PT bottom plate gasket

Old 04-08-16, 07:43 AM
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PT bottom plate gasket

Should a gasket be used between a PT bottom plate and the concrete slab when framing the walls? I know most people do not, however when you do a sill plate for example it needs to have both the gasket and PT wood.
Old 04-08-16, 08:39 AM
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Sill sealer under a sill plate serves as both an air sealer and a capillary break, preventing air from leaking in or out through small gaps and keeping moisture from wicking from the concrete into the framing.

For a basement wall, sill sealer usually isn't required by code when using PT bottom plate, and the air sealing aspect isn't needed, but it's still a good idea as a capillary break. A little moisture won't rot PT lumber, but it still can cause issues with attached finished materials like sheetrock and trim.

Given that it costs next to nothing, I use it even with PT bottom plates.

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