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					Air Barrier Association of America
1600 Boston-Providence Turnpike
Walpole, MA 02081
Toll Free: (866) 956-5888
Web Site: www.airbarrier.org


                                      Masterformat Specification



 Specifier Note: This Specification is written according to the Construction Specifications Institute
 (CSI) 3-Part Format, including MasterFormat, SectionFormat, and PageFormat, contained in the CSI
 Manual of Practice.

 The section must be carefully reviewed and edited by the Architect to meet the requirements of the
 project and local building codes. Coordinate this section with other specification sections and the
 drawings.

 Delete all "Specifier Notes" when editing this section.


                                             SECTION 07280

                                  WATER-RESISTIVE BARRIERS


 Specifier Note: This section covers housewrap materials that are thin, vapor permeable sheet water-
 resistive barriers that are mechanically attached directly to framing members or over exterior
 sheathing materials in residential applications. Water-resistive barriers are materials that are
 intended to perform as a secondary weather barrier behind an exterior cladding, providing a means to
 protect the wall assembly from bulk water that penetrates the exterior cladding. Contact the specific
 housewrap manufacturer for assistance in editing this section for the specific application.



PART 1       GENERAL

1.1    SECTION INCLUDES

 A. Housewrap materials are water-resistive barriers that perform as secondary weather barriers
    installed behind exterior claddings to provide a secondary line of defense to protect the wall
    assembly from bulk water that penetrates the exterior cladding. The housewrap is a drainage
    plane that assists in the management of bulk water.

 B. As a secondary function, housewraps perform as air retarders for low-rise residential applications.




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1.2    RELATED SECTIONS

 Specifier Note: Edit the following list of related sections as required for the project. List other
 sections with work directly related to this section.

 A.    Section 07100 - Dampproofing and Waterproofing.

1.3    REFERENCES

 Specifier Note: List standards referenced in this section, complete with designations and titles. This
 article does not require compliance with standards, but is merely a listing of those used.


 A.    AATCC-127 - Water Resistance: Hydrostatic Pressure Test.

 B.    AC38 – ICC-ES Acceptance Criteria for Water-Resistive Barriers.

 C.     ASTM D 828 - Standard Test Method for Tensile Strength of Paper and Paperboard.

 D.    ASTM D 882 - Standard Test Method for Tensile Properties of Thin Plastic Sheeting.

 E.    ASTM D 1117 - Standard Guide for Evaluating Nonwoven Fabrics.

 F.    ASTM D 1777 - Standard Test Method for Thickness of Textile Materials.

 G.    ASTM D 3776 - Standard Test Method for Mass Per Unit Area (Weight) of Fabric.

 H.    ASTM D 5034 - Standard Test Method for Breaking Strength and Elongation of Textile Fabrics.

 I.    ASTM E 84 - Standard Test Method for Surface Burning Characteristics of Building Materials.

 J.    ASTM E 96 - Standard Test Method for Water Vapor Transmission of Materials.

 K.    ASTM E 283 - Standard Test Method for Determining Rate of Air Leakage Through Exterior
       Windows, Curtain Walls, and Doors Under Specified Pressure Differences Across the
       Specimen.

 L.    ASTM E 330 - Standard Test Method for Structural Performance of Exterior Windows, Doors,
       Skylights and Curtain Walls by Uniform Static Air Pressure Difference.

 M.    ASTM E 331 - Standard Test Method for Water Penetration of Exterior Windows, Skylights,
        Doors and Curtain Walls by Uniform Static Air Pressure Difference.

 N.    ASTM E 1677 – Standard Specification for an Air Retarder (AR) Material or System for Low-
       Rise Framed Building Walls.

 O.    Canadian Construction Materials Centre – CCMC Technical Guide 07102 for Sheathing,
       Membrane, Breather-Type.




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1.4    SUBMITTALS

 A.    Comply with Section 01330 - Submittal Procedures.

 B.    Product Data: Submit manufacturer's product data, including installation instructions.

 C.    Samples: Submit manufacturer's samples of housewrap material.

 D.    Manufacturer's Certification: Submit manufacturer's certification that materials comply with
       specified requirements and code compliance and are suitable for the intended application.

1.5    QUALITY ASSURANCE

 A.    Installer Qualifications: Installer experienced in performing work of this section who is
       specialized for installation work similar to that required for this project.

