If slab edge thermal break is inside the stem wall except for at door openings, how far past the opening should I extend an exterior thermal break in those door locations?
I have a 4' deep stem wall with a independent concrete slab floor. I have a 2" XPS foam thermal break around the entire slab edge except for at door openings where the frost wall was dropped to accommodate a thicker slab.
I want to add an exterior thermal break at the door opening locations. How far past the door openings should I run the thermal break in order to prevent heat loss from "sneaking past"? Or will this not be a very effective thermal break since I'm switching from an inside to outside location at these spots?
Secondly, what do you think is a better thermal break.....1" cellular PVC trim board with a foam concrete expansion strip. Or, two layers of foam concrete expansion strip. I can't find an r-value for the foam product. It looks like a similar foam as the sill sealer product, but is probably 3-4 times thicker.
Posted Thu, 04/24/2014 - 13:45
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