Is there a green way to kill the ants invading our kitchen?

— Adrienne Parks Huntington Beach, CA

Answered by Richard Heller on May 17, 2011

Does drywall, U.S.-made, outgas? Also, is it termite and mold resistant?

— Eva San Luis Obispo, CA

Answered by Cynthia Phakos on May 12, 2011

Is there pressure-treated wood that isn't treated with chemicals?

— Barbara Donahue Trumbull, CT

Answered by Anthony Addesso on April 21, 2011

Can you offer advice on constructing a well-insulated concrete slab?

— Garth Hawkins Woodbury, TN

Answered by Robert Hartford on April 17, 2011