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Martin, re: modifying the attic about the 2nd story bedrooms to a conditioned attic and sealing the soffit vents.... Ahead of this most recent thought about insulating with rigid foam in addition to the cathedral ceiling, we were planning to Reduce a ridge vent to the gable ridge, so that you can satisfy ventilation code requirements. At the moment We now have eave vents furthermore two reasonably useless gable vents, just one on all sides.
It sounds like you've got an existing roof with tile roofing. I'm guessing that you are crafting from Europe. It appears like the insulation is made of "limited-fitting wood fibre board" among your rafters -- thickness and R-worth are not specified.
To illustrate that a certain developing follow ends in a twenty% failure rate. That observe could be completely unacceptable to builders, who don't want callbacks or complications. But that observe would continue to cause eighty% of customers being contented.
Even so, two other areas of facet-roof have presently been dry walled over with fiberglass in addition to a plastic sheet -- the bathroom closet and also the hallway. I am afraid to inquire but should really I open People up once more?
It can be unquestionably not limited to an R eighty Passive Residence roof. Choose out the parallel chord trusses and thin it up.
an air barrier. If you want to put in EnGard insulation batts within an unvented cathedral ceiling, You will need to have a significant layer of rigid foam insulation previously mentioned the roof sheathing.
Many thanks for finding the thread previously mentioned...Take note that in submit #17, Robert Riversong talks about the "vented above roof". I concur with you that this technique deserves some notice for cathedral ceilings.
In order to Mix air-permeable and air-impermeable insulation, There are 2 feasible approaches to progress. A person option (according to the code) involves: “In addition to the air-permeable insulation put in immediately down below the structural sheathing, rigid board or sheet insulation shall be put in immediately above the structural roof sheathing as laid out in Table R806.five for condensation Regulate.â€
The Threat is the fact inside moisture will migrate to the chilly sheathing, resulting in condensation or dampness accumulation.
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A further problem that will come up in that state of affairs is whether which could advertise condensation about the underside on the one" XPS when it can be cold adequate outside the house because the browse around these guys underside from the XPS could possibly be down below the dew position? Q-three: What to do once we re-roof.
Does it make sense to spray and cut and cobble 4 inch closed mobile foam/board on underside of sheathing followed by fiberglass inside the bays and one inch of eps/iso under the rafter (to stop thermal bridging) just before ending with drywall? Will I develop a vapor sandwich and superior go away the ultimate EPS and settle for the thermal bridging?