Air Bloc^® 21 is a trowel consistency, solvent-type, synthetic rubber-based insulation adhesive formulated for easy application on a range of construction surfaces.

Air Bloc^® 21 is designed to provide an effective air and vapor barrier when used as a full bed adhesive in conjunction with rigid foam or semi-rigid paper-faced insulation.  Also available as a fire-resistive air and vapor barrier, Air Bloc^® 21FR is used as a full bed adhesive in conjunction with rigid foam or semi-rigid paper-faced insulation.

Another form of Air Bloc^® 21, Air Bloc^® 21S is a spray consistent, solvent-type, synthetic rubber-based insulation adhesive formulated for easy application on a range of wall surfaces.

Features

• Trowel-applied at temperatures as low as 10ºF (Air Bloc^® 21 and 21FR); Spray-applied at low temperatures on masonry, concrete, drywall and wood (Air Bloc^® 21S)
• Spreads smoothly on many surfaces, including masonry, concrete, gypsum board and wood
• Seals around projections such as brick ties
• Adheres to most types of rigid insulation
• Cures to a flexible film that resists air leakage

Packaging

• Air Bloc^® 21 and 21FR – Available in 5-gallon pails
• Air Bloc^® 21S – Available in 5-gallon pails or 55-gallon drums