KNIGHT WALL SYSTEMS – SL-PanelTek™
SECTION 09 25 13
ACRYLIC PLASTERING
GUIDE SPECIFICATION
Parex NuTech™ ACF is an exterior coating system for application to cement board wall coverings and soffits.
The NuTech ACF has four components:
1) Cementitious acrylic base coat, approximately 1/16" thick
2) Fiberglass reinforcing mesh embedded in the base coat, over an additional strip of fiberglass mesh placed
over cement board joints
3) Acrylic Primer (finish coat dependent)
4) Acrylic or elastomeric textured, colored finish
PART 1
1.01
GENERAL
SUMMARY
A.
Section Includes:
1. Installation of Parex base coat, reinforcing mesh and finish installed on National Gypsum
Permabase cement board or other approved by ParexLahabra
2. Cold-formed metal rain screen support framing /attachment system that may
accommodate up to 6” of exterior-insulation and minimizes thermal bridging versus
continuous furring strips.
B.
1.02
Related Sections:
1. Section 05 40 00
Cold-Formed Metal Framing
2. Section 06 10 00
Rough Carpentry
3. Section 07 21 00
Thermal Insulation
4. Section 07 25 00
Air Barriers
5. Section 07 62 00
Sheet Metal Flashing and Trim
6. Section 07 92 00
Joint Sealants
7. Section 09 21 16
Gypsum Board Assemblies
REFERENCES
A.
Reference Standards: Current edition at date of bid of drawings, requirements of the General
Conditions, Supplementary Conditions, and Division 1, General Requirements.
B.
American Iron and Steel Institute (AISI)
1. Code of Standard Practice
2. TS-1-02
Rotational-Lateral Stiffness Test Method for Beam-to-Panel Assemblies.
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C.
1.03
3. TS-3-02
Standard Methods for Determination of Uniform and Local Ductility.
4. TS-4-02
Standard Test Method for Determining the Tensile and Shear Strength of
Screws.
5. TS-5-02
Test Methods for Mechanically Fastened Cold-Formed Steel Connections.
6. TS-6-02
Standard Procedures for Panel and Anchor Structural Tests.
American Society for Testing and Materials (ASTM)
1. A 653-06
Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or ZincIron Alloy Coated (Galvannealed) by the Hot-Dip Process.
2. B 117
Standard Practice for Operating Salt Spray (Fog) Apparatus.
3. C 645
Standard Specification for Nonstructural Steel Framing Members.
4. C 1325
Specification for Non-Asbestos Fiber-Mat Reinforced Cement Substrate
Sheets
5. C 1513
Standard Specification for Steel Tapping Screws for Cold-Formed Steel
Framing Connections.
6. D 2247
Practice for Testing Water Resistance of Coatings in 100% Relative
Humidity.
7. E 84
Standard Test Method for Surface Burning Characteristics of Building
Materials.
8. E 331
Test Method for Water Penetration by Uniform Static Air Pressure
Difference.
9. E 695
Method for Measuring Relative Resistance to Impact Loading.
10. E 2486
Standard Test Method for Impact Resistance of Class PB and PI Exterior
Insulation and Finish Systems (EIFS)
11. G 153
Accelerated Weathering for Exposure of Nonmetallic Materials.
12. G 155
Accelerated Weathering for Exposure of Nonmetallic Materials.
SYSTEM DESCRIPTION
A.
An exterior coating system consisting of Base Coat with embedded Reinforcing Fabric Mesh,
Primer (Optional), and Finish Coat.
B.
Design / Performance Requirements
1. Structural Design: Exterior/interior wall cladding assemblies capable of withstanding
effects of load and stresses from dead loads, wind loads, snow loads and normal thermal
movement without evidence of permanent defects of assemblies or components.
a. Dead load: As required by [applicable building code] [_____________] .
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b. Live Load: As required by [applicable building code] [_____________]
c. Wind Load: Uniform pressure (velocity pressure) of [Insert Design Criteria] lb/sq ft.
[Insert Design Criteria], acting inward or outward.
d. Thermal Movements: Provide assemblies that allow for thermal movements
resulting from following maximum changes (range) in ambient and surface
temperatures by preventing buckling, opening of joints, overstressing of components
and other detrimental effects:
1)
Temperature Change (range): 120 degrees F (67 degrees C), ambient; 180
degrees F (100 degrees C), material surfaces.
