Roof Deck Overlay

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Roof Deck Overlay

NOTE: See also Accepted Roof Deck Overlay Board products

For RoofStar Guarantee Standards pertaining to Deck Overlay Boards, refer to the appropriate subsections in either Low Slope Membrane Roof Systems or for ASM (Architectural Sheet Metal) Roof Systems.

A roof deck overlay (also called a system underlay) is installed under the roof system and over the roof deck assembly. 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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