PT ledger to concrete wall

I've never called out sill seal for this connection. Is the purposed to provide a moisture barrier? I almost think it would be better not to have it so that air can get in there and dry out the wood if it does get wet.

Eng16080 said:

I've never called out sill seal for this connection. Is the purposed to provide a moisture barrier? I almost think it would be better not to have it so that air can get in there and dry out the wood if it does get wet.

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I agree with this. Water's going to get back there no matter what you do. The only question is how easily it can get out, and sill gasket isn't going to help that at all.

I wouldn't use sill seal either. You could install a piece of flashing over the ledger board and seal it into a reglet cut into the masonry.

EIT

These days we like to integrate the ledger into the drainage plane. You (or architect) should specify the tie-in behind the ledger - adhered membrane such as Blueskin SA - and above the ledger (e.g. bent metal flashing or Blueskin VP if concealed). See here and here. Same principal for a concrete wall as it is a wood stud wall.

From a waterproofing standpoint for a wood framed wall, that detail seems alright. Structurally, though, I wouldn't want the load transfer from the joist so close to the bottom of the ledger.

For a concrete wall, I'm not sure this is necessary, but curious to see what others do.