Can we (does the code allow it)? Does it make sensible feeling? Are there pitfalls as a result of our weather? How could possibly We've to switch that to fit it to out situation?
Okay, I had been figuring that the overall of your rigid foam + cellulose needed to be a certain R-benefit together and were thinking of working with much less rigid foam. I have been reading about unique types of cellulose. Considering that I am installing from previously mentioned would something like stabilized cellulose function because it has somewhat drinking water added?
This article will go over insulated sloped roofs. The solutions described right here may be used to create an insulated cathedral ceiling over a terrific home, a piece of sloped roof earlier mentioned a kneewall, or any identical section of insulated sloped roof.
The most effective method is to carry out every one of the perform at the same time: rigid foam over the roof sheathing (as proposed within the write-up), and fluffy insulation underneath.
I see the recommendation is always that when beginning with board sheathing, a single must location a watertight membrane above the sheathing just before setting up the lowest layer of foam. Having said that, in my circumstance the roofer has currently concluded putting new felt more than the T&G board ceiling/roof deck. Can that felt substitute for that prescribed watertight membrane, right here in San Jose/Local weather Zone 3?
Martin, re: shifting the attic about the 2nd Tale bedrooms to the conditioned attic and sealing the soffit vents.... Previous to this newest concept about insulating with rigid foam in addition to the cathedral ceiling, we were intending to cut a ridge vent into the gable ridge, in an effort to meet air flow code requirements. Now We have now eave vents plus two relatively useless gable vents, one on each side.
Feels like you may have the framing and roofing in position. Your choices are explained in the short article earlier mentioned--you can increase venting by installing baffles under the sheathing to hold back again the insulation, or you are able to install at the very least R-twenty of air impermeable insulation.
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I am undecided should you are interested within a making science response or a code solution. From a code point of view, that is a roof that should be insulated to R-forty nine.
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We actually don't know if these roofs have appropriate vent channels, or what sort of vent baffles (if any) were used to take care of the air flow hole concerning the very best on the fiberglass insulation and the underside in the roof sheathing.
If you would like set up a combination of closed-mobile spray-foam on the underside in the roof sheathing and air-permeable insulation concerning your rafters — an tactic at times known as “flash and batt†— the setting up code necessitates that spray foam (or, arguably, rigid news foam insulation) be “applied in direct connection with the underside from the structural roof sheathing†and which the foam insulation meet the requirements “specified in Desk R806.
three. Making use of continual Ice & H2o Protect is sometimes risky, but it surely's Alright If you're subsequent the PERSIST strategy and putting all of your insulation on the outside from the peel-and-adhere. The method can perform, but you will need considerably more foam on the exterior of the roof.
The prepare: Element A: I stumbled on 1" Dow rigid foam backed five/8CDX for a similar rate given that the bare CDX, And that i intend to double it up similar to a SIP, putting in The underside sheet foam aspect up and the following sheet on top (staggered of course) with the foam struggling with down, supplying me 2" of insulation between the plywood.