United States Gypsum Company (USG)
Tremco Commercial Sealants and Waterproofing
SECTION 07 27 23 - BOARD PRODUCT AIR BARRIERS
Guide Specification
Specifier: This guide specification section specifies Securock ExoAir 430 fluid-applied, synthetic semipermeable, class III vapor retarder membrane-type air barrier. ExoAir 430 membrane is factory fluidapplied to USG’s Securock Glass-Mat Sheathing substrate. Typical membrane-type air barriers are a
minimum of 35 mils thick; Securock ExoAir 430 is factory-fluid applied 20 mils thick as it is able to meet
all industry testing standards due to factory-based quality control when compared to field application
variability. Used in conjunction with accessory components, the system provides significant elastomeric
qualities that protect against failure resulting from long-term wall assembly differential movement.
Specifier: This guide specification section specifies a board product air barrier consisting of USG
Securock® glass-mat gypsum sheathing with a factory-applied ExoAir® 430 semi-permeable, class III
vapor retarder membrane-type air barrier and jobsite-finished joints and transitions, providing a one-step
installation, high-quality, consistent air barrier treatment for frame walls.
To provide further assurance of protection, USG and Tremco have gone beyond traditional manufacturer
testing and performed testing on related components that connect to the Securock ExoAir 430, including
ExoAir 230, Proglaze® ETA Connections and Tremco sealants. When used with accessory components
including ExoAir 111 Self-Adhered Air & Vapor Membrane, ExoAir Primer, Tremco Epoxy Primer,
Spectrem® 1, Dymonic® 100, ExoAir LEF, Securock ExoAir Reinforcing Mesh or Proglaze ETA
Connections as a comprehensive system, continuity and long-term performance is assured.
ExoAir 430 is a factory fluid-applied, synthetic semi-permeable, class III vapor retarder air barrier
designed for use in commercial construction application. It is formulated to include UV resistance,
providing the flexibility to install rainscreen systems with open joints or to allow the membrane to be
exposed during the construction process. It also withstands temperatures up to 240°F (115°C) and ASTM
E 84 testing for flame spread and smoke development shows it contributes to life safety issues.
Securock ExoAir 430 panel is approved as a component in wall assemblies tested for compliance with
NFPA 285; contact Tremco for test details.
This section is readily edited utilizing several common commercial specification software tools.
For specification assistance, please email USG4YOUtechnicalsupport@usg.com and you will be contacted
by a USG and/or Tremco Technical Representative.
ExoAir®, Spectrem®, Dymonic®, and Proglaze® are registered trademarks of Tremco, Inc.
Securock® is a registered trademark of United States Gypsum Company.
GREENGUARD® is a registered trademark of UL LLC.
This document is Copyright© 2015 by United States Gypsum Company and Tremco, Inc.
SECTION 07 27 23 - BOARD PRODUCT AIR BARRIERS
GENERAL
1.1
SUMMARY
A.
Section includes glass-mat gypsum sheathing product with factory-applied air barrier membrane
and the following:
1.
2.
Site-fluid-applied, vapor-permeable membrane air barrier.
Air barrier accessory materials.
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BOARD PRODUCT AIR BARRIERS
1.2
RELATED REQUIREMENTS
Specifier: If retaining this optional Related Requirements Article, edit to include only those
sections included in project manual.
A.
B.
C.
D.
E.
F.
G.
1.3
Division 01 Section "Sustainable Design Requirements" for additional requirements,
including [LEED] documentation requirements.
Section 04 20 00 "Unit Masonry" for flexible flashing components integrating with
transition materials specified in this Section.
Section 04 21 13 "Brick Masonry" for flexible flashing components integrating with
transition materials specified in this Section.
[Section 06 16 00 "Sheathing"] [Section 06 16 43 "Gypsum Sheathing"] for wall
sheathing requirements for portions of the Work not requiring board product air barriers
specified in this Section.
Division 07 air barrier section for air barrier applications over other backup materials, for
single-source and compatibility requirements and warranty requirements specified in this
Section.
Division 07 roofing Sections for roof assembly air barriers and interface coordination.
Division 08 exterior openings sections for framing for [aluminum-framed entrances and
storefronts] [aluminum windows] [glazed aluminum curtain walls] [louvers and vents]
receiving air barrier transition assembly specified in this Section.
