.2 m x 1.2 m) if adhered with Factory Mutual approved roofing adhesive. D. Polyisocyanurate: EnergyGuard™ Polyisocyanurate HD or HD Plus. 0.5” minimum thickness. Max board size: 4’ x 8’ (1.2 m x 2.4 m) if mechanically fastened or 4’ x 4’ 1.2 m x 1.2 m) if adhered with Factory Mutual approved roofing adhesive. E. Pywood: ¾” (2 cm) minimum thickness, tongue and groove exterior B & C grade. Plywood is to be adhered with sub‐floor adhesive and deck fasteners. F. Densdeck or Securock: ¼” (6 mm) minimum thickness if used over an approved, smooth existing substrate. The standard thickness recommendation is ½” (1.3 cm). G. Insulation Adhesives: GAF OlyBond, GAF LRF‐M, or GAF 2 Part Roofing Adhesive. H. Mechanical Fasteners: GAF Drill‐Tec™ membrane fasteners and plates, insulation fasteners and plates, and flashing fasteners and termination bars. I. BarrierGuard: Polymer modified cementitious slurry to fill cracks, voids, or low depressions on various substrates or embedded in PremiumCoat® Fabric as below grade waterproofing. J. Butter Grade: Single package, high solids acrylic, elastomeric sealant. K. HydroFiber: Bulking material used in conjunction with PremiumCoat®FoundationCoat or Butter Grade. L. HydroCaps: Fabric reinforcement for sealing metal fasteners. M. StableRust Primer: Water‐based, surfactant‐free primer used on direct‐to‐metal applications to stabilize and protect metal surfaces. N. CleanAct Primer: Water‐based cleaner used in EPDM surface preparation. O. SureBond Primer: Water‐based acrylic primer for sealing masonry, metal, and chalky surfaces. P. Unibase Primer: Penetrating adhesive/primer for saturating fabric and adhering coating. Q. GAF TPO Red Primer: VOC‐compliant, solvent‐based thermoplastic liquid to be applied to TPO to promote adhesion of water‐based coatings. R. TrafficCoat: Durable wear coating to provide additional abrasion resistance and color selection. 6 LIQUID APPLIED ROOFING
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S. UCC ‐ United Cleaning Concentrate: Non‐Toxic cleaner for use on existing elastomeric roof coatings metal surfaces, concrete and masonry substrates, as well as uncoated roof, deck and wall surfaces. T. GAF Epoxy Primer: Use to penetrate and seal porous substrates and to improve the adhesion of high performance topcoats. PART 3 – EXECUTION 3.1 EXAMINATION A. When applying a Liquid Applied Roofing System as a recover over an existing roofing system, GAF requires investigation of moisture in the existing system through various Moisture Survey methods. See Substrate Preparation Guide for Liquid Applied Roofing Systems for requirements. B. Verify that substrate surfaces are durable, free of frozen matter, dampness, loose particles, cracks, pits, projections, and/or foreign matter detrimental to adhesion or application of waterproofing system. C. Verify that substrate surfaces are smooth and not detrimental to full contact bond of waterproofing materials. Perform test patches to verify substrate suitability to receive the HydroStop PremiumCoat System. Field test methods are outlined in the GAF Substrate Preparation Guide for Liquid Applied Roofing Systems. D. Verify items that penetrate surfaces to receive waterproofing are securely installed and suitably flashed. E. Verify that substrate areas are adequately supported and firmly fastened in place. F. Verify that roof deck has a minimum slope of 0.25”/foot (2.1 cm/meter). G. Verify that roof does not have areas of ponding water. H. Verify that all contiguous walls are properly waterproofed. 1.1 PREPARATION A. Protect adjacent surfaces not designated to receive waterproofing. B. Inspect and make all necessary repairs to substrate. Remove and replace wet substrates and insulation, if applicable. C. At a minimum, clean and prepare surfaces to receive waterproofing by removing all dirt, dust, loose and flaking particles, grease and debris with the use of a stiff bristle push broom. Apply United Cleaning Concentrate and rinse per manufacturer’s instructions. Care should be taken not to inject water into the substrate during the preparation phase. Allow adequate time for complete drying after the cleaning process. 7 LIQUID APPLIED ROOFING
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D. Substrates with heavy contamination of grease, oils, dirt, etc. may require supplemental cleaning methods. Contact a GAF Technical Services or Technical Sales Representative for additional information. E. At a minimum, seal cracks and joints with Butter Grade and PremiumCoat Fabric. Repair additional substrate conditions per approved GAF details. Contact a GAF Technical Services or Technical Sales Representative for additional information. F. Refer to GAF Substrate Preparation Guide for Liquid Applied Roofing Systems for detailed substrate preparation procedures by individual substrate. G. Do not apply waterproofing to surfaces unacceptable to manufacturer, or under inclement environmental conditions. 1.2 APPLICATION A. Refer to individual addenda at the end of this guide specification for preparation and application requirements for specific substrates. 1.3 PROTECTION OF FINISHED WORK A. Monitor finished system for seven days, sweeping off any birdbaths to allow for full cure. 1.4 CLEANING A. Immediately clean surfaces not scheduled to receive waterproofing in accordance with manufacturer's instructions. END OF SECTION 8 LIQUID APPLIED ROOFING
