It truly is Secure to claim that an existing household does not have good roof air flow if there are not any soffit vents or ridge vents. It's also Risk-free to claim that, even though there are actually soffit vents and ridge vents, the roof isn't ventilated if it incorporates valleys, hips, dormers, or skylights.
I am designing a house and we have been utilizing cellulose in 2x12 roof rafters, and I came across an item that appeared terrific. It really is an insulated nailbase named Neat-Vent by Hunter Panels. It offers up to 25.6 R-price in foam insulation (in thicknesses around 6" which involve a 1" airspace and plywood) whilst supplying a cooling vent under the shingles, and simple set up to the roofing While using the nailbase.
Is it ok so as to add peel-and-stick membrane to pick out parts of the roof and keep The remainder breathable with tar paper?
If the air inside my household was humid unconditioned air, I could well be equally concerned. But is not going to The within air be comparatively dry a result of the on-likely air conditioning? Should really I be concerned out condensation forming on my AC ducts if I cathedralize my ceiling?
I now understand that stucco cannot be applied to a roof, so I will revert for the a steel roof, but nevertheless want to have an unvented attic. I have go through as a result of "Creating a conditioned attic", and am nevertheless not sure concerning The simplest way to commence.
The appropriate solution to progress is to setup rigid foam previously mentioned the roof sheathing. There really usually are not two solutions to this issue. Enough time to carry out the get the job done has become. In the event your contractor will never execute the necessary do the job, you'll need to hire a special contractor.
1. It's usually a bad idea to put in an HRV in an attic. HRVs must be available sufficient to the homeowners to routinely alter the filter.
[Editor's note: Invoice Rose just despatched me the following responses in an e-mail; he involved his permission to post the comments.]
The very best Answer is to address the problem from above, by adding an important quantity of rigid foam earlier mentioned your present roof site link sheathing. You may Develop up the layers by yourself, of You should buy SIPs or nailbase panels.
Thorsten Chlupp is in the Significantly tougher climate and he seems to be doing great with simple loose fill within the attic floor....certainly He's utilizing "sufficient" amounts (cellulose galore)and he has baffles close to the soffit.
"R-19 batts are incredibly air permeable, and on very long unobstructed rafter bays you may have really a stack impact. It won't have a enormous volume of air leakage to supply some drying there. Also, When the batts are unfaced or kraft-faced, the drying toward the interior will be significant.
I'm carrying out exactly the same depth on my new design. I purchased the insulation from David Volpe @ NationwideFoam.com. You will find a place in Framingham, MA. I purchased numerous tractor trailer hundreds to insulate my residence and barn for an exceedingly, quite affordable rate.
My experience is that the dew stage profile would turn out from the XPS foam board, consequently a VB really should be put on initial deck. As a way of assembly:
Must i fully assist sheathing seams parallel on the ridge line, for sheathing earlier mentioned an air hole? Would not that isolate the air beneath Each and every sheet of sheathing, and is that okay?