Should I leave an air space between my attic insulation and the wood roofing?

— D.L. Bennett, Arlington, VA

Answered by Mike Binder on March 5, 2009

How can I improve my roof's venting?

— Vic

Answered by Mick Dalrymple on March 6, 2008

Can I safely re-use old cotton batting for attic insulation?

— Paul Richard, Vancouver, BC, Canada

Answered by Dietmar Lorenz on April 5, 2007