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Cellulose Insulation Getting the real value of your R-Value |
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Many people do not realize that the R-Value or thermal performance of batt and loose fill insulations often vary according to weather conditions. This is due to several factors other than the total stated R-Value of the insulation.
The factors that play a major role in thermal performance of insulation are: - ability to prevent air infiltration in the smallest gaps and crevices - ability to reduce air infiltration within the insulation material - how much convective flow (heat transfer) occurs within the insulation material - thermal mass of building components - thermal bridging across the building envelope
According to independent studies, the thermal performance of cellulose insulation is not as effected by the above factors because cellulose has a higher density
An Oak Ridge National Laboratories' study found cellulose insulation maintains its R-value more consistently than blown fiberglass, despite all factors, even in the harshest of weather conditions.
Source: 1991 Oakridge Laboratories' Study
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