1 Answer

+1 vote
answered Aug 26, 2014 by belmoreno (2,190 points) | edited Aug 27, 2014 by belmoreno

 

Mastic: Weatherproofing mastic should be breather type, asbestos free, vinyl acrylic or polyvinyl acetate with a flame spread of less than 20, with the ability to withstand a constant operating temperature of 180°F or greater.

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