Brett writes from Topeka, Kansas: "Can you use Foamular® under a slab of a two story home? Are there problems with the weight of the wet newly poured slab compressing the foam board? What thickness would you recommend for such an application since there are no housing authority requirements?"

Answer: Yes, you can use FOAMULAR® insulation under a slab. Any questions about weight or load bearing will need to be answered by an architect or engineer. FOAMULAR insulation is made in five different compressive strengths - 15psi, 25psi, 40psi, 60psi and 100psi - and can be used in under-slab applications.