Spray Foam Insulation Do you recommend the spray foam insulation for the walls and rafters? Tom, We are building a 1200 ft farm house in East Texas. Hardy Plank with a Metal roof. Can it be used in combination with conventional insulation? Joe Listen to Tom’s answer: Podcast: Play in new windowSubscribe: Apple Podcasts | Android | RSS Related PostsInsulating metal buildingsShould I use closed cell spray foam insulation in my walls and attic?Should I add insulation in my walls?Tom, Is it a good idea to use insulating foam inside my hollow door to help with sound proofing?What’s the advantage of spraying foam over roof shingles?