Foster® Vapor-FAS™ WB Coating 30-65™

• FOSTER® VAPOR-FAS™ WB COATING is an economical, fire- resistive, vapor retarder coating for use over many types of thermal insulation including polystyrene foam.
• It is ideal for use over ASJ, FRK and FSK jackets and board facings to give a vapor retarder seal at joints, laps and weld pin punctures.
• VAPOR-FAS™ WB COATING is formulated for indoor and outdoor commercial use. It has a mild, latex "paint-type" odor and is designed for use on insulated pipes, vessels, ducts and equipment operating between 32°F (0°C) and ambient temperatures.
• VAPOR-FAS™ WB COATING has a low WVTR rating effectively sealing against water ingress.
• VAPOR-FAS™ WB COATING meets NFPA 90A and 90B 25/50 requirements when used to seal seams and punctures in vapor retarder facings and jacketing.
• VAPOR-FAS™ WB COATING meets the requirements of:
  • MAS Certified Green®
  • California Dept. of Public Health Standard Method v1.2
  • VOC Emissions and Content requirements to contribute to LEED v4 EQ Credit: Low Emitting Materials – Paints and Coatings
  • Collaborative for High Performance Schools EQ 7.1

Preparation

• Stir well, Do not thin.
• Apply only to clean, dry, oil-free surfaces. Keep container closed when not in use.

Application – indoor and light duty outdoor

• To prevent water vapor and moisture infiltration, proper and complete flashing is required.
• Follow flashing specifications.

1. To seal seams, overlaps, punctures, penetrations and terminations of vapor retarder membrane jacketing:
2. Apply tack coat of Foster® VAPOR-FAS™ WB Coating at 2 gallons per 100 square feet (0.8 l/m2 ).
3. Embed Foster® MAST-A-FAB® White Membrane into the wet tack coat. Smooth membrane to avoid wrinkles and overlap all seams at least two inches (5 cm). Apply finish coat of VAPOR-FAS® WB Coating, within 1/2 hour of the tack coat application, at 2 gallons per 100 square feet (0.8 l/m2 ).
4. This application shall provide a minimum dry thickness of 31 mils (0.8 mm).

Brush

• Use a good brush, suitable for water-based paints, making strokes as long as possible over the surface.
• Apply with full brush and spread out evenly.
• Do not overwork.

Spray

• Foster® VAPOR-FAS® WB Coating may be airless spray applied.
• For spray equipment information, please consult Airless Spray Recommendations or contact your spray equipment supplier.
• Average viscosity range: 85,000 – 110,000 cps.
• Corrosion resistant pumps and fittings are suggested.

• Use fresh water to clean brushes and equipment before product dries. '
• Dry product may be removed with hot soapy water (with ammonia added) or strong solvents such as chlorinated solvent (non-flammable) or xylol or mineral spirits (flammable).

• Store and apply between 40°F (4°C) and 100°F (38°C), protect from freezing until dry.
• Always test foil and paper facings and plastic surfaces for acceptable adhesion before using.
• Outdoor horizontal surfaces must always drain completely. A pitch of at least 1/2" per foot (4 cm/m) is required.
• To resist rain wash-off, allow at least 16 hours drying time above 50°F (10°C), with a relative humidity of 50%.
• Higher humidity and/or lower temperature may retard drying.