REFERENCES
Specifier: If retaining this optional References Article, edit to include only those references
cited in the edited section.
A.
References, General: Versions of the following standards current as of the date of issue of the
project apply to the Work of this Section.
B.
ASTM International (ASTM): www.astm.org:
1.
ASTM C 297 – Standard Test Method for Flatwise Tensile Bond Strength of Sandwich
Construction
2.
ASTM C 518 – Standard Test Method for Steady-state Thermal Transmission Properties
by Means of the Heat Flow Meter Apparatus
3.
ASTM C 794 – Standard Test Method for Adhesion-in-Peel of Elastomeric Joint Sealants
4.
ASTM C 920 – Standard Specification for Elastomeric Joint Sealants
5.
ASTM C 1002 - Standard Specification for Steel Self-Piercing Tapping Screw for the
Application of Gypsum Panel Products or Metal Plaster Bases to Wood Studs or Steel
Studs
6.
ASTM C 1177/C 1177M - Specification for Glass Mat Gypsum Substrate for Use as
Sheathing
7.
ASTM C 1193 - Guide for Use of Joint Sealants
8.
ASTM C 1280 - Standard Specification for Application of Exterior Gypsum Panel
Products for Use as Sheathing
9.
ASTM C 1305 – Standard Test Method for Crack Bridging Ability of Liquid Applied
Waterproofing Membranes
10.
ASTM D 412 - Standard Test Methods for Vulcanized Rubber and Thermoplastic
Elastomers – Tension
11.
ASTM D 1970 – Standard Specification for Self-Adhering Polymer Modified Bituminous
Sheet Material Used As Steep Roofing Underlayment for Ice Dam Protection
12.
ASTM D 3273 – Standard Test Methods for Resistance to Growth of Mold on the Surface
of Interior Coatings in an Environmental Chamber
13.
ASTM D 3330 – Standard Test Method for Peel Adhesion of Pressure-Sensitive Tape
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BOARD PRODUCT AIR BARRIERS
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
C.
Gypsum Association (GA): www.gypsum.org:
1.
D.
NFPA 285 - Standard Fire Test Method For Evaluation Of Fire Propagation
Characteristics Of Exterior Non-Load-Bearing Wall Assemblies Containing Combustible
Components
US Green Building Council (USGBC): www.usgbc.org:
1.
1.4
GA-253 – Application of Gypsum Sheathing
National Fire Protection Association (NFPA): www.nfpa.org:
1.
E.
ASTM D 4541 – Standard Test Method for Pull-Off Strength of Coatings Using Portable
Adhesion Testers
ASTM E 84 - Standard Test Method for Surface Burning Characteristics of Building
Materials
ASTM E 96/E 96M - Standard Test Methods for Water Vapor Transmission of Materials
ASTM E 119 – Standard Test Method for Fire Tests for Building Construction and
Materials
ASTM E 136 – Standard Test Method of Behavior of Materials in a Vertical Tube Furnace
at 75°C
ASTM E 331 – Standard Test Method for Water Penetration of Exterior Windows,
Skylight, Doors, and Curtainwalls by Uniform Static Air Pressure Difference
ASTM E 831 – Standard Test Method for Linear Thermal Expansion of Solid Materials by
Thermomechanical Analysis
ASTM E 783 - Standard Test Method for Field Measurement of Air Leakage through
Installed Exterior Windows and Doors
ASTM E 1186 - Practices for Air Leakage Site Detection in Building Envelopes and Air
Barrier Systems
ASTM E 2178 - Standard Test Method for Air Permeance of Building Materials
ASTM E 2357 - Standard Test Method for Determining Air Leakage of Air Barrier
Assemblies
ASTM E 2485 - Standard Test Method for Freeze-Thaw Resistance of Exterior Insulation
and Finish Systems (EIF) and Water Resistive Barrier Coatings
Leadership in Energy and Environmental Design (LEED) Green Building Rating System.
ADMINISTRATIVE REQUIREMENTS
A.
Coordination: Coordinate installation of board product air barriers with framing installation and
subsequent operations that may impact finished air barrier work.
B.
Coordination: Coordinate installation of joint sealants with cleaning of joint sealant substrates
and other operations that may impact installation or finished joint sealant work.
C.
Preinstallation Conference: Conduct conference at Project Site.
