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property Maintenance
Types of Attic Insulation
There are various types of insulation: fiberglass batts and blankets, loose-fill fiberglass, rock wool, and cellulose; polystyrene foam sheets, and urethane foam. Of these, four are appropriate for the average attic.
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If you hire a home improvement contractor, your best choices for attic insulation are more varied. Loose-fill rock wool and loose-fill fiberglass both require a contractor. Both also provide better coverage and are more effective than batts over ceiling joists.
If you elect to do the insulating yourself, Fiberglass batts or blankets, and loose-fill cellulose are your best options. Fiberglass is economical, easy to install, and nonflammable. Its downside is that heat is lost through framing.
Loose-fill cellulose provides better coverage than batts over ceiling joists, and is easy to install in the attic. It is, however, a messy, dusty job.
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Laying Fiberglass Batting
If you already have insulation in your attic, run batts over the tops of joists at right angles to the existing insulation. This will cover gaps in the first layer and insulate thermal bridges (heat escape routes) caused by the joists.
Work from the eaves toward the center. Use a plywood platform while working. If the batting you are using is faced, slash it every few inches so it won’t trap moisture.
The floor above an unheated basement or crawl space can also be insulated using fiberglass batting. Fill spaces between floor joists with the vapor-retarder up against the floor. Hold the insulation in place using sturdy wire cut slightly longer than the width of the cavity between joists. Push them into place against the batts every 2 or 3 feet, bowing them upward.
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