2)
Panel joints shall allow movement of panels during expansion and
contraction while preventing uncontrolled penetration of moisture.
e. Manufacturing, installation, and sealing shall prevent deformation of exposed
surfaces.
2. Frequency and spacing of the wall brackets (and vertical ‘L’ track) shall be as shown on
shop drawings.
3. Additional horizontal mounting track may be required where panel size, penetrations, or
vibration and loading dictate.
4. Cement Board Cladding: Withstand code-imposed design loads and shall meet the testing
requirements of the Parex Product Performance Sheet.
5. System Water Penetration: No uncontrolled water penetration as defined in test method
when tested to ASTM E 331 at inward static pressure differential of not less than 6.24 psf
and not more than 12.0 psf.
6. Parex NuTech Stucco Functional Criteria
a. Height is limited to three stories without prior project-specific approval by
ParexLahabra, Inc.
b. The coating system and cement board sheathing do not form a weather barrier. A
continuous water resistive barrier, installed to the exterior of the sheathing that is
behind the cement board, and flashed to shed water to the exterior, is required.
c. Openings in the wall must be flashed to the water resistive barrier or to the exterior.
d. Building code conformance: The construction shall be acceptable for use under the
building code in force in the jurisdiction of the project.
e. Install expansion joints at floor lines of wood framed construction, substrate changes
and substrate expansion joints. Install vertical cement board control joints not more
than 50 feet (15.24 m) apart.
f.
Pitch of sloped surfaces shall be 6/12 minimum. The maximum horizontal run of
sloped surface shall be 8 inches (203 mm). For larger dimensions, consult
ParexLahabra Technical Services.
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7. Impact Resistance Classification: Parex NuTech Stucco shall be classified in accordance
with EIMA classification and impact ranges as follows.
EDITOR NOTE: COORDINATE BELOW IMPACT RESISTANCE CLASSIFICATION
REQUIREMENTS ACCORDING TO ASTM E2486 - STANDARD TEST METHOD FOR IMPACT
RESISTANCE OF CLASS PB AND PI EXTERIOR INSULATION AND FINISH SYSTEMS (EIFS)
a. Standard Impact Resistance, 25-49 in-lbs (2.8 – 5.6 J) Impact Range
b. Medium Impact Resistance, 50-89 in-lbs (5.7–10.1 J) Impact Range
c. High Impact Resistance, 90-150 in-lbs (10.2–17.0 J) Impact Range
d. Ultra High Impact Resistance, >150 in-lbs (> 17.0 J) Impact Range
EDITOR NOTE: INDICATE JOINT WIDTH ON DRAWINGS FOR MOVEMENT AND EXPANSION
AND CONTRACTION CONDITIONS. CONSULT WITH SEALANT MANUFACTURER FOR JOINT
DESIGN RECOMMENDATIONS AND WITH SUBSTRATE MANUFACTURER FOR
COORDINATION
1.04
1.05
SUBMITTALS
A.
Conform to submittal requirements of Section 01 33 00.
B.
Product Data: Manufacturer’s product literature, catalogs, and descriptions of testing
performed on system components to indicate that they will meet or exceed performance
specified herein. Include information and samples of wall panels and fasteners.
C.
Shop Drawings: Shop drawings from manufacturer detailing attachment system
installation/attachment.
D.
Structural Calculations: Submit comprehensive analysis of design loads, including dead
loads, live loads, wind loads and thermal movement.
E.
Samples for Initial Selection: Manufacturer’s color charts showing full range of colors
available for units with factory-mixed color finishes.
F.
Samples for Verification: Submit samples for approval. Samples shall be of materials
specified and of suitable size as required to accurately represent each color and texture used
on project. Prepare each sample using same tools and techniques for actual project
application. Maintain and make available, at job site, approved samples.
G.
Material Safety Data Sheets (MSDS) for system components.
H.
Sample Warranty: Submit, for Owner acceptance, manufacturer standard warranty
documents executed by authorized company official.
QUALITY ASSURANCE
A.
Single Source Responsibility: Furnish attachment system components by or under direct
responsibility of same manufacturer.