1.
2.
Review board product air barrier and air-barrier accessory materials installation, including
joints between panels and transitions to abutting construction, including air barriers
applied to other substrates under work of other Sections. Review requirements for
forming and sealing penetrations of air barrier by other trades.
Review requirements for each type of air barrier product and installation, project and
manufacturer's details, mockups, testing and inspection requirements, and coordination
and sequencing of air barrier work with work of other Sections.
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BOARD PRODUCT AIR BARRIERS
3.
1.5
Review manufacturer's instructions for meeting Project requirements for substrates
specified, including three-dimensional video model demonstrating proper application of
components at wall openings.
ACTION SUBMITTALS
A.
Product Data: For each type of air barrier product, including:
1.
2.
3.
4.
Framing preparation instructions and recommendations.
Substrate preparation instructions and recommendations.
Air barrier system product data, including membrane, transitions, sealants, and
accessories. Include preparation and treatment requirements for transition substrates,
and compatibility information.
Standard drawings illustrating manufacturer's written installation and finishing instructions
applicable to Project, including details for joints, counterflashings, penetrations,
terminations, and tie-ins to adjacent construction.
a.
b.
B.
Illustrate interfaces with other work that forms part of air barrier to demonstrate
continuity.
Where standard drawings do not address Project conditions, provide shop
drawings prepared for Project to illustrate proposed construction.
LEED Submittals:
Specifier: Retain subparagraph below for LEED-NC Credit EQ 4.1 Low-Emitting Materials,
applying to materials located inside the building primary weather barrier.
1.
1.6
Product Data for Credit IEQ 4.2 Low-Emitting Materials – Paints and Coatings: For air
barrier products; provide statement of VOC content.
INFORMATIONAL SUBMITTALS
A.
Qualifications: For Installer, [Testing Agency,] and Manufacturer.
B.
Manufacturer Product Certificates: Indicating compliance with requirements of specified under
Performance Requirements or indicated on Drawings.
Specifier: Retain "Fire Propagations Characteristics Certificate" Paragraph if air barrier is part of
a wall assembly required to comply with NFPA 285.
C.
Fire Propagation Characteristics Certificate: From a qualified testing agency, documentation
that air barrier system as a component of a wall assembly has been tested and passed NFPA
285. Include system classification number of testing agency on shop drawings.
D.
Product Test Reports: Test data for air barrier products and air barrier assembly, by qualified
testing agency, indicating proposed membrane air barrier meets performance requirements,
when requested by Architect.
E.
Warranty: Sample of unexecuted manufacturer warranty.
F.
Field quality control reports.
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BOARD PRODUCT AIR BARRIERS
1.7
QUALITY ASSURANCE
A.
B.
C.
Installer Qualifications: An experienced Installer approved by manufacturer and employing
applicators trained in application of specified products.
Air Barrier Membrane Manufacturer Qualifications: A qualified air barrier membrane
manufacturer with minimum five years' experience in manufacture of air barrier membrane as
one of its principal products.
Single Source Responsibility: Provide air barrier products by a single manufacturer responsible
for testing of Project substrates to verify compatibility of air barrier materials.
Specifier: Retain "Testing Agency Qualifications" Paragraph if Contractor is required to provide
independent inspections under Part 3 Field Quality Control article.
D.
Testing Agency Qualifications: Qualified independent agency experienced in the installation of
the specified waterproofing system, and qualified to perform observation and inspection
specified in Field Quality Control Article to determine Installer’s compliance with the
requirements of this Project, acceptable to Architect, retained by the Contractor.
E.
Mockups: Provide air barrier mockup application within mockups required in other sections, or
if not specified, in an area of not less than 150 sq. ft. (14 sq. m) of wall surface where directed
by Architect for each type of backup wall construction. Include examples of surface
preparation, crack and joint treatment, air barrier application, and flashing, transition, and
termination conditions, to set quality standards for execution.
1.
1.8
Include intersection of wall air barrier with roof air barrier and with foundation wall
intersection.
DELIVERY, STORAGE AND HANDLING
A.
Deliver materials in their original, unopened packaging and store in an enclosed shelter
providing protection from damage and exposure to the elements. Store within temperature limits
required by manufacturer. Store board air barrier flat. Comply with manufacturer’s requirements
for safety and handling.
