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Ace Roofing Company - Roof Repair & Replacement
Austin, TX, USA
https://aceroofingtexas.com
+1 512-836-7663
Q. "I'm questioning if I should furr out the rafters for getting the specified thickness of spray foam, or if installing a handful of inches of polyiso foam into the underside of your rafters, following the spray foam, could perform?"
Do you know the original source for this Image and if it is achievable to view other photographs of this intriguing failure.
Just because a roof assembly doesn't Keep to the guidelines proven with the building code or recommendations of setting up scientists doesn't suggest the roof has
I've created log homes during the Yukon Territory in northern Canada for thirty many years. Most log structures have cathedral ceilings. The vast majority of roofs we have designed are as follows (from the bottom up): log purloins, nominal 2" (2x6) t&g decking, 6mil poly, one 1/two" extruded polystyrene foam, 2x10 rafters on 24" centers, 7" fiberglass, 2x4 strapping, 7/16 OSB, underlayment (15 lb paper, 30lb felt, or now we might even use ice and drinking water defend). There would be about an inch of air Room underneath the strapping for each vertical and horizontal air move. All roofs are vented with strip vents at the eaves and vents within the soffit (2x6 t&g) at the peak at both equally ends. I'd disagree that venting is not really wanted in the event you quit the airflow on the warm aspect, for two reasons. To start with it really is very difficult to halt all airflow, Specially with typical regular methods (ie chimney and plumbing vent penetrations with the roof) We now have several techniques produced over time to seal the vb in the eaves and gables, but there remain nail penetrations through the vb. Over-all I think we experienced pretty limited seals but one could never say airtight.
Recall: if you decide on to install rigid foam in addition to your roof sheathing, don’t set up ventilation channels roofing company athens ga underneath the roof sheathing; these two tactics are incompatible.
A. That is a gray area inside the constructing code. It can be safe to convey that no professional insulation contractor would use that method, which Many individuals connect with "cut and cobble.
Thanks with the enter. I see a visit with a structural engineer and 35 sq. of polyiso in my near potential.
I checked out the unvented schematics and I'm not guaranteed that matches the Monthly bill for up listed here (Canada - west coast).
If you put in 2x4s (or 2x3s on edge, installed with long screws) perpendicular into the rafters, you'll tackle a lot of the thermal bridging concern without the necessity to add a layer of rigid foam.
If you want to make a ventilated insulated sloped roof assembly, choose a sort of air flow baffle that could be installed in an airtight manner. Web-site-constructed baffles are finest.
Next, can you be sure to affirm this: "In order to use only one sort of insulation in unvented rafter bays, you're limited to spray polyurethane foam."
You are not the only real particular person with this worry. you can look here For many who (like you) are involved about The difficulty, there are two selections:
The GBA website will not provide personalized facts. That's what an architect or an engineer is for; I recommend that you hire one particular.
Bear in mind: Because your roof assembly is dry, doesn't suggest roofing company augusta ga it really is properly insulated. Your assembly might have large air leaks that act as thermal bypasses. (Or not. It truly is hard to notify without a internet site stop by.)