B.
Manufacturer Qualifications:
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1. Cold formed framing attachment system manufacturer shall have a minimum 5 years
experience manufacturing wall systems similar to those specified. Demonstrate
conformance to testing requirements.
2. Acrylic plaster manufacturer shall have marketed Exterior Insulation and Finish Systems
Coatings in United States for at least ten years.
a. Shall have completed projects of same building size and type as this project.
C.
Installer Qualifications:
1. Approved by manufacturer as qualified installer for work of this Section.
2. Superintendent or foreman overseeing installation on site during work of this Section.
3. Able to document completed projects of equivalent scope and quality upon request by
Architect.
4. Shall have attended a ParexLahabra Educational Seminar for installation of products.
5. Shall possess a current certificate of education.
6. Shall be experienced and competent in installation of plaster-like materials.
D.
Licensed Professionals:
1. Design shall be provided by a professional engineer experienced in the design of curtain
wall systems and licensed in the applicable State.
2. Design of anchors and fasteners for attachment to substrate shall be provided by
professional engineer licensed to practice in the applicable State.
E.
Mock-Ups:
1. Mock up complete system at location as directed by Architect.
2. Provide as required to illustrate substrate, framing, insulation, panel, corner return and
penetrations, and to allow for approval of exterior finishes and aesthetic appearance.
3. Verify mock-up as conforming to manufacturer’s instructions and provisions of Contract
Documents.
4. Do not begin work of this Section until after inspection by manufacturer’s representative
is complete and mock-up has been accepted in writing by Architect.
5. Protect and maintain accepted mock-up as standard of quality for work of this Section.
6. Accepted mock-ups may be incorporated into the work of this Section.
F.
Pre-installation Meeting:
1. Conduct a pre-installation conference prior to commencing related work; conference to
include owner’s representative, project architect, engineer providing curtain wall systems
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design, manufacturer’s engineer or technical representative, general contractor, and
installation subcontractor.
2. Meeting Time: Minimum [2] [3] [4] weeks prior to beginning work of this Section and
related work that may affect work of this Section.
3. Location: Project Site.
1.06
1.07
G.
Field Measurements: Verify actual supporting and adjoining construction before fabrication;
record field measurements on project record shop drawings.
H.
Established Dimensions: Where field measurements cannot be made without delaying work,
guarantee dimensions and proceed with fabrication of wall panel assemblies corresponding to
established dimensions.
DELIVERY, STORAGE AND HANDLING
A.
Ordering: Conform to manufacturer’s ordering instructions and lead time requirements to
avoid construction delays.
B.
Delivery: Deliver materials in manufacturer’s original, unopened, undamaged containers
with identification labels intact.
C.
Store, handle, and protect materials in accordance with manufacturer’s written instructions.
Keep clean and dry, out of sunlight, and protect from damage due to weather and construction
activities. Storage temperatures must be between 40 °F (4 °C) and 110 °F (43 °C).
SITE CONDITIONS
A.
Site Environmental Requirements: Do not install materials unless site conditions are as
recommended in manufacturer’s literature.
1. Installation Ambient Air Temperature: Minimum of 40 °F (4 °C) and rising, and remain
so for 24 hours thereafter.
2. Substrate Temperature: Do not apply Parex materials to substrates whose temperature are
below 40 °F (4 °C) or contain frost or ice.
3. Inclement Weather: Do not apply Parex materials during inclement weather, unless
appropriate protection is employed.
4. Sunlight Exposure: Avoid, when possible, installation of the Parex materials in direct
sunlight. Application of Parex Finishes in direct sunlight in hot weather may adversely
affect aesthetics.
5. Parex materials shall not be applied if ambient temperature exceeds 120 ºF (49 ºC) or
falls below 40 °F (4 °C) within 24 hours of application. Protect base coats from uneven
and excessive evaporation during hot, dry weather.
6. Prior to installation, the wall shall be inspected for surface contamination, or other
defects that may adversely affect the performance of the Parex materials and shall be free
of residual moisture.
1.08
SEQUENCING
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A.
1.09
WARRANTY
PART 2
2.01
Coordinate construction to ensure that wall finish assemblies fit properly to supporting and
adjoining construction; coordinate schedule with construction progress to avoid delaying
work.