B.
Discard liquid materials that cannot be applied within their stated shelf life.
C.
Store accessory materials in a location with an ambient temperature of 50 to 80 deg. F (15 to 27
deg. C).
Specifier: Retain first option in "Construction Waste" Paragraph below for LEED projects; retain
second option for other projects.
D.
1.9
Construction Waste: Store and dispose of packaging materials and construction waste in
accordance with requirements of Division 01 Section "Construction Waste Management" or
"Temporary Facilities and Controls."
ENVIRONMENTAL REQUIREMENTS
A.
Cold Weather:
1.
Factory fluid-applied, semi-permeable, class III vapor retarder membrane on a glass-mat
gypsum sheathing panels: Comply with manufacturer’s cold weather application
instructions
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BOARD PRODUCT AIR BARRIERS
2.
Site fluid-applied, vapor-permeable membrane: Comply with manufacturer's cold weather
application instructions when atmospheric temperatures or substrate surface
temperatures are less than 40 deg. F (4 deg. C).
a.
b.
3.
Protect adjacent substrates from environmental conditions that affect air-barrier
performance
Do not apply air barrier to a damp or wet substrate or during snow, rain, fog or
mist
Accessories and sealants: Comply with manufacturer’s cold weather application
instructions when atmospheric temperatures or substrate surface temperatures are less
than 40 deg. F (4 deg. C).
B.
Do not apply site fluid-applied air barrier to a damp or wet substrate or during snow, rain, fog, or
mist.
C.
Exposure: Comply with manufacturer’s limitations on exposure of applied product.
1.10
SCHEDULING
A.
Coordinate installation of membrane air barrier with completion of roofing, below grade, factory
fluid-applied membrane portion to site fluid-applied membrane portion and other work requiring
interface with air barrier.
B.
Schedule work so air barrier applications may be inspected prior to concealment.
C.
Ensure air barrier materials are cured before covering with other materials.
1.11
A.
WARRANTY
Manufacturer's Warranty, Factory Fluid-Applied Air Barrier Products: Manufacturer’s standard
form in which factory fluid-applied air barrier manufacturer agrees to replace any
nonconforming product or refund the purchase price of the quality of product shown to be
nonconforming.
1.
Warranty Period for Air Barrier Panel: 5 years date of Substantial Completion.
Specifier: Consult Tremco representative for available special project warranty terms and
conditions.
B.
Manufacturer's Warranty, Site Fluid-Applied Air Barrier Products: Manufacturer's standard form
in which site fluid-applied air barrier manufacturer agrees to furnish and install air barrier
material to repair or replace those materials installed according to manufacturer's written
instructions that exhibit material defects or otherwise fail to perform as specified under normal
use within warranty period specified.
1.
2.
3.
C.
Access for Repair: Owner shall provide unimpeded access to the Project and the air
barrier system for purposes of testing, leak investigation, and repair, and shall reinstall
removed cladding materials upon completion of repair.
The Manufacturer will, at its option, replace any nonconforming Product or refund the
purchase price of the quantity of Product shown to be nonconforming.
Warranty Period: [5] years date of Substantial Completion.
Manufacturer warranties specified in this article exclude deterioration or failure of air barrier
materials from the following:
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BOARD PRODUCT AIR BARRIERS
1.
2.
Movement of the structure caused by structural settlement or stresses on the air barrier
exceeding manufacturer's written specifications for elongation.
Mechanical damage caused by outside agents.
PRODUCTS
1.12
A.
MANUFACTURERS
Basis-of-Design Product: Provide factory fluid-applied air barrier manufactured by United
States Gypsum Company, Chicago IL; (800) 874-4968;usg_webmaster@usg.com;
www.usg.com; and Tremco, Inc., Commercial Sealants and Waterproofing Division, An
RPM Company, Beachwood OH; (866) 209-2404; techresources@tremcoinc.com;
www.tremcosealants.com.
Specifier: Retain option for substitutions below and edit if required for project.
B.
1.13
A.
Basis-of-Design Products: Provide site fluid-applied air barrier products manufactured by
Tremco, Inc., Commercial Sealants and Waterproofing Division, An RPM Company,
Beachwood
OH;
(866) 321-6357;
email:
techresources@tremcoinc.com;
www.tremcosealants.com, [or comparable products of other manufacturer approved by
Architect in accordance with Instructions to Bidders and Division 01 General Requirements].
