Inevitably, producers started supplying stiffer options that are improved ready to resist the pressures of dense-packed insulation. These merchandise occur and go, and many are no longer obtainable.
Doug I concur, too many wrongs "overthinking" and overdoing. I after had to resupply a doctor building an aircraft with dozens of AN plane bolts since they ended up tightened to the point of breaking the bolts. Much less is a lot more from time to time... Together with the KISS rule.
A lot of spray foam roofing contractors within our market place are touting their means make improvements to efficiency on aged incredibly hot tar and graveled flat roofs by including 3 to 4 inches of closed mobile spray foam. A large number of aged households are flat roofs joisted with dimensional lumber, with parapets and also have stucco vents cut in to the rim joists.
Air flow channels are designed by setting up a fabric that can manage a separation (an air hole) amongst the insulation plus the roof sheathing.
Q. "If I switch the felt with Ice & Water Protect or a similar asphalt-based mostly item, I would likely just be jumping with the fireplace into the frying pan, odorwise. This is certainly foremost me to imagine that the Solitex or Delta goods will be far better."
Energy codes build least R-worth needs for roofs and ceilings. There are lots of possible code compliance paths; most builders select the prescriptive path, which sets forth bare minimum R-values for roofs and ceilings within a prescriptive table.
I thanks for this impeccably timed weblog, as I am now framing my semi-primary cathedral ceiling hip roof (with short ridge). I would like to describe my depth and check out to be familiar with where by I am on the right keep track of and much more importantly, the place I can have failures. Hope I'm able to amuse some of you...I come to feel such as more I consider to deal with a concern, the greater of a concern it results in being, And that i surely don't desire to take wonderful time, care, and element to aid the demise of my roof.
You describe your proposed air barrier official source as "taped felt." I do not Imagine asphalt felt is usually properly taped, and I don't believe asphalt felt would make an excellent air barrier.
"Once you have put in the code-mandated thickness of rigid foam above your roof sheathing, you’re free of charge to set up as much fluffy stuff as you want between the rafters."
Q. "The air barrier is usually to be placed earlier mentioned the pine T&G ceiling and under the foam. Would you endorse that we use a thing that's both of those an air barrier plus a vapor barrier?
The GBA Internet site will not offer custom made particulars. That is what an architect or an engineer is for; I propose you seek the services of one particular.
You might be describing a cathedral ceiling that includes all achievable errors. There was no interest to air sealing. The worst achievable insulation was applied (fiberglass). Plus the roof assembly is unvented. So it's no surprise that you'll be seeing condensation.
Should the air inside of my home was humid unconditioned air, I could well be equally anxious. But won't the inside air be rather dry mainly because of the on-likely air conditioning? Should really I be troubled out condensation forming on my AC ducts if I cathedralize my ceiling?
This text was Very useful, Thank you! I've one particular dilemma about creating a vented assembly by making an airtght program with accuvents.