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Area Separation Wall System Repairs

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The 2-hour fire rated Area Separation Wall System was developed over 50 years ago as a way to economically protect from fire two (2) separate units in apartments, townhomes, condominiums and duplexes. At times during the installation of the ASW system, mistakes are made or damage occurs to this assembly - and for that reason American Gypsum successfully performed a 2-hour full scale fire test per ASTM E119, with repairs to defects in this wall system.
On this page are nine (9) separate defects that were built into American Gypsum’s Area Separation Wall System, and how to successfully repair it in the field to ensure that the 2-hour fire rating is preserved.
NOTE - Only American Gypsum’s 1” M-Bloc Shaft Liner and 1” M-Glass Shaft Liner panels are approved for use in these repairs (test report - WFCi 19046).


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