WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
Your plan will operate high-quality, as long given that the layer of rigid foam in addition to your roof sheathing has an R-value of at least R-twenty. For anyone who is using XPS, you'll need at least 4 inches of foam. Should you be using polyisocyanurate, you require at least three inches of froth.
Like most mansard roofs, your roof is unvented. Your mansard roof has distinct sections -- the steep sections with the perimeter, as well as the small-slope section in the center. All of these sections should be insulated in an identical way, since most of these roof assemblies are unvented.
Here's the standard reply for many who really need to comply with most building codes (The solution originates from an write-up by Mike Guertin):
I'm opening up my dwelling and putting in cathedral ceilings, I just wished to confirm my plan since I acquired second thoughts reading Progressively more about it. My authentic decision was to go with a vented roof method and R38C batts. I read lots about the various solutions and it nevertheless appears to me that This can be the best. Livint in Atlanta GA we need to offer with both equally very hot humid summers and cold winters, so humidity Management is an issue, that's why I think the vented tactic will be the best. Anyhow, I'm right down to the rafters and roofdecking and furred out the prevailing 2x6 with six" metal studs, so I have about 11.5" for insulation. Mt plan was to produce a constant ventilation beneath the roofdeck, my problem goes toward to employ baffles, xps board Construct baffles or insect screen nailed at furring strips to permit for the airspace.
I doubt that the condensation is occurring from the chilly ridge beam. Rather, I believe it is likely that condensation is happening to the underside of your ridge shingles or even the underside on the asphalt felt underlayment.
Indeed a cathedral ceiling element might be pretty identical even so the challenge of many cathedral ceilings will be the added structural components, electrical containers, and like this the need for wood board ceilings all which start compromising the drywall layer which with roofing company business plan your element is employed on the air barrier.
I believe that you might want to submit a sketch. I can not visualize what you are talking about from a description. If you would like put in an HRV in your attic, why do you have to set up a water resistant stucco roof about some sort of EPS box? Is not your attic by now dry? Most attics have roofs.
Even though vented roof assemblies are built to dry to the outside, unvented roof assemblies are designed to dry to the interior. That’s why an unvented roof assembly should really under no circumstances incorporate inside polyethylene.
2. Install strong web-site-constructed ventilation baffles in Each and every rafter bay before you decide to spray the foam. That way you end up with a vented cathedral ceiling.
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More details on how to insulate an unvented roof assembly is delivered from the post on this website page.
In the final summary it reads: "If you are using fluffy insulation, you need two air barriers: just one underneath the insulation, and a person over the insulation.
If you would like put in a combination of rigid foam on top of your roof sheathing and air-permeable insulation in between your rafters, you need to be sure that your rigid foam is thick enough to keep your roof sheathing over the dew place.