PACE REPRESENTATIVES INC. GUIDE SPECIFICATIONS
0NE ROCKDALE STREET
SUITE 200
BRAINTREE MA 02184
SECTION 07270
AIR BARRIER MEMBRANES
PART 1 GENERAL
1.1 SUMMARY
A. Provide air barrier membranes at exterior wall assemblies and at locations required by code:
1.2 PERFORMANCE REQUIREMENTS
A. Commonwealth of Massachusetts Building Code Requirements: The intent of this specification is to require compliance with 780 CMR 13, including Section 1304.3, Air Leakage.
B. Code 780 CMR 1304.3.1, Air Barriers: The building envelope shall be designed and constructed with a continuous air barrier to control air leakage into, or out of the conditioned space. An air barrier shall also be provided for interior partitions between conditioned space and space designed to maintain temperature or humidity levels which differ from those in the conditioned space by more than 50 percent of the difference between the conditioned space and design ambient conditions. The air barrier shall have the following characteristics:
- It must be continuous, with all joints made air-tight.
2. It shall have an air permeability not to exceed 0.004 cubic feet per minute per square foot under a pressure differential of 0.3 in. water.
3. It shall be capable of withstanding positive and negative combined design wind, fan and stack pressures on the envelope without damage or displacement, and shall transfer the load to the structure. It shall not displace adjacent materials under full load.
4. It shall be durable or maintainable.
5. The air barrier shall be joined in an air-tight and flexible manner to the air barrier material of adjacent systems, allowing for the relative movement of systems due to thermal and moisture variations and creep. Connection shall be made between:
a. Foundation and walls.
b. Walls and windows or doors.
c. Different wall systems.
d. Wall and roof.
e. Wall and roof over unconditioned space.
f. Walls, floor and roof across construction, control and expansion joints.
g. Walls, floors and roof to utility, pipe and duct penetrations.
C. Code 780 CMR 1304.3.2, Air Barrier Penetrations: All penetrations of the air barrier and paths of air infiltration/exfiltration shall be made air-tight.
D. Design Intent: Air barrier membrane shall be located, constructed and flashed to perform as an air and water barrier to discharge to the outside any incidental condensation or water penetration. Air barrier membrane shall accommodate movements of building materials by providing expansion and control joints as required, with appropriate air seal materials at such locations, changes in substrate and perimeter conditions.
1.3 SUBMITTALS
A. Product Data: Submit manufacturer's product data for each material. Include standard details, certified test results, installation instructions, and recommendations for sealing penetrations and perimeter.
B. Samples: Submit three labeled samples of each product, not less than 6 by 12 inches in size.
C. Shop Drawings for Air Barrier Membrane Mockup: Submit shop drawings for mockup indicating size of mockup, details of construction, and expansion and control joints. Include relationship with adjacent materials, sequence of installation and materials and methods for sealing penetrations. Obtain approval of shop drawings prior to construction of mockup. Revise to show changes necessary to obtain approval of mockup.
D. Shop Drawings: Submit shop drawings indicating details of construction, including expansion and control joints. Include relationship with adjacent materials, sequence of installation and materials and methods for sealing penetrations. At a minimum, shop drawings shall include details of the following connections, as applicable to the project:
- Foundation and walls.
2. Walls and windows or doors.
3. Different wall systems.
4. Wall and roof.
5. Wall and roof over unconditioned space.
6. Walls, floor and roof across construction, control and expansion joints.
7. Walls, floors and roof to utility, pipe and duct penetrations.
E. Qualifications of Installer: Submit qualifications of firm installing air barrier membrane materials, including name and qualifications of supervisor for this project, and including name and location of three projects where similar work was performed by both firm and supervisor.
F. Mockups of Air Barrier Membrane Installation: Prior to installation on the building, construct mockup of typical exterior wall assembly, including connection between wall and roof, and connection between wall and glazing to indicate relationship of materials with air barrier and quality of workmanship. Mockup shall use actual air barrier membrane, wall, window and roof materials. Provide several mockups if necessary to include the various conditions. Remove mockup assemblies from site at completion of project. Rebuild mockups which are not approved at no additional cost to the Owner.
- Construct mockup in accordance with details of mockup indicated on the Drawings.
1.4 FIELD TESTING OF MOCKUP
A. Static Test for Exterior Wall Mockup Including Window Penetration and Intersection of Roof and Wall:
- Install air seal components and assemblies to resist air leakage caused by static air pressure across exterior wall assemblies and other interruptions to the integrity of the building enclosure systems.
2. Condition the sample by cycling in four pounds per square foot increments to 40 pounds per square foot, or to the highest pressure below 40 pounds per square foot practical without damaging components and return pressure to zero prior to commencing test.
3. Test to pressure differential of 0.3 in. water as specified in code and as measured in accordance with ASTM E283.
4. If assembly fails to meet performance value of not more than 0.03 cubic feet per minute per square foot air leakage, determine cause, rebuild assembly and retest until assembly passes, at no additional expense to the Owner.
