Bill writes from Groton, Massachusetts: "I am planning on finishing my basement and using foamular on the foundation walls first. I was planning on gluing the 2"x4'x8' foamular to the cement with liquid nails, tape the seams with the build-r tape. I am just not sure what to seal the bottom and top of the foamular with. Can I use a latex caulk, silicone, great stuff foam? Once that is done will build traditional 2x4 walls, batt insulate and wall board. Sound reasonable?"

Answer: Any sealer used must be compatible with extruded polystyrene (non-petroleum or asphalt based).We do not recommend installing batts in front of the FOAMULAR® insulation. If FOAMULAR insulation is used in conjunction with batts, the batts should be installed first. Then the FOAMULAR insulation is applied to the studs before the finishing material is applied.