Do you need an interior vapor barrier when using icynene insulation?
No, but use your same exterior building practices. Q: Do the fumes from burning icynene pose a hazard in case of a home fire? A: Yes, but icynene is also a fire retarder. Questions about basement heating and insulating: Q: Is insulating the basement really all that necessary? A: Both Ken and Bill said that yes, it is. A lot of heat is lost through the basement. Q: Should bubble wrap be used on the basement slab? A: It is of questionable benefit. Q: What should be done about insulating block? A: You can either put foam around the exterior of it or inject the cavities with foam. If the structure is already built, drill holes in the block and then inject foam into the cavities through the holes. Q: How should a basement slab be insulated? A: First , it should be set on gravel and not dirt. Beneath the concrete, place 1-inch, 25lb rigid foam and use a vapor barrier either below or above the foam. The seams and cracks on the foam may be taped. On the exterior of the wall, use 2-inch foam. T
