As per the attached sketch I am sheathing an exterior wood wall with 1″ rigid insulation on top of an ICF foundation.
Would you line up the insulation with the outside of the form, or would you line up the sill plate with the outside of the form.
I do see an opportunity to loose some foundation overhang cause by the wall assembly finishing with a course of veneer stone, but thought i’d throw it out there to see if there is actually a standard. I can’t seem to find the answer with google.
Replies
One of the red notes on your drawing is wrong. They both say the same thing. I assume you are using 2x6 walls. I'd line up the sill with the concrete and treat the outside of the form and the insulation above as a single plane. Run your water proofing membrane continuously from the foundation up the wall.
You should have some- albeit little, ledge for the sheathing, and there would be a type of flashing on the very bottom i don't recall the term for it but its an obtuse "L" that would be placed in with the vapor barrier. you have to imagine leaving as little exposed to humidity as possible (or have some type of ventilation for the OSB). **Also, the studs shouldn't be offset from the anchors
*I'd also look into having some type of mesh on the lowest section of the strapping, as a bug shield, they make specific stuff for this.
Maybe this'll help
I'm not familiar with the IRC, but from a structural point of view, the Canadian residential code allows the wall sill plate to project a maximum of 1/3 of the plate width over the support. The IRC probably has a similar clause.