Sharon writes from Harrisburg, North Carolina: "I am currently renovating an older home that has existing siding made of some form of wood or board. I am replacing the siding with an insulated siding product. The installer said it wasn't necessary to remove the old siding, and also that a housewrap is not needed with this product. This seems fishy to me. Should I be concerned?"

Answer: Owens Corning considers the application of PINKWRAP® housewrap to be optional. The product functions like a windbreaker to slow leaks and drafts (air infiltration). You can check with your local building code to see whether it is required in your area.