I thanks for this impeccably timed web site, as I am at present framing my semi-simple cathedral ceiling hip roof (with shorter ridge). I want to explain my element and check out to be aware of where I am on the best monitor plus more importantly, exactly where I can have failures. Hope I can amuse many of you...I feel similar to the extra I try to address a concern, the more of a concern it turns into, And that i unquestionably don't need to choose excellent time, treatment, and depth to aid the demise of my roof.
If a creating inspector insists that you put in some type of interior “vapor barrier,†you can normally put in a smart vapor retarder like MemBrain to fulfill your inspector.
With This technique , there isn't any issues with a complete peel-stick roof underlayment on top of the deck is there? I've a metal roof on this project plus the underlayment is going to be absolutely adhered to the roof sheathing.
Also, Why don't you zip panels taped after which roxul batts with drywall about that. Roxul is great things I have already been testing For a long time in crazy ways endeavoring to see its skills. I are convinced zip panels, taped correctly, with roxul batts will very last given that the roof!
Sure It is lots of problems. It appears like fewer issues that the element posted as illustration from the blog previously mentioned and employs no foam... Which is a "biggie" for me.
A. It makes sense for you since it fulfills your preferences. As that you are knowledgeable, it isn't an excellent technique to insulate your roof assembly. But you've explained it as A brief prevent-hole evaluate.
I've heard a lot of stories of homeowners with problematic SIP roofs installed within the 1980s -- Many of these roofs are actually rotting in the seams due to condensation of dampness from exfiltrating inside air -- to experience snug recommending a SIP roof.
Many thanks for finding the thread over...Take note that in put up #seventeen, Robert Riversong talks concerning the "vented in excess of roof". I concur along with you that this method warrants some interest for cathedral ceilings.
Set up a layer of shut-cell spray foam versus the underside from the roof sheathing, and fill the remainder of the rafter cavity by having an air-permeable insulation. Once more, such a assembly is intended to dry to the interior, Hence the assembly ought to wikipedia reference hardly ever include an interior polyethylene vapor barrier.
Our Cost of Residing Calculator is a powerful Resource which will help you make big daily life conclusions. Listed here are just a few thoughts our calculator can respond to, no matter whether you're moving, altering or commencing a vocation or just Discovering the data:
Other than inquiring you audience for an evaluation of my plan, I've A different issue introduced about by fears expressed by a neighborhood builder. He is worried that after the AC ducts are inside the conditioned House which the ducts are going to be liable to sweat and can drip throughout my home furnishings.
to put in vent channels amongst the highest of your rigid foam and the top layer of roof sheathing. I never ever reported that it had been necessary
Situation much like Eric, previously mentioned. If shut cell foam is sprayed or "cobbled" from xps, do It's important to fill your complete Area, or only to thickness for wanted R value?
If We'll set some insulation above the ceiling, then I desire to put The many insulation higher than the ceiling, and stay away from the Value and headache of a different reduced ceiling. Which means a Create-up of eight", applying XPS. If we Establish up the roof line earlier mentioned the cathedral ceiling with the relatives area by 8", we presumably need to build up the rest of the adjoining gable roof also.