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David, you will be correct there isn't a way to match the efficiency of a program i.e general performance of the home by only calculating the thermal resistance of the insulation content. This really is why a house insulated with fibrous resources and standard vented attics won't carry out in the exact same way as a home that takes advantage of foam within the walls and roof line. The situation Together with the industry for some individuals is that they're drinking the kool assist that has been propagated for over 30 years in that the only real measurement of Vitality performance is the amount Rvalue you set in your house. I would Feel a GBA on this weblog could well be somewhat more informed on how a house employs or consumes Electrical power.
I agree. Yesterday I attended Effectiveness Vermont's "Far better Buildings" convention — one of the best regional conferences from the state. Marc Rosenbaum gave an excellent chat on air obstacles. He is attempted them all over time. His preferred is now to utilize wall and roof sheathing as the air barrier.
You're proper, obviously. This full argument— which boils all the way down to "an R-twenty Icynene cap performs much better than an R-38 cellulose cap" — relies on quite a few skewed assumptions, like Icynene's evident assumption that any builder who makes use of cellulose is familiar with very little about air boundaries, and the assumption that folks who use cellulose constantly put in HVAC products and ductwork of their unconditioned attic. These are generally very major assumptions! No analysis scientist would contemplate this comparison valid.
Icynene installers actually need to scrub up their act. I decided (outside of curiosity) to take a look at how Icynene dealers in North Carolina — the point out in which the notorious Viktor Ginic letter is currently being distributed — are internet marketing their solution. The quite 1st Web page I frequented consists of a blatant exaggeration. Here is the Website:
Martin, you might have explained several moments which you under no circumstances made use of the word illegal as part of your description of employing a thing fewer than R-38. As part of your March 7th reaction you say...
You wrote that Icynene's "Main argument is sound. Bigger air tightness will allow go to my site for a lot less R-benefit to complete likewise from an Power reduction point of view in The full constructing."
Notice that the whole theoretical increase in once-a-year Electrical power Charge for Bismarck is just $16.fifty! And for moderate climates like Philadelphia or Washington, there is not any sizeable rise in annual warmth loss.
Thermal and Air Control with the attic flooring utilizes far fewer floor space and may do the job nicely with substantial levels of cost-effective Cellulose.
February five, 2010 Just use fewer? No less than 1 spray-foam maker is informing consumers that it’s completely appropriate to set up significantly less insulation than needed by code.
According to the review from ORNL I think Ed maybe right relative towards the efficiency of fiberglass materials over a vented assembly. Make sure you give your remarks on this study offered your reference to other ORNL scientific tests you've got posted and agreed with in past weblogs?
Several code officers are qualified to interpret most of the documents submitted by foam producers To judge if the proposed foam set up is, actually, Risk-free.
claimed extensively about the ORNL testing that showed that some sorts of loose-fill fiberglass insulation provides a effectiveness dilemma at pretty lower temperatures (well underneath zero).
Take a look at deception! The R-worth for each inch of Icynene is about the same as that of fiberglass batt insulation. However the weasly advert copy usually takes credit for that superior R-benefit for every inch of a competing merchandise (shut-mobile foam insulation) and implies that Icynene is just as great.
I'm accomplishing my best to not audio biased - I am wanting to look at the big photograph listed here. Which means disregarding building codes and concentrating on carbon reductions only.