Impervious moisture barriers are not included in this item, but using treated lumber seems to hinge on its distance above exposed ground. Item 2 in R317.1 requires treated lumber for “framing members that rest on concrete exterior foundation walls and that are less than 8 inches from exposed ground.” This item doesn’t refer to a “sill” directly, but it does refer to an exterior foundation wall.
#LAST WOOD REQUITEMENTR CODE#
But this code item refers specifically to a concrete “slab,” while our case talks about a foundation wall. For example, item 3, which appears to be closest to our target, says that “sills and sleepers on a concrete slab in contact with the ground must be treated.” However, in the 2006 edition of the IRC, an exception was added when there is an “impervious moisture barrier” between the sills and the slab. In Section R317 (Protection of Wood and Wood-based Products Against Decay) of the 20 IRC, the list of seven conditions in R317.1 where code requires treated material can be confusing. In most cases, those mudsills are made of treated lumber.īut here is where the code gets tricky. This foam material air-seals the joint between the foundation and the mudsills.
Roe Osborn After the foundation concrete cures, sill seal is usually the first thing to be installed.
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