1.   Fiberglass batts are designed to fit between joists, studs or rafters.

2.   Fiberglass batts are available in precut lengths or in rolls.

3.   Here, fiberglass batts are useful because they fit easily around ducts, plumbing and wiring that run through the joist bays.

4.   Install fiberglass batts or rolls, with a vapor barrier down, touching the attic side of the ceiling.

5.   Install six-inch fiberglass batts with the paper backing up, touching the ceiling above.

6.   Most attics are insulated with fiberglass batts positioned between the joists.

7.   Should I install an additional vapor barrier and should I lay the new insulation on top of the old fiberglass batts?

8.   Simply look up between the floor joists to see if there are fiberglass batts.

9.   Some manufacturers offer fiberglass insulation batts with special perforated plastic wrapping.

10.   There is nothing quite so miserable as laying fiberglass batts or blowing cellulose in an attic floor in hot, muggy weather.