These insulation values are minimums. Typically, the cost of adding a little extra insulation is minimal once a contractor is on site.
For wall insulation, most are limited in the amount of insulation in the walls because the thickness of the wall is already determined. Methods of filling walls, such as dense packing, tube filling, wet blowing, or using certain types of foams
can improve the overall R-value, and you should discuss these options with a contractor. Ask your contractor to check the wall to make certain the existing insulation has not settled. If you’re not certain if the walls have insulation, the contractor can also check by accessing the walls near electrical outlets. This should only be done by a trained professional.
* Note: Crawl spaces can be a moisture source and proper crawl space design is essential for good indoor air quality.
For more information on mold visit the following web sites:
- http://www.crawlspaces.org">www.crawlspaces.org
- http://www.eeba.org/resources/consumer/mold.htm">www.eeba.org/resources/consumer/mold.htm
- http://www.buildingscience.com">www.buildingscience.com
- http://www.schs.state.nc.us/epi/oii/mold">www.schs.state.nc.us/epi/oii/mold
- http://www.AdvancedEnergy.org">www.AdvancedEnergy.org
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