MATERIALS, GENERAL
Source Limitations: Obtain air-barrier materials from single source.
Specifier: Paragraph and related subparagraphs below apply to LEED-NC, LEED-CI, and LEEDCS Credit IEQ 4.1, when applications affect air quality on inside of building weather barrier.
Verify additional limitations on VOCs of authorities having jurisdiction.
B.
VOC Content: Provide coatings and sealants complying with the following VOC content limits
per 40 CFR 59, Subpart D (EPA Method 24):
1.
2.
C.
1.14
Architectural Sealants: 250 g/L.
Coatings: VOC not more than 50 g/L.
Compatibility: Provide membrane air barrier materials that are compatible with one another and
with adjacent materials under conditions of service and application required, as demonstrated
by membrane air barrier manufacturer based on testing and field experience.
PERFORMANCE REQUIREMENTS
A.
General: Provide air barrier system consisting of gypsum board wall sheathing with factory fluidapplied air barrier panel and air barrier assembly components that performs as a continuous air
barrier system and as a water-resistive barrier flashed to direct incidental water to wall exterior,
with capability of accommodating normal building movement, material transitions, penetrations,
and interface with adjacent building air barrier system components.
B.
Air Barrier Assembly Air Leakage, ASTM E 2357: Not greater than 0.004 cfm/sq. ft. of surface
area at 1.57 lbf/sq. ft. (0.2 L/s x sq. m of surface area at 75 Pa).
C.
Water Penetration, ASTM E 331: No evidence of water penetration at 6.24 lbf/sq. ft. (300 Pa).
D.
Surface Burning Characteristics, Membrane, ASTM E 84:
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BOARD PRODUCT AIR BARRIERS
1.
2.
Flame spread: Not greater than 25.
Smoke developed: Not greater than 50.
Specifier: Retain "Assembly Combustion Characteristics" paragraph below for projects that
require wall assemblies to comply with NFPA 285. Consult Tremco representative for details of
tested systems.
E.
1.15
A.
Fire Propagation Characteristics: Provide air barrier system qualified as a component of a
comparable wall assembly that has been tested and passed NFPA 285.
BOARD PRODUCT AIR BARRIER SYSTEM
Air Barrier Sheathing and Factory Fluid-Applied Membrane: Glass-mat-faced gypsum sheathing
panel, ASTM C 1177/1177M, with elastomeric, UV-resistant synthetic polymer membrane
applied at not less than 20 mils (0.5 mm) DFT.
1.
2.
1.16
Basis of Design Product: United States Gypsum Company and Tremco Incorporated,
Securock ExoAir 430 Panel.
Physical and Performance Properties:
a.
Board Product Type and Thickness: Type X, 5/8 inch (17.7 mm) thick, with square
edge.
b.
Board Product Antifungal Properties: ASTM D 3273: Not less than 10.
c.
Air Permeance, ASTM E 2178: 0.004 cfm/sq. ft of surface area at 1.57-lbf/sq. ft.
(0.02 L/s x sq. m of surface area at 75-Pa) pressure difference, maximum.
d.
Vapor Permeance, ASTM E 96/E96M, Method B: Greater than 1.0, less than 10
perms (690 ng/Pa x s x sq. m).
e.
Combustion Characteristics, ASTM E 84: Class A, flame spread, not greater than
25; smoke developed, not greater than 450.
f.
VOC Content: Less than 50 g/L.
g.
Membrane Color: Bright Orange
AIR BARRIER ACCESSORY MATERIALS
A.
General: Provide compatible air barrier accessory materials furnished or recommended by air
barrier manufacturer as required by Project conditions to produce a complete air barrier
assembly identical to tested assemblies meeting performance requirements.
B.
Primer: Liquid primer recommended by air barrier manufacturer for substrates requiring field
application of air barrier materials.
1.
C.
D.
Basis of Design Product: Tremco, Inc., ExoAir Primer and Tremco, Inc., Tremco
Epoxy Primer.
Fluid-Applied Air Barrier Membrane: Site-applied synthetic polymer membrane for application to
adjacent substrates, detailing, and repairs.
1.
Basis of Design Product: Tremco, Inc., ExoAir 230.
2.
