Thermal Bridging with PVC vs. Z Flashing
I recently toured a where the designers noted the use of PVC rather than metal z-flashing at the bottom of wall/sill area to reduce thermal bridging. How important is this likely to be in a wall 2″ external foam (above and below ground) and 2×6 wall construction (CZ6)? Is there a simple calculation to model this? It total, a rather large area that is affected, and if attached to the sill plate, a rather direct bridge to the interior.
Here’s one source for the flashing:
https://plasticomponents.com/product/heavy-duty-z-flashing/ — I worry it might be hard to source non-metal flashing.
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