Thinking about the deadly pic I come to feel there could possibly be an easy however unorthodox Answer. All of the rot from warm wet air fulfills chilly Wooden is true close to where a vented hip might have averted all and WITHOUT vent chutes.
Thanks, Martin and Stephen. The good news is we have been inside of a predicament where we are able to pause and reconsider, as The brand new felt has actually been positioned, Nonetheless they have not begun installing shingles nevertheless. I'll explore the specific situation With all the contractor once more. I could possibly get him to rethink.
If you decide not to extend the rigid foam above the parts of your roof which have a standard vented attic, your builder (or an architect) can come up with a trim detail that you simply may be able to live with.
The very best solution is to carry out all of the perform directly: rigid foam above the roof sheathing (as advised inside the posting), and fluffy insulation underneath.
Must I address the flat roof like a cathedral ceiling and go with spray foam (or board), fiberglass, and no moisture barrier?
Q. "If I execute the unvented roof as intended and place 4 inches of polysio over the roof deck, can I then use open-cell foam amongst the rafters?"
If you need to generate an unvented insulated roof assembly, you most likely don't desire to disturb the tile roofing. That means that the most ideal insulation can be spray polyurethane foam. Needless to say, the prevailing insulation ought to be removed ahead of you put in the spray foam.
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As The top of our nearby HBA, I've strenuously pointed out that foam in excess of a vented flat roof assembly would not provide the insulation values promised. Some builders have proposed they may only seal and stucco around the stucco vents and remove the ventilation.
In the ultimate summary it reads: "If you're making use of fluffy insulation, you would like two air obstacles: one particular underneath the insulation, and a person higher than the insulation.
I'm opening up my property and putting in cathedral ceilings, I just needed to substantiate my approach given that I obtained second views reading through An increasing number of about it. My initial final decision was to go along with a vented roof system and R38C batts. I study quite a bit about the several procedures and it continue to seems to me that this is the best. Livint in Atlanta GA We've got to cope with each scorching humid summers and cold winters, so humidity Manage is a problem, This is why I feel the vented method is go to the website the greatest. Anyhow, I'm all the way down to the rafters and roofdecking and furred out the present 2x6 with 6" metal studs, so I have about eleven.five" for insulation. Mt system was to make a steady air flow beneath the roofdeck, my issue goes towards to employ baffles, xps board Create baffles or insect screen nailed at furring strips to permit for your airspace.
Doug... For a few rationale I did't see your article #17. Appears like two of us not less than Feel there is likely to be a quite simple inexpensive Option.
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My belief is that the steep you could check here facet of a mansard roof is really a roof. This is very true if the exterior with the sloped assembly is finished with roofing.