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2011-01-05 17:55:01
Attic Insulation Can Save You Big!

Attic Insulation Saves You Money

By: Jeanne Huber

Published: September 21, 2010

Add attic insulation to lower heating and cooling costs by as much as $600 per year.

 

Do you need more attic insulation?

A good, quick way to check if you need insulation is to look across your attic floor. If the existing insulation comes up just to the tops of the joists, then you probably need to add insulation. If you can’t see the joists and the insulation is well above the tops of the joists, you’re probably okay and you won’t recoup the cost of adding more.

Types of attic insulation

Add insulation to your attic one of three ways:

Roll-on or blanket-type insulation comes as rolls of fiberglass batts, either 15 or 23 inches wide—designed to fit between the width of typical framing. If your attic already has some insulation in the attic floor, roll out the batts at right angles to insulate over the framing members.

If you’re doing the job yourself, blanket-type material is easiest to work with. Be careful not to compress it or it won’t be as effective.

Loose-fill or blown-in insulation requires a machine that shoots a stream of loose-fill cellulose over the existing attic floor framing. This is typically a job for an insulation contractor. The advantage is that loose-fill insulation does a great job of filling in small crevices and other hard-to-reach areas.

Sprayed foam polyurethane is a good choice if you plan to turn your attic into a finished room. In that case, you’ll want to insulate the roof—not the floor. Sprayed foam polyurethane molds to rafters, blocks water vapor, and has a high R-rating per inch. Expect to pay about double the per-square-foot cost of roll-on and loose-fill insulation.

How much attic insulation is enough?

To determine how much to add, look up the recommended amount for your area, then subtract the value of your existing insulation. If you don’t know, you can figure it out using the Home Energy Saver online energy audit tool.

Jeanne Huber is the author of 10 books about home improvement and writes a weekly column about home care for the Washington Post.

Visit houselogic.com for more articles like this.

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