Bottom edge detail – rigid foam next to sill plate
I’ve read through most of the previous posts regarding protecting the bottom edge of exterior insulation from rodents / insects. It seems the perforated U-shaped channel is typically preferred, though can be challenging/expensive to source in certain areas.
I’m building a small DIY addition with 2″ polyiso on the exterior, zone 6A. The edge of my ICF stem wall extends beyond the sheathing by 1/2″. I’m looking to come up with a better, less expensive option for protecting the polyiso at the base:
*Install Polyiso, tight to the ICF EPS at bottom
*Install 1×3 rain screen furring, extending slightly below Polyiso (~1/8″)
*Install all other wall cladding/details, water table trim 1/8 below furring
*Install Aluminum flat sheet, 16ga as shown in pic (1/8″ holes predrilled) (no bug screen planned at this point). Wedge between ICF foam and Polyiso and screwed to bottom of furring strips.
*Install ICF protective coverboard, with upward pressure when attaching to ensure there are no gaps between Aluminum and ICF coverboard.
What this does:
*simple, well protected, low-cost
*no special bending / or difficult to source materials
*avoid Cora-vent cost / installation
*protect bottom of foam and furring from rain backsplash (close to grade)
*easy to install / inspect
*not integrated / easy to replace
I’m thinking this would work well as long as I put enough holes in the aluminum.
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