B. Qualifications of Testing Laboratory: Testing shall be performed by an acceptable independent testing laboratory. If requested, submit qualifications of laboratory using criteria conforming to ASTM E 699.
1.5 PROJECT MEETINGS
A. Pre-Construction Meeting: After approval of mockup shop drawings, but prior to construction of mock-up, convene a meeting with representatives of materials to be incorporated in the mockup and installers of mockup. Agenda shall include sequence and details of construction to ensure continuity of air barrier.
B. Pre-Installation Meeting: Convene a pre-installation meeting a minimum of one week prior to commencing work of this section. Attendees shall include representatives of air barrier manufacturer, exterior wall installers and project superintendent. Agenda shall include the following:
- Review of approved submittals.
2. Review of mock-ups.
3. Coordination with sequence of installation with adjacent materials.
4. Schedule for subsequent work covering air barrier.
5. Procedures for quality assurance.
PART 2 PRODUCTS
2.1 LIQUID AIR BARRIER MEMBRANE
A. Liquid Air Barrier Membrane: Water-based asphalt emulsion modified with a blend of synthetic rubbers and special additives, compatible with sheet membranes. Provide one of the following:
- Roller Grade: BARRITECH NP FIRE RATED-R by Carlisle Coatings and Waterproofing, Inc.
2. Spray Grade: BARRITECH NP FIRE RATED-S by Carlisle Coatings and Waterproofing, Inc.
2.2 SELF-ADHERING AIR BARRIER MEMBRANES
A. Self-Adhering Air and Vapor Barrier Membrane: Self-adhering, self-sealing and self-healing rubberized asphalt integrally bonded to polyethylene film, nominal 40 mil thickness overall. Provide compatible membrane joint tape recommended by manufacturer. Provide manufacturer's recommended primer and one of the following which meet or exceed specified requirements.
- CCW-705 FR FIRE RATED Membrane by Carlisle Coatings and Waterproofing, Inc.
B. Transition Materials: To provide an air barrier between the membrane and adjacent materials, provide transition materials consisting of Carlisle CCW Sure-seal Elastoform flashing. Provide the following materials as acceptable to the manufacturer of the air barrier membrane:
1. CCW Sure-seal Pressure Sensitive Elastoform Flashing
PART 3 EXECUTION
3.1 PREPARATION
A. Clean substrate surfaces to receive air barrier membrane in accordance with manufacturer's instructions. Apply primer if recommended by manufacturer.
3.2 INSTALLATION
A. Strictly comply with air barrier membrane manufacturer's printed instructions, approved submittals and the following:
- Apply materials within manufacturer's requirements for temperature and weather conditions.
2. Do not apply to wet or frozen substrates.
3. Do not allow contamination with dust or dirt.
4. Seal completely at edges, perimeter and penetrations.
B. Protect installed work from damage due to harmful weather exposures, physical abuse, and other causes.
C. Provide temporary protection over air barrier membrane if materials covering air barrier membrane will not be installed within manufacturer's recommended time limit for exposure.
D. Repair damage to air barrier membrane caused by construction activities or subsequent work prior to covering.
END OF SECTION
Cold Formed Metal Attachment/Support Framing for panel sustem:
A. Cold rolled steel framing to ASTM A792, 55 percent AL-ZN, nominal coating weight of 0.5 oz per square foot (total both sides) of gauge and spacing required to comply with metal wall panel system’s structural requirements as recommended by the panel manufacturer and engineer of record and in accordance with approved shop drawings.
1. Vertical Box Girt: Minimum 0.0475-inch thick (18 gauge) cold-formed steel.
a. Dimensions: 2.0 inches wide by 0.75 inches deep:
b. Attachment:
1) Pre-drilled holes, 8 inches on center, to receive fasteners and thermally isolated washer assembly for attachment to substructure.
c. Recommended Product: Level tech™ by Knight Wall Systems or approved equivalent.
2. Horizontal JTrack: Nominal 0.0475 inch thick (18 gauge) cold-formed steel.
a. Dimensions: 0.75 inches at base with 1.125 and 1.875 inch legs.
b. Weep Drains: 0.75 inches diameter at 2 inches on center along base to allow for drainage.
c. Attachment Slots: 2 inches on center along 1.875 inch leg to facilitate screw attachment to vertical box girt.
d. Recommended Product: RS Rail™ by Knight Wall Systems or approved equivalent.
B. Accessories:
1. Fasteners: Stainless steel as instructed by panel manufacturer.
a. No. 14 screws to be used to attach horizontal Jtrack to vertical box girt.
b. Minimum No. 12 stainless steel self-drill hex-head screw fasteners of sufficient length to provide solid attachment through rigid insulation to substructure as indicated on shop drawings.
2. Thermal Isolating Washers: Polyoxymethylene copolymer (POM) washers with integral centering lip to act as a thermal break between steel fastener and box girt.
a. Recommended Product: ThermaStop™ Isolator by Knight Wall Systems or approved equivalent
3. Galvanic Protection: Utilize tapes and other methods as necessary to separate and prevent contact between dissimilar metals.
END OF SECTION
2.
END OF SECTION