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ADDENDUM 1 – Existing Membranes (BUR / APP / SBS / EPDM / Hypalon / PVC / TPO) 3.3 APPLICATION A. Preparation and Priming by Substrate: 1. Asphaltic Membranes (Smooth BUR / APP / SBS) a. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. b. Prime new asphaltic surfaces with UniBase Primer at a rate of .5 ‐1.0 gallon per square using a roof brush, roller, or airless sprayer. Coverage rate will vary by substrate porosity. For aged asphaltic surfaces, Unibase Primer is recommended to promote adhesion and enhance bleed‐
blocking. 2. PVC and Hypalon a. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. b. Adhesion test is required. If results are less than 2.0 pli, contact a GAF Technical Services or Technical Sales Representative to identify supplemental cleaning or priming requirements. 3. TPO a. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. b. Apply GAF TPO Red Primer at a rate of .5 gallons per square. 4. EPDM a. Apply CleanAct Primer at a rate of .2 gallons per square (5 squares per gallon). CleanAct should remain on the EPDM surface for 10‐30 minutes, followed by two separate power rinses, using clean water, at a minimum of 3,000 psi (20,680 kPa). b. Using a clean white towel, verify that all carbon black has been removed from the surface of the EPDM. Verify adhesion per Section 3.1.C. and repeat cleaning if necessary. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Roof Perimeter‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), waterproof entire roof perimeter. Continue waterproofing up vertical surfaces and onto the deck a minimum of 6” (15 cm) in each direction. 2. Roof Penetrations‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), seal any items projecting through waterproofing material to render them watertight. Extend waterproofing vertically up penetrations a minimum of 6” (15 cm). 3. Roof Field – Using 40” (1.0 m) Fabric and FoundationCoat components (as described above), reinforce the entire roof field. Overlap adjacent runs of Fabric a minimum of 4” (10 cm). C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 9 LIQUID APPLIED ROOFING
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2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness. End of Addendum 10 LIQUID APPLIED ROOFING
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ADDENDUM 2 – Lightweight, Structural and Precast Concrete 3.3 APPLICATION A. Preparation and Priming by Substrate 1. Structural and Precast Concrete a. New concrete must be allowed to cure for a minimum 28 days prior to application of primers. b. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. c. Apply one or more coats of GAF Epoxy Primer at .5 gallons per square depending on porosity of substrate. 2. Lightweight Insulating Concrete a. Due to variations in the applications and formulations of Lightweight Insulating Concrete, HydroStop PremiumCoat Systems over Lightweight Concrete must be reviewed and approved by GAF Technical Services on a project specific basis. Contact your Technical Service Representative for additional information. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Roof Perimeter‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), waterproof entire roof perimeter. Continue waterproofing up vertical surfaces and onto the deck a minimum of 6” (15 cm) in each direction. 2. Roof Penetrations‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), seal any items projecting through waterproofing material to render them watertight. Extend waterproofing vertically up penetrations a minimum of 6” (15 cm). 3. Roof Field – Using 40” (1.0 m) Fabric and FoundationCoat components (as described above), reinforce the entire roof field. Overlap adjacent runs of Fabric a minimum of 4” (10 cm). C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: 11 LIQUID APPLIED ROOFING
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a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness. End of Addendum 12 LIQUID APPLIED ROOFING
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ADDENDUM 3 – Polyisocyanurate Insulation, DensDeck, Securock, and Plywood 3.3 APPLICATION Newly Installed Polyisocyanurate Insulation, DensDeck, Securock, and Plywood do not require cleaning or priming. If using these substrates as a recovery board over an existing roof assembly, the contractor must apply proper Examination and General Preparation practices to the existing roof assembly as outlined in Sections 3.1 and 3.2 of this document. A. Attachment: Adhere or fasten insulation to deck with polyurethane adhesive or approved fasteners in accordance with manufacturer's installation instructions to meet a minimum uplift requirement of 1‐90. Verify the proper uplift requirements with the specifier or the local building code authority. 1. Stagger all board joints. Lay boards with edges in moderate contact, without forcing. Cut insulation to fit neatly to perimeter blocking and around penetrations through the roof. 2. Apply no more insulation than can be covered with waterproofing on the same day. 3. Install cant strips at internal corners and metal drip edge on outside perimeter. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Recovery Board Seams – Using 6” (30 cm) Fabric and FoundationCoat components (as described above), waterproof all board seams, cracks and non‐working joints. Center 6” (15 cm) fabric over all seams. 2. Roof Perimeter‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), waterproof entire roof perimeter. Continue waterproofing up vertical surfaces and onto deck a minimum of 6” (15 cm) in each direction. 3. Roof Penetrations‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above) seal any items projecting through waterproofing material so they are watertight. Waterproof up penetrations a minimum of 6” (15 cm). 4. Roof Field‐ Using 40” (1.0 m) Fabric and FoundationCoat components (as described above) seal the entire roof field. Overlap adjacent runs of fabric a minimum of 4” (10 cm). C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: 13 LIQUID APPLIED ROOFING
