Slab on Grade
Slab-on-grade construction: the Ecohome A to Z Slab building guide
...insulation, even in problem areas.
Install a polyethylene air / vapour barrier over the entire insulation area. In some cases, a coat of closed-cell spray foam will be added at this point in order to add insulation and to create a continuous moisture soil gas barrier.
Seal the polyethylene barrier at all penetration po...
