Design Polymerics DP 5050 Weather Barrier Breather Mastic

DP 5050 is a water based, high strength, premium quality, quick drying weather barrier coating. It has low odor and contains NO VOC’s. DP 5050 is a bright white color and has excellent brush and trowel properties.


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Product Description

Weather barrier mastics are also called breather mastics. Breather mastics have a perm rating over 10; DP 5050 and DP 5060 have a rating of 20. Breather mastics allow built up vapor pressure to pass through the mastic, thus allowing it to breath. Breathing helps prevent corrosion. Vapor barrier mastics like DP 3040 may be used outdoors to protect insulation, but corrosion could become a problem. The general rule of thumb is that weather barriers should be used outside the building envelope and vapor barriers should be used inside the building envelope.
DP 5050 has a higher viscosity than DP 5060 – choose DP 5060 for spray applications.

  • May be used for coating fiberglass, polystyrene board, closed cell polyethylene and polyurethane foams in mechanical and industrial thermal insulation applications.
  • May be used for bonding and coating of fiberglass mesh, canvas or other lagging fabrics over most types of thermal insulation.
  • May be used as a protective coating over expanded polystyrene foam to prevent dusting and protect from many solvents (DP 5050 White).


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General Insulation Company Inc. is an insulation supplier / insulation distributor that stocks and fabricates a wide variety of industrial and commercial air barrier, vapor barrier, moisture and water barrier products for the construction market.

DP 5050 Weather Barrier Technical Product Sheet

DP-5050 SDS

DP 5050 Zero VOC Independent Lab Test Results