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a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness. End of Addendum 14 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
ADDENDUM 4 – Commercial Standing Seam Metal 3.3 APPLICATION PART 4 Newly Installed Polyisocyanurate Insulation, DensDeck, Securock, and Plywood do not require cleaning or priming. If using these substrates as a recovery board over an existing roof assembly, the contractor must apply proper Examination and General Preparation practices to the existing roof assembly as outlined in Sections 3.1 and 3.2 of this document. A. Attachment: Adhere or fasten insulation to deck with polyurethane adhesive or approved fasteners in accordance with manufacturer's installation instructions to meet a minimum uplift requirement of 1‐90. Verify the proper uplift requirements with the specifier or the local building code authority. 1. Stagger all board joints. Lay boards with edges in moderate contact, without forcing. Cut insulation to fit neatly to perimeter blocking and around penetrations through the roof. 2. Apply no more insulation than can be covered with waterproofing on the same day. 3. Install cant strips at internal corners and metal drip edge on outside perimeter. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Recovery Board Seams – Using 6” (30 cm) Fabric and FoundationCoat components (as described above), waterproof all board seams, cracks and non‐working joints. Center 6” (15 cm) fabric over all seams. 2. Roof Perimeter‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above), waterproof entire roof perimeter. Continue waterproofing up vertical surfaces and onto deck a minimum of 6” (15 cm) in each direction. 3. Roof Penetrations‐ Using 12” (30 cm) Fabric and FoundationCoat components (described above) seal any items projecting through waterproofing material so they are watertight. Waterproof up penetrations a minimum of 6” (15 cm). 4. Roof Field‐ Using 40” (1.0 m) Fabric and FoundationCoat components (as described above) seal the entire roof field. Overlap adjacent runs of fabric a minimum of 4” (10 cm). C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. 15 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness. End of Addendum 16 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
ADDENDUM 4 – Commercial Standing Seam Metal 3.3 APPLICATION A. Cleaning and Priming 1. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. 2. For mild rust: Prime substrate using Acrylex 400 Primer or StableRust Primer @ .33‐.67 gallon per square depending on substrate. 3. For severe rust : Prime substrate with Lock Down Primer @ .25 gallons per square 4. For Kynar® coated metal panels: Prime substrate using XR‐2000 @ .75 gallons per square. 5. For residual asphalt areas: Prime areas with UniBase Primer @ .50‐1.0 gallons per square depending on prepared substrate. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Roof Penetrations – Using 12” Fabric and Foundation Coat components (described above), seal any items projecting through waterproofing material watertight. Waterproof penetrations vertically a minimum of 6”. 2. Vertical Seams – Sealing vertical standing seams with Butter Grade is recommended, but may not be required for all standing seam profiles. Consult GAF Technical Services to verify flashing requirements by individual standing seam profile. 3. Horizontal laps – using 12” Fabric and Foundation Coat components (described above), seal all horizontal laps. Foundation Coat and Fabric components must be centered on the panels laps. Protect from weather until dry. 4. Exposed Mechanical Fasteners – Using either a Hydro Cap or a 6” x 6” piece of Fabric and Foundation Coat Component (described above), seal all mechanical fasteners. Protect from weather until dry. 5. Parapet & Vertical Wall junctions – Using 12” fabric Foundation Coat components (described above), waterproof all roof/wall junctions. Continue waterproofing up vertical surfaces and onto deck a minimum of 6” in each direction. C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. 17 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. Systems Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness where fabric is utilized. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness where fabric is utilized. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness where fabric is utilized. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness where fabric is utilized End of Addendum 18 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
