WDR Roofing Company Austin - Roof Repair & Replacement
Austin, TX, USA
It appears like you've got an present roof with tile roofing. I'm guessing that you are composing from Europe. It looks like the insulation contains "restricted-fitting Wooden fibre board" amongst your rafters -- thickness and R-benefit aren't specified.
If you wish to pick a cloth that is usually a little bit extra vapor-permeable for your personal air flow baffle, it is possible to -- as an example, lots of people use thin plywood or fiberboard in this location -- but you actually do not have to. The EPS will get the job done
Over the summer, roof ventilation does not significantly decrease the temperature of asphalt shingles or other sorts of roofing.
Your proposed assembly is often a code violation. If you need an unvented roof assembly, you should hold the roof sheathing heat with spray foam or rigid foam. Cellulose insulation is classed being an air-permeable insulation and can't be used in this type of roof assembly.
A. This is a grey area inside the developing code. It really is Secure to state that no commercial insulation contractor would use that system, which Many individuals call "Slice and cobble.
You happen to be proposing an uncommon approach to insulating your roof. If I comprehend you accurately, you want to put in EPS in between the tops of one's roof trusses along with your roof sheathing.
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Nonetheless, in a few areas of the region, specifically in the Northeast, insulation contractors are actually dense-packing unvented rafter bays with cellulose For many years. As the technique has deep roots in New England, quite a few building inspectors accept such installations.
My advice will be to seal the present vents. If insulation contractors as part of your area are putting in three to four inches of closed-cell spray foam earlier mentioned the roof sheathing, you won't need to be concerned about condensation or moisture accumulation within your sheathing.
It is definitely not limited to an R 80 Passive Residence roof. Choose out the parallel chord trusses and slim it up.
At some point, brands commenced giving stiffer alternate options that are much better able to resist the pressures of dense-packed insulation. These goods arrive and go, and a lot of are no longer available.
If you would like a vapor-permeable product that continues to be an air barrier, pick fiberboard sheathing. But use caulk around the perimeter, and tape on the seams, investigate this site To make certain that the fabric is set up within an airtight way.
Then put your Standard Contractor or Roofing Contractor in touch with you could try here us to get your metal roofing components and be assured that you'll have a quality long-Long lasting metal roof that will look wonderful!
The R value of your cut'n'cobbled foam + exterior foam should be at least forty% of the center-cavity R price for dew point Command at the foam/fiber boundary in zone 5. If It is really developing a bit shy of that prior to incorporating the exterior foam it isn't an enormous deal from the temporary, but when it'll be 5-a decade just before re-roofing to lift the foam-R to previously mentioned forty% of the full It is worth using vapor barrier latex primer around the gypsum board, or a smart vapor retarder between click here to read the gypsum board & fiberglass.