WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
My experience is that the dew stage profile would end up from the XPS foam board, as a result a VB need to be placed on 1st deck. If you want of assembly:
Most commercial roof assemblies don't trouble with the fluffy stuff. They just satisfy one hundred% of your R-worth requirements for that roof with rigid foam (possibly EPS or polyiso) and skip the batts solely. That's the way in which I advise that you commence.
We are already lately setting up many closed cell foam directly to the roof sheathing with terrific effects. On the other hand I ponder Should you have read about what takes place when the inevitable roof leak occurs?
Can we (does the code let it)? Does it make practical feeling? Are there pitfalls as a consequence of our climate? How could possibly Now we have to change that to suit it to out problem?
As The pinnacle of our neighborhood HBA, I have strenuously pointed out that foam around a vented flat roof assembly does not provide the insulation values promised. Some builders have proposed they could merely seal and stucco about the stucco vents and eradicate the ventilation.
Thanks Martin - Now I see why my initial plan for a SIPS envelope was so elegantly straightforward. It appears like min R-ten sprayed underneath the roof sheathing after which a full-fill from the bays with batt / fluffy, and a vapor sealed drywall lid can get me the 'scorching' (unvented) roof method the SIPS was from your get go.
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When you are selecting to build a vented roof assembly, don’t fail to remember to incorporate soffit vents and ridge vents.
2. Whenever you put in fiberglass that site batts, air barriers are much more important than vapor important source control. You'll need a good air barrier on each side of your fiberglass batts.
I've a mansard roof with steep sides with gables, and also a nearly flat top with a rubber roof. There won't be any vents, it hasn't been insulated before I started engaged on it and have 2 questions:
Dan Reams, many thanks for your personal opinions. I also are now living in snow region near Yellowstone Nationwide Park. I often have properly above three ft of snow on my cathedral roof. I believe the dew position is frequently in the snow in lieu of from the roof. The R worth of the snow is frequently near the R value of the roof. This may lead to huge ice dams. A simple thermal analysis exhibits that You can not place a simple degree of insulation inside the roof to avoid the ice dams and go the dew helpful hints level in to the roof.
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