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Has anyone mixed open and closed cell in a roof assembly?

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Home › Community Forum › Open Cell vs Closed Cell › Has anyone mixed open and closed cell in a roof assembly?

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  • November 2, 2024 at 2:30 pm #2684
    Terry Fong
    Member

    I have heard some builders talk about doing a flash and batt style approach but with open cell over a thin closed cell layer. Has anyone tried this and what were the results on blower door tests?

    November 2, 2024 at 4:45 pm #2685
    Derrick Washington
    Member

    Yeah we do flash-and-fill a lot. 1-2 inches of closed cell first for vapor control and air sealing, then fill the rest with open cell. It is cost-effective since closed cell is pricier.

    November 3, 2024 at 9:12 am #2686
    Jennifer MacAllister
    Member

    We have gotten great blower door results with this approach. Under 1 ACH50 on most of our jobs. The key is making sure that first layer of closed cell is continuous with no gaps.

    November 3, 2024 at 11:30 am #2687
    Rick Deluca
    Member

    Interesting approach. Do you ever run into issues with adhesion of the open cell to the closed cell layer?

    November 4, 2024 at 8:00 am #2688
    Derrick Washington
    Member

    Not really if you apply the open cell while the closed cell is still within its cure window. If closed cell has fully cured you want to rough up the surface a bit first.

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