Color: Light Orange
High-temperature and low temperature Flashing and Transition Strip: Self-adhering strip 24
mils (0.61) mm) thick, consisting of butyl laminated to an aluminized facer with release liner.
1.
Basis of Design Product: Tremco, Inc., ExoAir 111.
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BOARD PRODUCT AIR BARRIERS
Specifier: Tremco Proglaze® ETA is a transition assembly composed of pre-engineered,
finished aluminum and silicone materials that are mechanically attached to the window and/or
wall’s structural framing to insure a durable connection and seal. The system’s design absorbs
thermal movement and wind-loading stresses. If required for Project, specify in this Section, or
in Division 08 openings sections.
A.
Wall Opening Transition Assembly: Cured low-modulus extruded silicone sheet, with reinforcing
ribs, sized to fit opening widths, with aluminum race configured for insertion into aluminum
framing extrusions, compatible with specified silicone joint sealant and fluid-applied membrane
air barrier.
1.
B.
Wall Opening Transition Sheet: Cured low-modulus extruded silicone sheet, compatible with
specified silicone sealant and fluid-applied membrane air barrier.
1.
C.
4.
A.
Basis of Design Product: Tremco, Inc., Dymonic 100.
Volatile Organic Compound (VOC) Content: 40 g/L maximum.
Volatile Organic Emissions (VOE): Not greater than Greenguard Children & Schools
Certification emissions levels.
Color: Light Orange
Sprayed Polyurethane Foam Sealant: One- component, moisture-curing,
polyurethane foam sealant, movement range of not less than +/- 15 percent.
1.
1.17
Basis of Design Product: Tremco, Inc., Spectrem 1.
Volatile Organic Compound (VOC) Content: 1 g/L maximum.
Volatile Organic Emissions (VOE): Not greater than Greenguard Children & Schools
Certification emissions levels.
Joint Sealant for Exposed or Concealed Air Barrier Components: Single-Component, Nonsag,
Moisture-Cure, Polyurethane Joint Sealant: ASTM C920, Type S, Grade NS, Class 100/50,
Use NT; SWRI validated.
1.
2.
3.
F.
Basis of Design Product: Securock ExoAir Reinforcing Mesh.
Joint Sealant for Exposed Air Barrier Components: Single-Component, Nonsag, Non-Staining,
Neutral-Curing Silicone Joint Sealant: ASTM C 920, Type S, Grade NS, Class 100/50, Use NT;
SWRI validated.
1.
2.
3.
E.
Basis of Design Product: Tremco, Inc., Proglaze ETA Connections Single-Ribbed
Sheet.
Reinforcing Mesh: Self-adhering fiberglass mesh, not less than 2 inches (50 mm) wide.
1.
D.
Basis of Design Product: Tremco, Inc., Proglaze ETA Engineered Transition
Assembly.
gun-grade,
Basis of Design Product: Tremco, Inc., ExoAir Flex Foam.
FASTENERS
Screws for Fastening Board Product Air Barriers to Cold-Formed Metal Framing: Steel drill
screws, ASTM C 1002, in length recommended by sheathing manufacturer for sheathing
thickness, with organic-polymer corrosion-protective coating having a salt-spray resistance of
more than 800 hours according to ASTM B 117.
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BOARD PRODUCT AIR BARRIERS
B.
Screws for Fastening Board Product Air Barriers to Wood Framing: Wood screws,
ASTM C 1002, in length recommended by sheathing manufacturer for sheathing thickness, with
organic-polymer corrosion-protective coating having a salt-spray resistance of more than 800
hours according to ASTM B 117.
EXECUTION
1.18
EXAMINATION
A.
Framing Examination: Examine framing to determine if work is ready to receive board product
air barriers. Verify surface flatness tolerances and framing spacing comply with Project
requirements [including approved shop drawings]. Verify panels will be adequately supported on
indicated edges. Proceed with work once conditions meet manufacturer's written
recommendations.
B.
Adjacent Substrate Examination: Prior to installation of accessory materials, examine adjacent
substrates to receive transition treatment as part of the Work of this Section. Verify that
substrates are sound and free of contaminants, are adequately cured or aged, are compatible
with proposed transition materials, and are free of obstructions or impediments that would result
in failure of transition adhesion and failure of air barrier assembly to perform in accordance with
Project requirements. Proceed with work once conditions meet manufacturer's written
recommendations.
