Having a well-insulated and air-sealed home is essential to comfort, affordability, and sustainability. When our Home Energy Performance Division conducts home energy assessments, the insulation and air-sealing of most homes are often found to be seriously insufficient. Efficiency improvements like insulation are typically the most cost-effective way to reduce energy usage and costs and improve the comfort and safety of your home. They are also necessary if you want to consider renewable heating systems in the future.
Not all insulations are created equal. Traditional insulations like fiberglass actually allow air to pass through them quite easily and are given their R-value rating in a 70-degree no-wind test environment, which is very different from the real world. In our experience, we have found spray foam insulations to be the most effective at stopping air infiltration and providing a good conductive and convective barrier.
This is the most common insulation and the least effective. The R-value of any fiberglass product should be down-rated to its actual effective R-value when air movement is taken into account.
This is another common insulation, especially for walls and attic flats. It, however, is also not a very effective air barrier, and also tends to shift once in place, especially if not dense packed and in walls. Like fiberglass, but not to the same extreme, the R-value of cellulose should be down-rated to calculate its actual effective R-value. The most effective form of cellulose if it must be used, is high-density cellulose when blown into a wall cavity.
We have found spray foam to be the best insulation for most applications. There are several types of spray foams, and they are primarily categorized by chemical composition, density, and cell structure type (which affects rigidity and moisture properties).
We have had excellent experience with the Demilec products, including the Heatlok Soy closed-cell 2 lb foam and the Sealection Agribalance open-cell 0.7lb foam.
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