To avoid moist interior air from contacting chilly surfaces close to the ridge, You'll need a true air barrier and an actual insulation layer. The proper way to repair this problem is to expose the rafter bays -- either from above or under, It is really your alternative -- and pull out the fiberglass insulation. Put the fiberglass within a dumpster. Then fill the rafter bays with spray polyurethane foam.
If you install 2x4s (or 2x3s on edge, put in with lengthy screws) perpendicular on the rafters, you can tackle many of the thermal bridging worry with no ought to include a layer of rigid foam.
If at all possible, contain a air flow channel higher than the top of your insulation layer. The air flow channel will give low-priced insurance policies in opposition to humidity build-up, and can decrease the prospect of ice damming.
Most professional roof assemblies You should not bother While using the fluffy stuff. They simply meet up with 100% on the R-value demands for the roof with rigid foam (both EPS or polyiso) and skip the batts totally. That is the way I counsel that you commence.
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Martin, re: transforming the attic in excess of the second story bedrooms to your conditioned attic and sealing the soffit vents.... Previous to this most recent thought about insulating with rigid foam along with the cathedral ceiling, we had been intending to Slash a ridge vent into the gable ridge, in order to fulfill ventilation code specifications. At the moment We've got eave vents furthermore two pretty worthless gable vents, just one on each side.
I employed to work as a click here now roofer, and roofs which have been fully coated with Ice & Water Shield make me anxious. I see such a style and design as lazy and probably problematic.
You should definitely install insulation that gives a minimum of the minimal code requirement for ceiling R-benefit. Insulation that exceeds the minimum code necessity is a lot better.
Doug I agree, too many wrongs "overthinking" and overdoing. I once needed to resupply a health care provider making an aircraft with dozens of AN plane bolts as they were being tightened to The purpose of breaking the bolts. Less is a lot more at times... Combined with the KISS rule.
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In the choice, if we will not do a ventless roof that way, can we attain our overall insulation desires by combining the above and underneath deck R-Values if we top rated it all that has a vented over-roof? Thanks for your time and your information! Dan
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It feels like you've an current roof with tile roofing. I am guessing that you are writing from Europe. It looks like the insulation consists of "restricted-fitting wood fibre board" in between your rafters -- thickness and R-price aren't specified.
"When you have mounted the code-mandated thickness of rigid foam over your roof sheathing, you’re absolutely free to put in just as much fluffy stuff as you desire amongst the rafters."