It seems if one have been to employ dense pack cellulose in a vented cathedral ceiling the vent channel product ought to be rigid enough to resist the stress.
It appears like you posted your queries on two distinct webpages. I have furnished a solution on the opposite webpage where you posted. Here's the connection to my solution:
If you need to develop a conditioned attic, this informative article tells you what you have to know. To find out more on The subject, see Making a Conditioned Attic.
This article will examine insulated sloped roofs. The approaches described listed here can be used to create an insulated cathedral ceiling over an awesome space, a section of sloped roof over a kneewall, or any related part of insulated sloped roof.
Thanks for the feed-back. We won't ever A/C the setting up (It's going to be solar powered). The wind is pretty constant, however it is a humid ecosystem, so dampness Command is unquestionably on my head.
3. Applying constant Ice & H2o Shield is sometimes risky, however it's OK If you're pursuing the PERSIST tactic and Placing all your insulation on the surface of your peel-and-stick. The method can operate, but you may need a lot more foam on the exterior of your roof.
If you want to use rigid foam, the most beneficial destination to set it is actually on top of your roof sheathing, not under your roof sheathing.
sips are fantastic but from the coldest of climates they have got encountered issues. google challenge purposes in alaska - evidently a bunch of homes there have been constructed although not more than enough attention to element for that plumbing and roof vents were taken into account (Totally air restricted foamed in penetrations), mated panel seams and fastener punctures caused the highest level osb to rot. Obviously The full roofs essential substitution.
I need to promote Price tag-helpful efficiency in my current market, but not on the price of roof failure. We're a 5B local weather zone with 6000 HDD, heating from mid-Oct to mid-April. We are very dry at 7000 ft higher than sea level.
For instance that a particular building exercise ends in a 20% failure level. That practice will be fully unacceptable to builders, who don't want callbacks or complications. But that practice would nonetheless end in 80% of shoppers remaining pleased.
Thanks for that confirmation and advice. Since every little thing is dry this time of 12 months and the house was a short while ago tented for termites, I'll insulate through the beam and seal up the apparent air entryways. Once I can see inside I believe I will have a greater concept the amount humidity is in there through the years.
The simplest way to carry on would be to pick a far more vapor-permeable sheathing product -- a little something like fiberboard.
To avoid moist inside air from calling cold surfaces close to the ridge, You'll need a authentic air barrier and a true insulation layer. The ideal way to fix this problem is to expose the rafter bays -- possibly from above or underneath, It truly read this post here is your preference -- and pull out the fiberglass insulation. Set the fiberglass inside of a dumpster. Then fill the rafter bays with spray polyurethane foam.
2nd, can you remember to validate this: "If you wish to use just one type of insulation in unvented rafter bays, you are restricted to spray polyurethane foam."