1.
2.
C.
1.19
Verify concrete and masonry surfaces are visibly dry, have cured, and are free from
release agents, curing agents, and other contaminates. Test for capillary moisture by
plastic sheet method according to ASTM D 4263.
Verify masonry joints are filled with mortar and struck flush.
Proceed with installation once conditions meet manufacturer's written recommendations and
after unsatisfactory conditions have been corrected.
INTERFACE WITH OTHER WORK
A.
Commencement of Work: Commence work once air barrier substrates are adequately
protected from weather and will remain protected during remainder of construction.
B.
Sequencing of Work: Coordinate sequencing of air barrier work with work of other sections
that form portions of building envelope air barrier to ensure that flashings and transition
materials can be properly installed and inspected.
C.
Subsequent Work: Coordinate air barrier work with work of other sections installed subsequent
to air barrier to ensure complete inspection of installed air barrier and sealing of air barrier
penetrations necessitated by subsequent work.
1.20
A.
PREPARATION
Clean, prepare, and treat portions of work not requiring gypsum sheathing substrate in
accordance with air barrier manufacturer's written instructions.
1.
2.
3.
4.
Mask adjacent finished surfaces.
Remove contaminants and film-forming coatings from substrates.
Remove projections and excess materials and fill voids with substrate patching material.
Prepare and treat joints and cracks in substrate per ASTM C 1193 and membrane air
barrier manufacturer's written instructions.
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BOARD PRODUCT AIR BARRIERS
1.21
A.
INSTALLATION OF FACTORY FLUID-APPLIED AIR BARRIER PANELS
Discard factory fluid-applied air barrier panels with damage that compromises membrane
continuity or impairs performance as an air barrier, and is unable to be repaired according to
manufacturer’s repair instructions. Apply panels in pieces sized to provide minimum number of
joints and optimum panel arrangement.
B.
Coordinate panel installation with air barrier accessory materials installation so materials are
installed in proper sequence and manner that prevents exterior moisture from penetrating
completed assembly.
C.
Do not allow panels to bridge building expansion joints; cut and space edges of panels to match
spacing of structural support elements.
D.
Comply with ASTM C 1280, GA-253, and manufacturer's written instructions.
1.
2.
3.
Fasten panels to wood framing with specified screws in pattern indicated.
Fasten panels to cold-formed metal framing with specified screws in pattern indicated.
Install panels with a 1/4-inch (6.4 mm) gap where panels abut masonry or similar
materials that might retain and transmit moisture to panels.
E.
Cut panels at penetrations, edges, and other obstructions of work to allow for application of air
barrier accessory materials. Fit panels closely against abutting construction.
F.
Apply fasteners so heads are seated flush to the board product air barrier membrane surface
without breaking or punching through the surface.
G.
Install panels with long dimension perpendicular or parallel to framing. Abut ends and edges of
panels centered over face of framing members. Offset panel joints by not less than one stud
spacing.
1.
1.22
Space fasteners maximum 8 inches (203 mm) o.c. and set back a minimum of 3/8 inch
(905 mm) from edges and ends of panels and as required in indicated fire-resistancerated designs.
INSTALLATION OF SITE FLUID-APPLIED AIR-BARRIER MEMBRANE
A.
General: Apply site fluid-applied fluid air-barrier material at non-sheathed substrates to form a
seal with strips and transition strips and to achieve a continuous air barrier according to airbarrier manufacturer's written instructions. Apply site fluid-applied fluid air-barrier material
within manufacturer's recommended application temperature ranges.
B.
Membrane Air Barrier: Apply site fluid-applied fluid air barrier material in full contact with
substrate to produce a continuous seal with transition strips according to membrane air barrier
manufacturers written instructions.
1.
Vapor-Permeable Membrane Air Barrier: Total dry film thickness as recommended in
writing by manufacturer to meet performance requirements, but not less than 40-mil
(1.0-mm) dry film thickness, applied in one or more equal coats, roller- or spray- applied.
C.
Do not cover air barrier until it has been tested and inspected by Owner's testing agency.
D.
Correct deficiencies in or remove air barrier that does not comply with requirements; repair
substrates and reapply air-barrier components.
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1.23
INSTALLATION OF AIR BARRIER ACCESSORY MATERIALS
A.
