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I may even freely confess which the increasing acceptance on the unvented attic design approach Positive aspects spray foam producers and installers mainly because our merchandise are notably suited to this software.
If you're referring for the post in Electrical power Design and style Update, then the answer is yes, I'm the author.
Icynene has seized on this point — The point that lax code enforcement has inspired the proliferation of leaky homes — to put forth the astonishing proposition that Icynene-insulated residences can perform inadequately, far too.
Icynene installers actually need to scrub up their act. I made a decision (outside of curiosity) to look at how Icynene sellers in North Carolina — the state in which the infamous Viktor Ginic letter is getting dispersed — are marketing their product. The quite very first Internet site I visited incorporates a blatant exaggeration. Here's the Internet site:
3. You've got said that my post is full of misinformation. If that is so, I invite you to cite an illustration of misinformation.
"Concerning the R38 ceiling vs R20 roofline insulation, I've noticed excerpts within the similar analyze that Jan outlined (If any one has the whole review, I would like to see it) concerning degradation of Rvalue of unfastened fill insulation in chilly weather conditions resulting from convective currents inside the solution by itself. That would suggest to me that because it receives colder, the R20 from the roof will approach, and inevitably exceed the overall performance with the R38 in the ceiling when chilly.
If Icynene is so assured they will get by with 1/2 from the code authorized R-value, they must be inclined to provide monitored effects for houses insulated with Icynene to establish it.
Unvented roofs are way a lot better than vented obviously. I've created these types of with Icynene... five" sprayed encapsulating truss constructions.
It's doable the whole explanation for encouraging installations no thicker than five" would be that the merchandise has not been examined for flame and smoke at any thickness besides five". Declaring five" is sufficient for Strength conservation could be considered a dodge to avoid questions on code compliance.
In that posting, I wrote: The uncertainties over the this means of utmost thickness limitations have been highlighted inside of a public letter from John Hogan, the senior code advancement analyst for the Seattle Division of System-ning and Development.
The solution is: the trouble primarily fears the limitations in the test gear. Nonetheless, just one specialist I interviewed mentioned that some spray foam manufacturers have only had their foams analyzed up to 2 inches (utilizing the ASTM E84 take a look at) as the foam can't pass official website at four inches -- Despite the fact that the equipment can certainly test 4 inches of foam. Here is more details from my report within the April 2008 difficulty of Electricity Layout Update
Sure, the warmth movement via R38 is forty seven% a lot less than by way of R20. For those who apply R38 for the roof deck, You're not lowering the heat move through the ceiling by forty seven%. The attic functions to be a buffer zone. The question is forty seven% of what, and at what Charge. David Butler
The sensational discovery: Free-fill fiberglass attic insulation may possibly shed approximately fifty% of its effective R-value at really cold temperatures because of air convection (see EDU, October 1991).
- air sealing to prevent convective losses, causing new losses of 500 BTU over period X (this enhancement is substantial in present developing inventory due to latent warmth)