While these test results Evidently make sensational marketing copy ("Tests at countrywide lab display fifty% lack of R-price with fiberglass and zero loss with cellulose"), we don't nonetheless know specifically how major they are. The underside line factor is obviously the effect on seasonal Electrical power costs.
You inquire, "Could Icynene be inferring listed here that considering that our solution is undoubtedly an air barrier hence it has inherent Electricity preserving gains that, when combined with their insulation values equate to R-38?"
I guess that my most important concern to everyone seems to be: Why are we preventing and endeavoring to tear down a single brand name or One more, when we should be employing our Electricity to that lofty goal of strengthening the codes.
Any developing Office that, based on Icynene’s arguments, makes it possible for builders adhering to the prescriptive code to setup below the minimal demanded thickness of insulation is failing in its obligation to enforce the code.
I welcome details and I really like area scientific tests. I've claimed the outcomes of area research (as editor of Energy Design Update) for years. But my adore of discipline reports and info isn't going to stop me from thinking or crafting on a concern that doesn't demand a subject review — namely, Icynene's outrageous usage of a letter to encourage regional building officials to permit insulation that fails to fulfill prescriptive specifications.
2. I hardly ever tackled the issue of no matter whether it makes sense to deliver an attic to the thermal envelope of the home, or, if a person chooses to do so, which insulation is finest for insulating between rafters.
Company's propaganda aside (and that's the propaganda from 20 foam companies, eight cellulose suppliers along with a 50 percent dozen fiberglass makers I am speaking about) The existing regular is The existing conventional and you have to fulfill it, flawed or click this link not.
Mainly because for the majority of weather zones,encapsulated attics count on done heat transfer with the ceiling to circumvent wood parts (Specifically the roof deck alone) from achieving dew place (or 45F, as expected by IRC 806.4). See this connection:
Your post is often a reminder that there are robust regional variations in building procedures. I just returned from Efficiency Vermont's meeting in Burlington, the place hundreds of Vermont builders attended workshops on airtightness.
Dependant on the analyze from ORNL I think Ed maybe proper relative towards the effectiveness of fiberglass supplies on a vented assembly. Make sure you give your comments on this review presented your reference to other ORNL research you may have posted and agreed with in earlier blogs?
Martin, I have study many of the articles or blog posts and agree with Significantly of Anything you produce. On this make any difference you're lifeless Completely wrong. I am not an advocate of any foam mfg, I and an incredibly massive proponent of not misleading men and women as you have done With this unique article.
2. It really is disingenuous for Icynene to compare the functionality of its merchandise with competing items set up in leaky homes. It is really now time for you to assume that every one households will probably be crafted with consideration to air tightness.
Mention deception! The R-price per inch of Icynene is about similar to that of fiberglass batt insulation. However the weasly advert copy takes credit history for the excellent R-benefit for each inch of a competing merchandise (shut-cell foam insulation) and indicates that Icynene is equally as excellent.
The very best Electrical power modeling plans (including the Passive Residence Planning Package) consider all three elements when modeling a home's Power efficiency.