31.   There are old knob-and-tube electric wires in the basement ceiling that still work.

32.   Then they get between the suspended basement ceiling and the floorboards above.

33.   This is wrong, but if you do it this way, or find your basement ceiling insulated this way, it may be OK.

34.   While you are at it, insulating the basement ceiling will add a few percentage points to your heat savings.

35.   Why bother with the basement ceiling?

36.   Why insulate a basement ceiling?

37.   Yes, you can insulate the basement ceiling.

38.   You probably already know that, but you can check the attic floor, the basement ceiling, and the walls.

39.   Its basements have become damp, with bricks falling out from the walls and basement ceilings, some of which are even covered with stalactites.