Deck and Wall Overlays

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Deck and Wall Overlays


Division E - General Information


Deck and Wall Overlays

NOTICE TO READER: This is an information page only. To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual Standard located in Division B.

Deck and wall overlays (also called a system underlays) are installed under the roof system and over the supporting deck or wall structure, to provide a suitable substrate for roof materials. These products are most commonly placed over steel decks to provide a level surface for the membrane, or as a thermal barrier between the roof deck and combustible insulation.

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