Amend3 - 07 25 00-RIB-Weather Barriers-06-20-2022.pdf
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- Attached to
- USFS Sisters Storage Building
- Solicitation number
- 1240BH22R0014
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This section specification outlines requirements for weather barriers on a US Forest Service storage building project. Air barrier and water-resistive barrier materials must form a system to prevent air and liquid water passage through exterior walls and joints. Acceptable products include mechanically fastened air barrier sheets. Installation must follow manufacturer's instructions, including sealing seams and edges to be airtight. Openings and penetrations require flashing and sealing. The project will undergo quality inspection and testing.
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USFS Sisters Ranger District Storage Building
100% CD Submittal January 28, 2022
07 25 00
SECTION 07 25 00
WEATHER BARRIERS
PART 1 GENERAL
1.01 SECTION INCLUDES
A. Air Barriers: Materials that form a system to stop passage of air through exterior walls, joints between exterior walls and roof, and joints around frames of openings in exterior walls.
1.02 RELATED REQUIREMENTS
A. Section 07 62 00 - Sheet Metal Flashing and Trim: Metal flashings installed in conjunction with weather barriers.
B. Section 08 51 13 - Aluminum Windows: Sealing weather barriers and vapor retarders to window frames.
1.03 DEFINITIONS
A. Weather Barriers: Assemblies that form either water-resistive barriers, air barriers, or vapor retarders.
B. Water-Resistive Barrier: A material behind an exterior wall covering that is intended to resist liquid water that has penetrated behind the exterior covering from further intruding into the exterior wall assembly.
1.04 REFERENCE STANDARDS
A. ASTM D1970/D1970M - Standard Specification for Self-Adhering Polymer Modified Bituminous
Sheet Materials Used as Steep Roofing Underlayment for Ice Dam Protection 2015a.
B. ASTM E96/E96M - Standard Test Methods for Water Vapor Transmission of Materials 2014.
C. ICC-ES AC148 - Acceptance Criteria for Flexible Flashing Materials; ICC Evaluation Service, Inc. 2011.
1.05 ADMINISTRATIVE REQUIREMENTS
A. Preinstallation Meeting: Convene one week before starting work of this section.
1. Include all trades affected by the work of this section, including windows, doors and mechanical, plumbing and electrical penetrations.
1.06 SUBMITTALS
A. See Section 01 30 00 - Administrative Requirements for submittal procedures.
B. Product Data: Provide data on material characteristics.
C. Shop Drawings: Provide drawings of connections of membrane to windows and doors, inside and outside corners on exterior of building, and all special joint conditions.
D. Manufacturer's Installation Instructions: Indicate preparation, installation methods, and storage and handling criteria.
1.07 QUALITY ASSURANCE
A. Air Barrier Association of America (ABAA) Quality Assurance Program (QAP);
www.airbarrier.org:
1.08 MOCK-UPS
A. Install air barrier, vapor retarder, and water-resistive barrier materials in mock-up specified in
Section 01 4000.
1.09 FIELD CONDITIONS
A. Maintain temperature and humidity recommended by materials manufacturers before, during, and after installation.
Weather Barriers
Storage Building
100% CD Submittal January 28, 2022
07 25 00
PART 2 PRODUCTS
2.01 WEATHER BARRIER ASSEMBLIES
2.02 AIR BARRIER MATERIALS (WATER VAPOR PERMEABLE AND WATER-RESISTIVE) RFI
6/20/22 A. Air Barrier Sheet, Mechanically Fastened:
1. Manufacturers:
a. Basis of Design - DuPont de Nemours, Inc.; Tyvek Commercial Wrap:
www.dupont.com.
b. Berry Global, Inc.; Typar Buildingwrap: www.typar.com.
c. Henry Company; WeatherSmart Commercial: www.henry.com.
d. Substitutions: See Section 01 60 00 - Product Requirements.
2.03 ACCESSORIES
A. Sealants, Tapes, and Accessories Used for Sealing Water-Resistive Barrier and Adjacent
Substrates: As indicated or complying with water-resistive barrier manufacturer's installation instructions.
B. Flexible Flashing: Self-adhesive sheet flashing complying with ASTM D1970/D1970M, except slip resistance requirement is waived if not installed on a roof.
1. Width: 4 inches.
PART 3 EXECUTION
3.01 EXAMINATION
A. Verify that surfaces and conditions comply with requirements of this section.
3.02 PREPARATION
A. Remove projections, protruding fasteners, and loose or foreign matter that might interfere with proper installation.
B. Clean and prime substrate surfaces to receive adhesives and sealants in accordance with manufacturer's installation instructions.
3.03 INSTALLATION
A. Install materials in accordance with manufacturer's installation instructions.
B. Apply sealants and adhesives within recommended temperature range in accordance with manufacturer's installation instructions.
C. Mechanically Fastened Exterior Sheets:
1. Install sheets shingle-fashion to shed water, with seams aligned horizontal.
2. Overlap seams as recommended by manufacturer, 6 inches, minimum.
3. Overlap at outside and inside corners as recommended by manufacturer, 12 inches, minimum.
4. For applications indicated to be airtight, seal seams, laps, penetrations, tears, and cuts with self-adhesive tape; use only large-headed, gasketed fasteners as recommended by manufacturer.
5. Install water-resistive barrier over jamb flashings.
6. Install head flashings under water-resistive barrier.
7. At framed openings with frames having nailing flanges, extend sheet into opening and over flanges; at head of opening, seal sheet over flange and flashing.
D. Openings and Penetrations in Exterior Water-Resistive Barriers:
1. Install flashing over sills, covering entire sill framing member, and extend at least 5 inches onto water-resistive barrier and at least 6 inches up jambs; mechanically fasten stretched edges.
2. At openings filled with frames having nailing flanges, seal head and jamb flanges using a continuous bead of sealant compressed by flange and cover flanges with sealing tape at least 4 inches wide; do not seal sill flange.
Storage Building
100% CD Submittal January 28, 2022
07 25 00
3. At openings filled with nonflanged frames, seal water-resistive barrier to each side of framing at opening using flashing at least 9 inches wide, and covering entire depth of framing.
4. At head of openings, install flashing under water-resistive barrier extending at least 2 inches beyond face of jambs; seal water-resistive barrier to flashing.
5. At interior face of openings, seal gaps between window and door frames and rough framing using appropriate joint sealant over backer rod.
6. Service and Other Penetrations: Form flashing around penetrating items and seal to surface of water-resistive barrier.
3.04 FIELD QUALITY CONTROL
A. See Section 01 40 00 - Quality Requirements for additional requirements.
B. Owner’s Inspection and Testing: Cooperate with Owner’s testing agency.
1. Allow access to work areas and staging.
2. Notify Owner’s testing agency in writing of schedule for work of this section to allow sufficient time for testing and inspection.
3. Do not cover work of this section until testing and inspection is accepted.
C. Do not cover installed water-resistive barriers until required inspections have been completed.
D. Take digital photographs of each portion of installation prior to covering up weather barriers.
3.05 PROTECTION
A. Do not leave paper- or felt-based barriers exposed to weather for longer than one week.
END OF SECTION 07 25 00
Storage Building
100% CD Submittal January 28, 2022
07 25 00
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072500 RIB - Weather Barriers
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