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The Icynene Insulation System
We built a new house and used this system. So far it is performing very well.
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The Icynene Insulation System
There seems to be some confusion about these insulation systems. Icynene is a brand name. It is an open celled foam. Open celled foams have an R value of 3.6 per inch. There are also closed cell foams being used. These have an R value of 7 per inch. The way you tell the difference between the two is open celled foam is soft like a pillow and closed cell foam is hard. Fiberglass insulation has a claimed R value of 3.7 per inch. Foams claim to fame is that it expands into every nook and cranny of the building and virtually stops all air infiltration. Closed cell foams are usually much more expensive than open celled foams. Foam expands greatly upon application (100:1). The R value is determined by the amount of material the installer places in the cavity. Typically an Icynene insulation quote will be 3" in the walls and 5" in the ceiling. To achieve a R-39 value in a ceiling approximately 11" of foam would have to be sprayed. I think that if you question the installer he would be more than likely spraying 5-6" of foam and claiming it performs better than R-39 of fiberglass.
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The Icynene Insulation System
If there is a leak the foam will not absorb water. Your sheathing will not rot because there is there is no water vapor or air infiltration that gets past the foam. You also will not need house wrap. What causes roof shingles to fail is when there is a wide temperature differential between the outside and inside of the shingle. The foam prevents this. We foamed all the interior bathroom walls and any walls that have plumbing drains. This greatly aided in keeping these areas isolated noisewise from the rest of the house.
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The Icynene Insulation System
It's a type of foam thats used for insulating houses. It's sprayed into wall cavities as a liquid and expands to fill them.
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The Icynene Insulation System
Foam is not a do it yourself project. I would think you would be in the $1.50 to $2.00 a square foot range
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