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Air seal the floor above an unconditioned basement or crawlspace and make sure floor insulation is in full contact with the underside of the subfloor.
Right - Air barrier is present and installed between the floor system and unconditioned space.
Right - Retrofit of an existing basement slab by adding dimple plastic mat, rigid foam insulation, and a floating subfloor.
Right - The existing basement slab is retrofitted by installing a dimple plastic drainage mat, rigid foam insulation, and a floating subfloor.
Rigid foam insulation and a thin slab were installed over the dirt and gravel of this sealed crawlspace
The existing slab is retrofitted by coating with epoxy paint, then installing rigid foam insulation and a floating subfloor.
The existing slab is retrofitted with epoxy paint, rigid foam insulation, sleepers (furring strips), and subfloor.
Wrong - No air barrier is present between the floor system and unconditioned space.