A.
Manufacturer: Standard 20-year materials warranty covering defective materials of cold
formed metal framing system.
B.
Manufacturer Coating Performance Warranty: Upon request, at completion of installation,
provide Parex NuTech Stucco Limited Warranty. See Parex’s warranty schedule for available
Parex Warranties or contact a representative.
C.
Contractor: 1-year labor warranty, starting from [date of Owner acceptance of Work]
[Substantial Completion], to cover repair of materials found to be defective due to installation
errors.
PRODUCTS
MANUFACTURERS
A.
Subject to conformance to requirements, provide products manufactured by:
1. Knight Wall, 28308 N. Cedar Road, Deer Park, WA 99006.
a. Knight Wall Systems, SL-PanelTek Rain Screen Leveling System, thermally
insulated and isolated between metal components and substrate.
2. ParexLahabra, Inc., 4125 E. LaPalma Ave., Suite 250, Anaheim, CA 92807.
a. ParexLahabra, Inc, 121 Base Coat, Reinforcing Mesh, Primers & Acrylic Finish.
3. National Gypsum Company, Inc. 2001 Rexford Road, Charlotte, NC 28211.
a. National Gypsum Company, Inc, PermaBase® Brand Cement Board.
B.
2.02
Components: Obtain components of Parex NuTech Stucco from authorized distributors. No
substitutions or additions of other materials are permitted without prior written permission
from ParexLahabra for this project.
MATERIALS
A.
Base Coats:
1. 121 Base Coat: 100% acrylic polymer base, requiring the addition of portland cement.
2. 121 Dry Base Coat: Copolymer based, factory blend of cement and proprietary
ingredients requiring addition of water.
3. 121 Optimum Base Coat: Copolymer based, factory blend of cement and proprietary
ingredients requiring addition of water.
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EDITOR NOTE: RETAIN BELOW STANDARD MESH FOR PAREX NUTECH STUCCO
FOR STANDARD IMPACT RESISTANCE CLASSIFICATION.
B.
Parex Reinforcing Mesh:
1. 355 Standard Mesh: Weight 4.5 oz. per sq. yd. (153 g/sq m); coated for protection against
alkali. Standard reinforcement of Parex NuTech Stucco, or for use with High Impact
358.14 Mesh, or Ultra High Impact 358.20 Mesh.
2. 356 Short Detail Mesh: Reinforcing mesh used for backwrapping and details, and to
embed in and any Parex 121 Base Coat & Adhesive at the joints in Exterior grade
gypsum sheathing.
3. 352 Self Adhesive Detail Mesh: Reinforcing mesh used for complex details and as
reinforcement over Permabase sheathing joints, rough openings and at terminations.
EDITOR NOTE: RETAIN BELOW MESH REQUIREMENTS AFTER DETERMINATION OF
IMPACT RESISTANCE CLASSIFICATION.
4. 358.10 Intermediate Impact 10 Mesh: Weight 12 oz. per sq. yd. (407 g/sq m) Reinforcing
mesh used with Parex NuTech Stucco, to achieve EIMA intermediate impact strength.
5. 358.14 High Impact 14 Mesh: Weight 15 oz. per sq. yd. (509 g/sq m) Reinforcing mesh
used with Parex NuTech Stucco for to achieve EIMA high impact strength.
6. 358.20 Ultra High Impact 20 Mesh: Weight 20 oz. per sq. yd. (678 g/ sq m) Reinforcing
mesh used with Parex NuTech Stucco; to achieve ultra-high impact strength.
7. 357 Corner Mesh: Reinforcing mesh used as corner reinforcement; required with UltraHigh Impact 20 Mesh.
EDITOR NOTE: RETAIN BELOW AND SPECIFY LOCATIONS TO RECEIVE HIGHER
THAN STANDARD IMPACT RESISTANCE CLASSIFICATION.
Locations: __________________; EIMA Impact Classification:_________
C.
Parex Primers:
1. 310 Primer: 100% acrylic based coating to prepare surfaces for Parex finishes.
2. 313 Sanded Primer: 100% acrylic based coating to prepare surface for Parex Cerastone
and Spraystone finishes.
