Choosing a bad spray foam contractor in Oregon could cost you a lot more money than you think. Make sure you get the right advice from a trusted and reputable spray form contractor. The cost of re-installing spray foam insulation will be costly, make sure you make the right decisions from the start. Following the guidance on the thickness of the spay foam backed up by research and data.
Some companies in Oregon are recommending 2” on the roof deck – here in the Northwest we know that it takes 3” to eliminate the dew point. The minimum installed thickness of Closed Cell Polyurethane Spray Foam Insulation is 2” closed cell spray foam in the walls and 3” closed cell spray foam under the roof.
Above is the Heat Flow Reduction chart that illustrates why there is no need to install any more than 3” closed cell spray foam. This amount provides a heat flow reduction of 96%. If we double that thickness, the heat flow only goes up a little over 1% which equated to an almost immeasurable/insignificant amount of energy savings. This is the diminishing rate of return of foam and why we only recommend 2” closed cell spray foam in the walls (94% heat flow reduction) and 3” closed cell spray foam under the roof.
While you will receive a 94% heat flow reduction with only 2” of closed cell spray foam insulation, we recommend a minimum of 3” under and roof deck or in any attic assembly.
This is due to 2 factors:
We are the #1 leading spray foam insulation company in Oregon — and not just that, we service the Oregon Coast, as well as inland areas as well. We love supporting Oregon’s diverse businesses. Call us today for any advice on Spray Foam Insulation or information on the cost of re-installing spray foam insulation.