Covering for 2-inch rigid foam at base of siding?
I am considering a 2×6 wall assembly covered with plywood sheathing plus 2 inches of rigid foam under fiber-cement siding with a rainscreen. This will probably go over an ICF foundation.
I am not finding a detail for this specific situation, but similar details on GBA suggest having the sill plate align with the ICF. This will mean that there will be 2″ of foam exposed at the bottom, projecting past the foundation.
Is it necessary to have a piece of aluminum or similar protection covering the foam? Could you just cover it with weather resisitive barrier? Or simply let the siding project down past it by 3/4″ or so?
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