This expandable foam is recommended for void filling in nonstructural applications. It can be poured underneath decks and inside cavities where a lightweight flotation foam is needed to provide buoyancy.
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Oatey Closed to 7/8 in. to 4 in. Master Flash EPDM 6 in. x 6 in. Base Roof Flashing
Use silicone sealant between base and surface, and secure with sheet metal screws
