Can we (does the code allow it)? Will it make useful perception? Are there pitfalls resulting from our climate? How might We've got to modify that to fit it to out scenario?
Code will not feel to apply since it's grandfathered in. It seems like I have to redo the corridor ceiling.
Your approach to install eight inches of rigid foam is a great a person, however you could possibly set up thinner foam when there is a powerful purpose to do so. Needless to say, 8 inches of rigid foam has a higher R-value, and may conduct improved, than a thinner layer.
Thanks Martin - Now I see why my primary system to get a SIPS envelope was so elegantly basic. It seems like min R-ten sprayed under the roof sheathing after which a complete-fill in the bays with batt / fluffy, in addition to a vapor sealed drywall lid can get me the 'very hot' (unvented) roof system the SIPS was through the get go.
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Martin, re: modifying the attic over the next story bedrooms into a conditioned attic and sealing the soffit vents.... Before this most recent plan about insulating with rigid foam on top of the cathedral ceiling, we were planning to Slice a ridge vent into your gable ridge, to be able to meet up with air flow code requirements. At present we have eave vents additionally two fairly ineffective gable vents, a single on both sides.
Companies of soffit vents and ridge vents usually specify The online absolutely free vent place of their items on solution packaging or in specifications out there on-line.
Even though the GBA Site currently has lots of articles on the topic, we continue to obtain Repeated questions on The ultimate way to insulate a cathedral ceiling.
In case the air within my house was humid unconditioned air, I will be equally involved. But won't The within air be somewhat dry as a result of on-heading air con? Need to I be concerned out condensation forming on my AC ducts if I cathedralize my ceiling?
2nd, are you able to you should validate this: "In order to use just one style of insulation in unvented rafter bays, you will be limited to spray polyurethane foam."
I am opening up my dwelling and putting in cathedral ceilings, I just desired to substantiate my system because I got second feelings examining A growing number of about this. My authentic determination was to go together with a vented roof method and R38C batts. I read through go to website quite a bit about the several methods and it nonetheless appears to me that this is the greatest. Livint in Atlanta GA We've to cope with the two sizzling humid summers and chilly winters, so humidity Handle is a challenge, This is exactly why I believe the vented solution is the greatest. Anyhow, I'm down to the rafters and roofdecking and furred out the existing 2x6 with six" steel studs, so I have about eleven.5" for insulation. Mt plan was to make a constant ventilation under the roofdeck, my query goes in direction of to implement baffles, xps board Create baffles or insect monitor nailed at furring strips to allow for that airspace.
Rafters are 2x4, 12/twelve slope, along with the roof is complicated with intersecting ridge traces, valleys and dormers. (Your home originally had a cedar roof. The deck is the traditional spaced fir planks.) As a consequence of the development, there is sort of no potential for receiving enough air ingestion by way of soffit vents. (On top of the structure concerns, you can find difficulties due to the fact every one of the spaces in between rafters in which they satisfy the top plate were bricked in, evidently at time of design). Suitable standard circulation-as a result of underdeck roof ventilation will be hard. After we to start with appeared into this task, the constructing inspector asked us to even now use vent channels (low browse this site cost polystrene was Alright) to capture whichever air flow we could.
I've previously insulated the steep sides of my unvented mansard roof with 6" fiberglass (and I had it inspected), do you endorse read this article I rip that out and use spray or board foam? I've gotten conflicting data on no matter whether to take care of it as a wall or perhaps a roof.
Lots of spray foam roofing contractors in our marketplace are touting their potential boost effectiveness on previous sizzling tar and graveled flat roofs by incorporating 3 to 4 inches of shut cell spray foam. The majority of these aged households are flat roofs joisted with dimensional lumber, with parapets and have stucco vents Slice in to the rim joists.