EDITOR NOTE: MODIFY BELOW TO SUIT REQUIREMENTS. CHOOSE ONE #1 FINISH
TYPE
D.
Parex Finish:
1. Parex DPR Optimum Finish: Factory blended, 100% acrylic polymer based finish,
integrally colored. Finish type, texture and color as selected by Architect.
a. Finish type, texture and color as selected by Architect
-OR-
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2. Parex DPR Standard Finish: Factory blended, 100% acrylic polymer based finish,
integrally colored. Finish type, texture and color as selected by Architect.
a. Finish type, texture and color as selected by Architect.
2.03
E.
Water: Clean, cool, potable water
F.
Portland Cement: ASTM C150, Type I or Type I-II. [Dependent upon chosen product]
COLD FORMED METAL FRAMING:
A.
Cold-Formed Steel Framing Members: Conform to ICC ES AC46.
B.
Gauge, Configuration, Dimensions, and Spacing: Minimum 18 gauge and as needed to
conform to design criteria for each assembly.
C.
Hot-Dip Aluminum-Zinc Alloy-Coating: ASTM A792, Commercial Steel (CS), Grade B,
Coating Designation AZ50.
D.
Wall Brackets:
1. Minimum 0.068 inch thick (14 gage) sheet steel.
2. Slots: For anchoring self-drilling [_________] screws [____________] to substrate
3. Threaded Drill Holes: For engaging M8 (8mm) hex head socket screws for use in
attaching vertical girt.
a. Double thickness of bracket metal at of drill-hole locations.
b. Spaced appropriately to maintain proper alignment of vertical girts
4. Dimensions: As needed to offset brackets from wall plane where meeting substrate and to
allow for installation of insulation equal in thickness to offset.
a. Offset Brackets – Minimum 4.7 inch high and 1.5 inch wide
b. Offset Brackets – 2, 3, 4, 5 or 6 inch depth.
1)
E.
Align offsets to differing wall planes as shown on Drawings.
Vertical Girt: Minimum 0.0466-inch thick (18 gauge) cold-formed steel.
1. Nominal Dimensions: 2 inch at sides attaching to wall bracket and 1.2 inch at face.
2. Elongated Slots: 4 inch on center along length of track allowing for aligning and
plumbing of vertical framing, independent of substrate irregularities. Minimum
adjustment 1 inch.
3. Threaded Holes: Locate regularly spaced in vertical girt indented to double thickness of
metal at opening to facilitate M8 screw attachment of horizontal rail.
F.
Horizontal Track: Nominal 0.05466 inch thick (18 gauge) cold formed steel.
1. Dimensions: 1 inch at base and 2 inch high sides.
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2. Weep Drains: Include along base to allow for drainage.
3. Attachment Slots: Locate at 8 inches on center along back to facilitate M8 screw
attachment to vertical L track.
4. Access Openings: Locate larger openings in front of track for access and to facilitate
insertion of screws.
2.04
ACCESSORIES
A.
Cold Formed Framing Thermal Barrier
1. Material: Injection molded polyacetal cold-polymer
2. Size:
a. Washer Isolation: Designed to thermally isolate fastener heads from metal, minimum
0.125 inch thick
b. Framing member to framing member isolation: minimum 0.125 inch thick
c. Support wall isolation: minimum 0.60 inch thick
B.
Connectors used with Cold-Formed Steel Framing Members: Conform to ICC ES AC261
C.
Screw Fasteners: Stainless steel as instructed by panel manufacturer.
1. Socket Screws: M8, hex socket head, stainless steel, for attachment of horizontal rail to
vertical girt, vertical girt to wall bracket and as instructed by manufacturer.
2. Steel Screws: No. 14, hex-head screws, and washers for attaching wall bracket into steel
stud framed wall assemblies with minimum 3/8 inch penetration into steel stud members.
a. Steel Tapping Screws: ASTM C1513.
b. Steel Drill Screws: ASTM C954.
D.
Concrete and Masonry Wall Anchors: Mechanical and Adhesive anchors, bolts, nuts, and
washers suited to use and as required for transference of design loads.
1. Mechanical Anchors: Expansion type, conforming to ICC ES AC193.
2. Adhesive Anchors: Torque Controlled, conforming to ICC ES AC308
E.
