Question: We want to make a family room in part of our basement.
We have block foundation walls. Our sewer and waste pipes (plastic) are all inside the basement wall, running the length of the walls.We will put the studding and insulation about 5 inches from the walls to clear the pipes. Should the plastic vapor barrier sheeting be put against the back of the studding? And should we use roll insulation or 4-by-8 sheets of rigid foam/foil insulation?
We can find no information indicating where the plastic sheeting is placed when there will be an 8-inch air space. - J.M., Laureldale, Pa.
Answer: The main purpose of a vapor barrier is to protect the insulation and the wall cavity from moisture from inside the home. In a basement, the question is: Where does the moisture come from?
Is it from the finished room or from the basement walls? If the block walls are reasonably dry, then place the vapor barrier on the room side of the studs and over the insulation. If, on the other hand, the block walls are damp from time to time, then place the vapor barrier over the block walls.
I would recommend you do both, since the wall studs will not be touching the foundation walls.
It is not necessary to insulate the foundation walls unless the walls are above grade on the exterior. If the basement is totally in-ground, then insulate the block walls with a rigid foam insulation, leave the stud cavities open and do not use a vapor barrier on the stud wall.
Question: I saw a piece you wrote on tiny brown ants. I have looked and looked for Terro Ant Killer. Would you please send me the names of some dealers who carry it? -Mrs. J.J., Plainfield, Ind.
Answer: Terro Ant Killer is available in most supermarkets and hardware stores. Also, you can contact Senoret Chemical Co., 566 Leffingwell Ave., Kirkwood, MO 63122, or call (314) 966-2394 to find dealers in your area.