 Specifier Note: Paragraph below should list obligations for compliance with specific code
 requirements particular to this section. General statements to comply with a particular code are
 typically addressed in Conditions of the Contract and Division 1 Regulatory Requirements Section.
 Repetitive statements should be avoided.

 B.    Regulatory Requirements: (Specify applicable requirements of regulatory agencies.)

       1. Compliance: Provide products that meet the following requirements:

          a. ICC-ES Acceptance Criteria for Water-Resistive Barriers (AC38)

          b. ASTM E 1677: Standard Specification for an Air Retarder (AR) Material or System for
             Low-Rise Framed Building Walls


1.6    DELIVERY, STORAGE, AND HANDLING

 A.    Delivery: Deliver materials to site in manufacturer's original, unopened containers and
       packaging, with labels clearly identifying product name and manufacturer.

 B.    Storage: Store materials in clean, dry area in accordance with manufacturer's instructions.

 C.    Handling: Protect materials from damage during handling and installation.

1.7    Warranty

 A.    Manufacturer’s Warranty: Contact the housewrap manufacturer to obtain warranty information.

PART 2      PRODUCTS

2.1    MANUFACTURERS

 Atlanta Nisseki CLAF, Inc.: www.clafusa.com

 Covalence: www.covalencecoatedproducts.com

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 Dow: www.dow.com

 Dupont: www.tyvek.com

 National Shelter Products: www.nationalshelter.com

 Owens Corning: www.owenscorning.com

 Pactiv Building Products: www.green-guard.com

 Valeron Strength Films: www.valeron.com

 VaproShield: www.vaproshield.com

2.2    PERFORMANCE REQUIREMENTS

 Specifier Note: Specify a housewrap that meets the specifications shown below. Add water-resistive
 barrier to the housewrap description in exterior wall systems that incorporate structural sheathings
 and foam plastic insulating sheathings. Consult the Air Barrier Association of America for additional
 information at www.airbarrier.org

  A.   Water-resistive Barrier Building Code and Industry Compliance Requirements:
       1.  Description: Housewraps are water-resistive barriers that perform as secondary weather
           barriers installed behind exterior claddings to provide a secondary line of defense to
           protect the wall assembly from bulk water that penetrates the exterior cladding. The
           housewrap is a drainage plane that assists in the management of bulk water.
       2.  As a secondary function, housewraps perform as air retarders for low-rise framed
           buildings.

 B.    Material: Housewraps are thin, vapor permeable sheet water-resistive barriers that are
       mechanically attached directly to framing members or over exterior sheathing materials in
       residential applications.

 C.    Typical Thickness(s), ASTM D 1777: 0.003 to 0.015 inch (0.08 to 0.38 mm).

 D.    Typical Weight(s), ASTM D 3776: 7 to 28 lbs./1000 ft2 (34 to 137 g/m2).

 E.    Water Penetration Resistance (must meet one of the following requirements):
           a. ASTM D 779: 10 minute minimum.
           b. AATCC-127: 22 inches (55 cm) hydrostatic head for 5 hours.
           c. CCMC 07102, Section 6.4.5: 1 inch (25.4 mm) hydrostatic head for 2 hours.

 F.    Water Vapor Permeance, ASTM E 96, Procedure A: Minimum 5 perms (35 g/m2/ 24
       hours).

 G.    Tensile/Breaking Strength (must meet one of the following requirements):
            a.    ASTM D 828 or ASTM D 882: Minimum 20 pounds per inch (3.6 N/mm).
            b.    ASTM D 5034: Machine,MD 40 psi (275 kPa)/Cross, CD 35 psi (241 kPa).

 H.    Surface Burning, ASTM E 84: Flame Spread Maximum of 25 (Class A).

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  I.      Pliability, ICC-ES AC38, Section 3.3.4: No cracking.

 J.       Air Retarder Material/System, ASTM E 1677, Type I (the following requirements apply):
               a. Rate of Air Leakage, ASTM E 283: 0.06 cfm/ft 2 at 1.57 psf (0.3 L/s/m2).
               b. Structural Performance, ASTM E 330: Minimum 1 hour at 65 mph (500 Pa).
               c. Water Resistance, ASTM E 331: Minimum 15 Minutes at 0.11 in. (2.8 mm) of water
                   at 15 mph (27 Pa).

