Vapor Retarder SA 31

• FM Global
• Underwriters Laboratories
• Meets 2012 IECC Air Barrier requirements, Materials (Section C402.4.1.2.1)

Self-adhesive SBS modified bitumen with a tri-laminated woven polyethylene facer. The self-adhesive back side is covered by a release liner.

N/A

Rolls must be stored upright with the selvedge side of the roll up. If the rolls are stored outdoors, cover them with an opaque protective cover after removal of the delivery packaging.

All surfaces must be clean, sound, dry, and free of loose materials or contaminants such as water, frost, ice, oil and grease that would interfere with proper adhesion and compromise the performance of the product.

  
In accordance with the ICRI Technical Guideline No. 310.2R-2013, newly poured concrete surfaces must be finished by forming, wood float, steel or power trowel, or broom finished to meet a CSP of 2 – 5.

Application to all substrates except steel require priming with Vapor Retarder Primer SB, Vapor Retarder Primer VC or Vapor Retarder Primer WB. See Vapor Retarder Primer SB, Vapor Retarder Primer VC or Vapor Retarder Primer WB product data sheets for additional information.

Begin the installation at the low point of the roof. Unroll Vapor Retarder SA 31 onto the substrate for alignment. Overlap each sheet by 3" (7.6 cm) on the side lap and 6" (15.2 cm) on the end laps. Priming laps may be required at cold temperatures.

Once the roll is aligned, peel back a portion of the release liner and press Vapor Retarder SA 31 onto the substrate. When securely adhered, remove the remaining release liner from the roll.

On steel decks install a 6" x 42" (15.2 cm x 1.1 m) metal plate under the end lap to support the membrane between the steel flutes. Stagger the end laps by at least 12" (30.5 cm).

Use a minimum 75 lb (34 kg) steel roller to press the Vapor Retarder SA 31 onto the substrate including the laps. Use the roller to push out any air bubbles out to the edge of the membrane. Do not cut the membrane to remove a bubble.

Apply Sika’s Mastic to seal around penetrations, T-joints, 90° angle transitions, fishmouths or other openings. Use a trowel to mound Sika’s Mastic around the penetrations to seal the opening. Do not apply Sika’s Mastic where it may come into direct contact with the Sarnafil or Sikaplan membrane.