Terminating Exterior Insulation
I keep going back and forth with my foundation contractor regarding insulation. I have been planning to install 2″, R10 insulation board from the footings to above grade where the insulation meets the bottom of the exterior wall (see photo). This, based on what I’ve read, is the best way to prevent heat from escaping/bridging between the bottom of the sill plate and top of the foundation wall.
My foundation contractor insists I’m overthinking it and that the insulation does not need to extend above grade, but instead can be cut-off where the insulation comes up to the top of the slab.
I don’t know what’s right, but I most certainly want to make my investment in the insulation achieve the best results possible.
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