General: Install strips, transition strips, and accessory materials according to air-barrier
manufacturer's written instructions. Install strips and transition strips to form connect and seal
membrane air barrier material to adjacent components of building air barrier system, including,
but not limited to, roofing system air barrier, exterior fenestration systems, door framing, and
other openings.
B.
Primer: Apply primer per manufacturer’s installation instructions.
C.
Seal punctures, voids, and seams in strips. Patch with strips extending 6 inches (150 mm)
beyond repaired areas.
D.
Connect and seal exterior wall air-barrier membrane continuously to subsequently-installed
roofing-membrane air barrier, concrete below-grade structures, floor-to-floor construction,
exterior glazing and window systems, glazed curtain-wall systems, storefront systems, exterior
louvers, exterior door framing, and other construction used in exterior wall openings, using
accessory materials.
Specifier: Retain "Wall Openings Transition Assembly Installation" paragraph if utilizing Tremco
ETA assembly at aluminum-framed wall openings; coordinate with requirements in
corresponding Division 08 openings sections.
E.
Wall Openings Transition Assembly Installation: Apply opening transition assembly so that a
minimum of 3 inches (75 mm) of coverage is achieved over adjacent panel substrate. Apply
manufacturer's recommended silicone joint sealant bedding bead to aluminum frame and
mechanically attach transition assembly aluminum race to aluminum frame. Embed transition
assembly silicone sheet in continuous application of silicone joint sealant on sheathing panel
surface; roll silicone strips to achieve full adhesion with substrates.
F.
Rough Openings: Treat rough openings with a joint sealant bead in joints, followed by a base
coat of air barrier membrane, install reinforcement fabric and a final top coat of air barrier
membrane
G.
Seal punctures, voids, and seams in strips. Patch with strips extending 6 inches (150 mm)
beyond repaired areas.
H.
Flashings: Seal top of through-wall flashings to membrane air barrier with continuous transition
strips of type recommended by sheet air barrier manufacturer for type of flashing.
1.24
FIELD QUALITY CONTROL
Specifier: Retain one of two options below based upon Project requirements.
A.
Testing Agency: Owner may engage a qualified testing agency to perform tests and inspections.
1.
B.
Inspections: Air-barrier materials, accessories, and installation are subject to inspection
for compliance with requirements and photo documentation of conditions to be concealed
by subsequent Work.
Tests: As determined by Owner's testing agency from among the following tests:
1.
Qualitative Air-Leakage Testing: Air-barrier assemblies will be tested for evidence of air
leakage according to ASTM E 1186, smoke pencil with pressurization or depressurization
or ASTM E 1186, chamber pressurization or depressurization with smoke tracers.
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Specifier: Retain "Quantitative Air-Leakage Testing" Subparagraph below if testing to quantify
air-leakage rate is required.
2.
Quantitative Air-Leakage Testing: Air-barrier assemblies will be tested for air leakage
according to ASTM E 783.
Specifier: Retain "Testing" referring paragraph below if wall air barrier testing is described in
Division 01 performance requirements or envelope commissioning section; edit to suit Project
requirements.
3.
Testing: Refer to Section [01 80 21 Facility Exterior Envelope Commissioning] [01 83 16
"Exterior Enclosure Performance Requirements"] for additional testing and inspection
requirements.
C.
Coordination of Testing: Cooperate with testing agency. Allow access to work areas and
staging. Notify testing agency in writing of schedule for Work of this Section to allow sufficient
time for testing and inspection.
1.
Do not cover Work until testing and inspection is completed and accepted.
D.
Reporting: Forward written inspection reports to the Architect within 10 working days of the
inspection and test being performed.
E.
Correction: Correct deficient applications not passing tests and inspections, make necessary
repairs, and retest as required to demonstrate compliance with requirements.
F.
1.25
Repair damage to air barriers caused by testing; follow manufacturer's written instructions.
CLEANING AND PROTECTING
A.
Clean spills, stains, and overspray resulting application utilizing cleaning agents recommended
by manufacturers of affected construction. Remove masking materials.
B.
Protect membrane air barrier from damage from subsequent work. Protect membrane
materials from exposure to UV light for period in excess of that acceptable to membrane air
barrier manufacturer; replace overexposed materials and retest.
END OF SECTION
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