Do you recommend bio-based soy foam insulation?

— Amy Alexandria, VA

Answered by Andy Ault, CLC on November 1, 2010

We have an unheated crawlspace under our house that we would like to insulate.

— David Davison Middleburg, FL

Answered by Florian Speier on October 1, 2010

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