Sealing concrete foundation – foam insulation joints
Hello GBA Community – we poured concrete basement slabs about a week ago, with XPS installed vertically between the foundation walls and slab as a thermal break. The vapor barrier laps up between the wall and the XPS, though isn’t taped to the wall. Should I use a sealant or tape to ensure a continuous air barrier, and if so, does anyone recommend a good product that will adhere to both the concrete and XPS? It is a bit wet out, and we plan to install the XPS layer for the walls above this gap tomorrow, so I may miss the opportunity to seal this joint if the product needs to be applied to a dry surface. I’ve attached a photo to this note. Thanks!
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