Flashing: 0.032 prefinished aluminum, matching panel finish where exposed. Secure using
concealed fasteners.
F.
Cement Board
1. Minimum 5/8 inch (16 mm) thick PermaBase® Brand Cement Board complying with
ASTM C 1325
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2. Accessories: Casing beads, expansion and control joints of exterior grade, rigid PVC in
accordance with ASTM D1784 and ASTM D4216, as manufactured by Vinyl Corp. or
Plastic Components, Inc
G.
Sealant System:
1. Sealant for perimeter seals around window and door frames and other wall penetrations
shall be low modulus, designed for minimum 50% elongation and minimum 25%
compression, and as selected by Architect.
2. Sealants shall conform to ASTM C920, Grade NS.
3. Perimeter seal joints shall be a minimum width of 1/2 in (12.7 mm).
4. Sealant backer rod shall be closed-cell polyethylene foam.
5. Apply sealant to tracks or base coat.
6. Refer to ParexLahabra current bulletin for listing of sealants which have been tested and
have been found to be compatible with Parex
7. Color shall be as selected by Architect.
8. Joint design, surface preparation, and sealant primer shall be based on sealant
manufacturer's recommendations and project conditions.
H.
PART 3
3.01
3.02
Bracing, Furring, Bridging, Plates, Gussets, and Clips: Formed sheet steel, thickness as
necessary to meet structural requirements for conditions encountered.
EXECUTION
EXAMINATION
A.
Verify conditions ready to receive work of this Section before beginning.
B.
Substructure: Verify level and plumb, free of defects detrimental to work and erected in
conformance with established building tolerances.
C.
Water-Resistant Barrier (WRB): Installed in conformance with WRB manufacturer’s
instructions. Verify discontinuities in WRB properly flashed and sealed.
D.
Protection: Protect surrounding material surfaces and areas during installation of system.
E.
Clean surfaces thoroughly prior to installation.
F.
Prepare surfaces using the methods recommended by the Manufacturer for achieving the best
result for the substrate under the project conditions.
MIXING
A.
Mix Parex proprietary products in accordance with Manufacturer's instructions.
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3.03
INSTALLATION
A.
General: Installation shall conform to this specification and ParexLahabra written instructions
and drawing details.
B.
Cold-Formed Metal Framing:
1. Use a laser or chalk line to mark starting height of wall brackets (~20” above grade).
2. Mount starting height wall brackets at 16 or 24 inches on center (as determined by the
engineer of record) using a minimum of two self-tapping screws, as indicated on shop
drawings.
3. Simultaneously install the vertical ‘L’ track and wall brackets (at intervals determined by
the EOR) to the height of the curtain–wall.
a. Check plumb of vertical track both parallel and perpendicular to the structure. Use
slots in track to insure parallel alignment of face of framing.
b. Tighten all M8 hex socket screws that attach the vertical track to the wall brackets to
125 in/lbs of torque. If installed using hand tools, verify for each installer at
beginning of project using snug tight criteria.
c. Where vertical obstructions are present and unavoidable (i.e. window openings), use
laser or chalk line to restart vertical girt, ensuring horizontal alignment of screw holes
for horizontal track.
4. Install all specified insulation in the spaces between the ‘L’ track prior to the installation
of the horizontal mounting track.
5. Mount lowest (first) horizontal track to lowest holes in vertical track using M8 screws.
Install next horizontal track appropriately above the lowest (first) horizontal track, as
indicated on shop drawings, such that a bearing surface will be created for proper cement
board attachment and the successive cement board above may be attached. Tighten so
screw heads shall be driven flush with face of the cement board.
a. Install successive horizontal tracks such that cement board does not span greater than
600mm (~23 3/8”).
b. When encountering windows and other openings, mount horizontal track so that
fastening points are as close to the lower and upper edges of windows and other
openings as possible.
C.
Cement Board
1. The cement board shall be installed in accordance with this specification and the cement
board manufacturer’s written instructions.
2. Cement board shall be fastened to framing by corrosion resistant steel screws.
3. Locate screws 8" (20.4 m) maximum on center along framing members or closer as
required by design loads. Screws at board edges shall be placed 3/8" (0.95 m) in from the
edge. Fastener heads are to be driven flush with the face of the cement board.