ADDENDUM 6 – Historic Standing Seam Metal 3.3 APPLICATION A. Cleaning and Priming a. Verify Adhesion per Section 3.1.C. and prepare substrate per Section 3.2 of this Specification. b. For mild rust: Prime substrate using Acrylex 400 Primer or StableRust Primer @ .33‐.67 gallon per square depending on substrate. c. For severe rust : Prime substrate with Lock Down Primer @ .25 gallons per square d. For Kynar® Coated metal panels: Prime substrate using XR‐2000 @ .75 gallons per square. e. For residual asphalt areas: Prime areas with UniBase Primer @ .50‐1.0 gallons per square depending on prepared substrate. B. PremiumCoat® FoundationCoat & Fabric Components – This procedure consists of one coat of PremiumCoat® FoundationCoat (“FoundationCoat”) applied to the substrate at the rate of 1.25 to 2.0 gallons / square. HydroStop PremiumCoat® Fabric (“Fabric”) (sizes vary) laid into the wet FoundationCoat, and a second coat of FoundationCoat immediately applied over the top at the rate of of 1.25 to 2.0 gallons / square to saturate the Fabric. FoundationCoat is applied at a total rate of 2.5 to 4.0 gallons / square, depending on the texture and porosity of the substrate. FoundationCoat should only be applied using approved roof brushes. Rolling and/or spraying FoundationCoat is strictly prohibited. Total Dry Film Thickness of FoundationCoat & Fabric Components is a minimum 27 mils. 1. Roof Penetrations – Using 12” Fabric and Foundation Coat components (described above), seal any items projecting through waterproofing material watertight. Waterproof penetrations vertically a minimum of 6”. 2. Valleys and Peaks – using 12, 16, 24” Fabric and Foundation Coat components (described above), seal all valets and peaks. Foundation Coat and Fabric components must be centered in the valleys or on the peaks overlapping adjoining fabric. Protect from weather until dry. 3. Vertical or Horizontal Seams – using 6” Fabric and Foundation Coat components (described above), seal all vertical seams. Foundation Coat and Fabric components must be centered on the panels seams. Protect from weather until dry. 4. Vertical Pans – using 16” or 24” Fabric and Foundation Coat components (described above), seal all vertical pans. Foundation Coat and Fabric components must be centered in the vertical pans overlapping both adjoining 6” fabrics used on the vertical seams. Protect from weather until dry. (Note: most historical standing seam metal roofs have standing seams that are centered on 17” or 25”. For seams centered on 17” use 16” fabric and for 25” seams use 24” fabric.). 5. Parapet & Vertical Wall junctions – Using 12” fabric Foundation Coat components (described above), waterproof all roof/wall junctions. Continue waterproofing up vertical surfaces and onto deck a minimum of 6” in each direction. C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: 19 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness where fabric is utilized. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness where fabric is utilized. 20‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 3.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 25 mils. Completed PremiumCoat® System must be installed to a minimum 52 mil total cured thickness where fabric is utilized. 25‐Year Option – Apply a minimum of 3 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 4.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 33 mils. Completed PremiumCoat® System must be installed to a minimum 60 mil total cured thickness where fabric is utilized. End of Addendum 20 LIQUID APPLIED ROOFING
SECTION 07560
HYDROSTOP PREMIUMCOAT SYSTEM
ADDENDUM 7 – Renewal of Existing HydroStop Roofing Systems 3.3 APPLICATION A. EXAMINATION 1. The HydroStop Roofing System will be inspected by a GAF Field Service or Technical Sales Representative to determine eligibility for a recoat guarantee or warranty. 2. The GAF Field Service or Technical Sales Representative will provide a scope of repair to restore the system to a warrantable condition. B. Preparation 1. Contractor shall restore the roofing system per the established scope of work. 2. Clean per section 3.2C of this specification. C. PremiumCoat® Finish Coat Component: 1. Apply PremiumCoat® FinishCoat in multi‐directional passes. Apply each coat perpendicularly to the previous coat. 2. When applying PremiumCoat® FinishCoat in 3 or more coats on a single project, or to promote faster dry times of individual coats, alternate colors of PremiumCoat® FinishCoat may be applied. 3. Precautions: a. PremiumCoat® FinishCoat should not be applied at rates exceeding 1.5 gallons / square in a single coat. b. Atmospheric conditions may require application rates of less than 1.5 gallons /square per coat to allow for reasonable cure times, as well as preventing “cracking” of the FinishCoat. c. The installing contractor is responsible for adjusting application rates and number of coats installed based on conditions such as ambient temperature, relative humidity, and future weather forecasting as they relate to a specific application of the PremiumCoat® system. D. System Options for Warranty and Guarantee Coverage: 10‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 1.5 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 12.5 mils. Completed PremiumCoat® System must be installed to a minimum 39 mil total cured thickness where fabric is utilized. 15‐Year Option – Apply a minimum of 2 coats of PremiumCoat® FinishCoat (“FinishCoat”) at a total finished rate of 2.0 gallons / square. Allow to dry between coats. Total Dry Film Thickness of FinishCoat Component is 16.5 mils. Completed PremiumCoat® System must be installed to a minimum 43.5 mil total cured thickness where fabric is utilized. End of Addendum 21