Sean writes from Bella Vista, Arkansas: "What is the correct R-value insulation to use in the ceiling above a bonus room? As best I can tell, ours is R-19 and it's compressed."

Answer: Your local building code official can best tell you what R-Value is required in the ceiling joist. If it is greater than R-19 you will have to fur out the ceiling joist to achieve the proper R-Value. There is a Compression Chart on the Owens Corning Web site that indicates the R-values that result when insulation is compressed in a cavity.