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4. All vertical joints of the cement board shall be staggered in a running bond pattern and
terminate on framing. All cement board joints shall be butted together.
5. Offset horizontal cement board joints a minimum of 12" (300 mm) from horizontal
sheathing joints. Offset vertical cement board joints a minimum of one stud space from
vertical sheathing joints.
6. Offset cement board joints a minimum of 8" (203 m) from the corners of openings by "L"
cutting the cement board around corners of openings
D.
Joint Treatment:
1. Embed Parex Short Detail Fiberglass Mesh 356 or 352 Self Adhesive Detail Mesh in any
Parex 121 Base Coat & Adhesive centered over all cement board joints, inside and
outside corners, and as diagonal "butterflies" at corners of openings. Optional: Embed
Parex Corner Mesh 357 and any Parex 121 Base Coat & Adhesive in at outside corners in
place of Short Detail Mesh.
2. Optional Insulation Board Trim and Features: Apply Parex Adhesive to the entire back
surface of the insulation board with a Parex notched trowel. Press and slide insulation
board into place for continuous adhesion.
3.
Using a stainless steel trowel, apply Base Coat approximately 1/16" (1.6 mm) thick to
the entire cement board and insulation board exposed surfaces, including previously
meshed joints and corners. Lap mesh joints 2 1/2" (64 mm) minimum.
4. Apply diagonal mesh "butterflies" to corners of insulation board bands that surround
openings. Embed Parex Standard Mesh 355 into the wet base coat on the entire base
coated surface. Apply additional base coat if required to ensure mesh is completely
embedded and to achieve a final nominal thickness of 1/16" (1.6 mm). The mesh shall not
be visible and shall show no texture.
5. Where indicated on the drawings, install Parex Mesh 358.10 for additional impact
resistance. Follow Parex Product Data Sheet application details for mesh installation.
6. After the base coat has dried a minimum of 24 hours or longer as required by conditions,
the surface shall be examined for any irregularities. The base coat shall have a smooth
and continuous texture prior to proceeding to primer and finish coat application. Correct
any irregularities to produce a flat surface. Base Coat: Apply base coat and fully embed
mesh in base coat; include diagonal mesh patches at corners of openings and reinforcing
mesh patches at joints of track sections. Apply multiple layers of base coat and mesh
where required for specified impact resistance classification.
E.
Bond supplemental EPS shapes as indicated on the drawings. Bond shapes to EPS or to dry
reinforced base coat using any Parex 121 Base Coat & Adhesive as an adhesive. Allow 24
hours to dry.
F.
Apply optional primer to base coat after drying. Primer may be omitted if it is not required by
the Manufacturer's product data sheets for the specified finish coat or otherwise specified for
the project.
G.
Finish Coat: Apply finish coat to match specified finish type, texture, and color. Do not apply
finish coat to surfaces to receive sealant. Keep finish out of sealant joint gaps.
09-07-10
KWS SL-PanelTek™/Parex NuTech Stucco
07 42 63 - 13
Cold Formed Framing
Acrylic Plastering
3.04
FIELD QUALITY CONTROL
A.
3.05
3.06
Prior to cement board installation, perform a visual survey of the wall brackets, vertical and
horizontal framing components. Spot-check torque on M8 hex socket screws and confirm
plumb of framing members.
CLEANING
A.
Removal: Remove and legally dispose of Parex NuTech Stucco component debris material
from job site.
B.
Clean Coating surfaces and work area of foreign materials resulting from installation.
PROTECTION
A.
Provide protection of installed materials from water infiltration into or behind them.
B.
Provide protection of installed stucco from dust, dirt, precipitation, and freezing during
installation.
C.
Provide protection of installed finish from dust, dirt, precipitation, freezing and continuous
high humidity until fully cured and dry.
D.
Clean exposed surfaces using materials and methods recommended by the manufacturer of
the material or product being cleaned. Remove and replace work that cannot be cleaned to the
satisfaction of the Architect/Owner.
END OF SECTION
09-07-10
KWS SL-PanelTek™/Parex NuTech Stucco
07 42 63 - 14
Cold Formed Framing
Acrylic Plastering