There is certainly an exception that applies to some sloped ceilings. In line with N1102.two.two, within a household having an insulated ceiling — a house "with out attic Areas," which likely isn't going to implement to catheralized attics utilized to comprise HVAC tools — it truly is permitted to reduce the R-worth of the ceiling down to R-thirty, but only for a location of five hundred square feet or a lot less.
When you are referring to the write-up in Energy Design and style Update, then The solution is Of course, I'm the creator.
The disinformation in the Icynene website is usual: "increasing the insulation from 6" to twelve" offers an extra warmth stream reduction of only two%". It is really astounding that, With all the FTC regulations on R-price promoting, the spray foam marketplace is permitted to get absent with this.
Nevertheless, whether or not the prescriptive code in Carrboro requires a minimum of R-thirty insulation, that does not indicate Icynene is off the hook. Using R-20 insulation would however not meet up with prescriptive code needs, so my objection to your Icynene letter nevertheless stands.
There’s no technique to fathom Icynene’s tangled logic without the need of initially looking at present code necessities for sealing air leaks.
The thermal general performance of the insulation item may differ greatly, dependant upon the talent with the installer. Spray foam may be installed improperly; so can fiberglass batts. A badly set up fiberglass batt has a similar R-benefit it normally had — the R-worth which the producer stories in its literature.
If Icynene is so self-assured they are able to get by with 1/two from the code permitted R-price, they need to be prepared to deliver monitored success for residences insulated with Icynene to show it.
This is an incredibly fascinating dialogue to lurk close to, looking forward to the correct the perfect time to chime in. I am a supporter of spray foam insulation, and I've a reasonably close marriage with Icynene, acquiring applied it on each of the assignments I've crafted or renovated up to now several decades and I often advise it to shoppers.
By Martin Holladay
In that post, I wrote: The uncertainties more than the meaning of highest thickness limitations have been highlighted in the public letter from John Hogan, the senior code enhancement analyst to the Seattle Department of Plan-ning and Enhancement.
So we are all on the exact same website page on air sealing. In Vermont and Minnesota and much of Canada, builders of latest households are executing a number of air sealing techniques for a few years. It should be assumed that these approaches are standard exercise.
I know Every person has their own personal feeling and way of saving Electricity but using this method will work far too. It looks like Many of us on right here and our sector Believe that they are appropriate and theirs is the one way. Is just not it time to be open up minded?
Take a look at deception! The R-worth for every inch of Icynene is about similar to that of fiberglass batt insulation. But the weasly advert duplicate will take credit for that superior R-benefit per inch of a competing product or service (closed-cell foam insulation) and implies go to this site that Icynene is equally as great.
Also, I ponder why you may have preferred to solitary out Icynene on this difficulty. Installers of all manufacturer of foams in my area propose R20 from the roof deck. If you really need to show a real challenge, why not produce concerning the ridiculous statements photo voltaic panel organizations make in lowering energy Price by setting up photo voltaic DHW systems.