ask this old house videos Understanding Insulation and R-Value | Ask This Old House

Ask This Old House general contractor Tom Silva explains R-value and the need for good insulation. (See below for tools and steps.)
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Tools for Understanding Insulation and R-Value:
- Tape measure

Steps for Understanding Insulation and R-Value:
1. Tom defines R-value as the resistance of heat transfer through the insulation—meaning, the better the R-value, the less heat is lost.
2. When it comes to R-value and recommendations for your home, a lot depends on where you live.
3.In southern parts of the United States, the recommended R-value for a roof is R-30; for the middle of the country R-38; and farther north, R-49 is strongly recommended, as the climate becomes colder.
4. One way to calculate the R-value of existing insulation is to measure it with a tape measure. Place the tape measure down and touch the ceiling board to get the height. For most insulations, including fiberglass and cellulose, every inch of insulation is roughly equal to an R-value of 3.5.

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we're ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O'Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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Understanding Insulation and R-Value | Ask This Old House
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ask this old house videos Understanding Insulation and R-Value | Ask This Old House
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