2.3       ACCESSORIES

 A.       Fasteners: Housewraps are typically installed using plastic cap nails, roofing nails, staples and
          metal screws with steel plates (for attaching to steel studs).

 B.       Housewrap Seam Tape: Refer to the housewrap manufacturer’s installation guidelines for
          taping recommendations.

PART 3          EXECUTION

3.1       EXAMINATION

 A.       Examine areas to receive housewrap. Notify architect of conditions that would adversely affect
          installation. Do not proceed with installation until unsatisfactory conditions are corrected.

3.2       MANUFACTURER’S INSTRUCTIONS

 A.       The applicable housewrap manufacturer’s installation guidelines and applicable ICC-ES
          Evaluation Report shall be strictly adhered to and copies of these documents shall be available
          at all times on the jobsite during installation. Any deviations from these published documents
          must be approved by the housewrap manufacturer prior to installation or any warranty set forth in
          Section 1.7 may be void.

3.3       INSTALLATION

 Note 1: Do not use housewrap as a roofing paper or as a vapor retarder.
 Note 2: Contact the housewrap manufacturer for special installation details, such as window flashing
 integration and sealing of penetrations.

       A. Install housewrap over structural sheathing board, over non-structural insulative sheathing or
          directly to framing members.

       B. Begin by aligning the bottom edge of the roll with the base of the wall in a straight and plumb
          fashion, providing at least a 12-inch (305 mm) piece of material to secure around corners.

      C. Unroll the housewrap with the printed side facing the exterior, wrapping the entire building,
         including door and window openings. Position the roll to cover the edge of the sill plate and
         overlap the foundation wall at least 2 inches (50 mm). Housewraps can be installed over
         structural sheathing, over non-structural sheathings such as foam plastic insulation, or directly to
         framing members. When installing housewraps over structural sheathing, the fasteners must
         penetrate the sheathing a minimum of ½ inch (13 mm). When installing housewrap directly to
         framing members or through non-structural sheathings, fasteners must extend into the
         underlying wood framing members a minimum of 1/2 inch (13 mm), The most common

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         fasteners for attaching housewraps are roofing nails, plastic cap nails with a 1 inch (25 mm)
         diameter cap, common roofing nails or staples with a minimum 1 inch (25 mm) crown. If smaller
         crown staples are used, then more fasteners may be needed to adequately attach the
         housewrap. When attaching to steel studs, the most common fastener type is a metal screw with
         a 1-inch (25 mm) diameter steel plate.

      D. Housewraps fasteners are typically spaced 6 -18 inches (152 – 457 mm) apart vertically and
         16 – 24 inches (406 – 610 mm) apart horizontally. Refer to the housewrap manufacturer’s
         installation guidelines for recommended fastener types and fastening frequency.

      E. When the end of a roll is reached, fold the edge of the housewrap under itself and attach to the
         structural sheathing or through the non-structural sheathing to the nearest framing member.
         Horizontal joints must be overlapped a minimum of 2 inches (50 mm) with upper courses
         overlapping lower courses in water-shedding fashion. Vertical seams must be overlapped a
         minimum of 6 inches (152 mm). All vertical and horizontal seams can be taped using an
         adhesive tape recommended by the housewrap manufacturer. Although taping of housewrap
         seams is not required to achieve code compliance, it can provide additional protection against
         air and moisture intrusion.

      F. Make an inverted “I” cut through the housewrap at window and door openings and wrap excess
         material to the inside of the rough opening and fasten securely to a framing member. At the
         window header, make a 6 to 8 inch (152 – 203 mm) diagonal cut at the corners of the
         housewrap and fold the material up above the rough opening, exposing the underlying
         sheathing. This will allow for installation of the head flashing material, which will then be
         covered by the housewrap material when it is folded down and the diagonal cuts are taped. If
         windows are already in place when installing housewrap, trim as close to them as
         possible and tape all edges. Use of window flashing materials is required as described in the
         International Residential Code. Check local building codes to determine whether window
         flashing is a local requirement.

3.4      PROTECTION

 A.      Protect installed housewrap from damage until covered by exterior cladding as described in the
         housewrap manufacturer’s installation guidelines.


                                            END OF SECTION




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