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Do I need a product like Hydrogap between the basement wall and the foam board insulation?

user-6323668 | Posted in Energy Efficiency and Durability on

Mystic CT NZE house. I am applying a foil faced polyiso board (2.5″) on concrete basement walls. Do I need a product like Obdyke Hydrogap between the basement wall and the foam board insulation?

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  1. GBA Editor
    Martin Holladay | | #1

    Courtney,
    Q. "Do I need a product like Obdyke Hydrogap between the basement wall and the foam board insulation?"

    A. No. For more information, see How to Insulate a Basement Wall.

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