Recommended R-Value for insulating finished attic?

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Old 11-13-03, 10:18 AM
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Recommended R-Value for insulating finished attic?

We bought a Bungalow style home a little over a year ago. The upstairs is a finished attic with a bedroom, small den and front unfinished room above the porch. When we had the home inspector come and look at the house he recommended additional insulation and replacing some of the older insulation.

There is absolutely no insulation on the back side of the walls. There is also insulation on the underside of the roof in some areas too which I was informed was unnecessary and not needed. Also appears some of the insulation is a white cotton material which appears to be crumbling. There is also some pink insulation which appears to be somewhat newer but not much.

During the winter the upstairs is ofcourse freezing and during the summer it is sweltering. Should I add insulation to the back side of the walls? Will adding insulation only make it hotter during the summer months? Should I get rid of the older insulation? Is insulation necessary on the underside of the roof? Any recommended R-Value? Thanks for the help.
 
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Old 11-13-03, 03:14 PM
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Unless the old insulation is wet or otherwise ruined, I cannot imagine why it would be prudent to discard it. Insulation in a regular house does not go on the underside of the roof, it goes on the attic side of the ceiling. There should be a vapor barrier between the insulation and the living space.

You can add to your existing attic insulation by adding batts or blowing loose insulation.

Insulation in the walls can be a good addition to your house. Insulation can be added to the walls by blowing it into the cavity in the wll between the studs and wall surfaces.

Providing the requested information on this web page will show you the recommended R- value of insulation that is appropriate for your house.

http://www.ornl.gov/sci/roofs+walls/calculators/rvalue/

Insulation keeps the cold out and the heat in. Similarly, it keeps the heat out and the air conditioning in.

Be careful when working in the attic or other elevated location. Falls are a common cause of serious injury and death. Electrical wiring may be readily accessible in an attic and may pose the risk of electrocution. Working with insulation or other materials that may develop an airborne component may present a hazard to your health and others who occupy or may occupy the building . Insulation and other friable materials may cause an unpleasant reaction by the skin if contact occurs. Be careful when climbing up to and down from elevated surfaces. Be sure to read all warnings and label provided or required to be provided with any tools, equipment, or materials that you may purchase, store, or use. Material Safety Data Sheets are available from vendors of the products, so that you may learn about the constituent materials and assess any risk.

Hope this helps.
 
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