Is it okay to spray open-cell foam over a layer of closed-cell foam?

— Steven L'Heureux Richmond, VA

Answered by Danny Kelly on August 30, 2010

What kind of waterproofing can you use in crawlspaces to help with going green?

— Michael Deal Charlotte, NC

Answered by Danny Kelly on August 30, 2010

I live in an attached house (on both sides). Do I need to insulate my basement?

— DESIREE GARY Saint Albans, NY

Answered by Danny Kelly on August 24, 2010