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Community and Q&A

Using sill gaskets and tar paper on the interior for interior ledgers

Richard Wang | Posted in Energy Efficiency and Durability on

So I have ledgers being bolted onto the foundation wall concrete to hang the joists after.

Right now I have tar paper between the ledger and the concrete so that the concrete can breathe.

I was wondering if I would need sill gasket as well on top of the tar paper to prevent moisture transfer.


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  1. GBA Editor
    Martin Holladay | | #1

    There is no need for the concrete to "breathe." It's important to install a vapor-impermeable layer at this location.

    What size are these "ledgers"? Are they 2x10s that will receive joist hangers? Are you using pressure-treated lumber?

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