P.T. Ledger requirements

[lsmfse]

Does anyone know of a code requirement that requires pressure treated ledgers connected to concrete tilt-up or masonry walls be used to support roof framing? 1997 UBC section 2306.9 appears to allow non-pressure treated wood provided roof is waterproofed.

 

[Kramer]

It is my understanding that the code does not require ledgers to be pressure treated unless they are in contact with "foundation concrete". I think it is a good idea however for roof ledger to be P.T., particularly if the possibility exists for moisture to wick through the wall. This is especially a concern at the control joints. In a lot of tilt-up type buildings however, the roof structure is open and can dry out if the ledger does get wet.