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Underground roof with a tarp

DavidKing2017 | Posted in General Questions on

Is it a good idea to use tarp as the material for underground roof?

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  1. GBA Editor
    Martin Holladay | | #1

    David,
    No.

    -- Martin Holladay

  2. GBA Editor
    Martin Holladay | | #2

    David,
    Tarps degrade rapidly. Underground roofs require a heavy rubberized membrane like EPDM or a heavy peel-and-stick product or a pond liner -- and sometimes they require multiple layers of these heavy-duty membranes. They also require careful planning for drainage (using dimple mats, crushed stone, and perforated pipes.)

    What are you building that requires an underground roof?

    -- Martin Holladay

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