A. There's a code requirement for just a vapor retarder in some different types of assemblies, but there's no prerequisite for any vapor barrier. Your layer of rigid foam is now a vapor retarder. No additional vapor retarding layer needs to be put in.
If We will set some insulation over the ceiling, then I would like to set ALL the insulation earlier mentioned the ceiling, and stay away from the Price tag and trouble of a whole new lowered ceiling. That means a build-up of eight", using XPS. If we Create up the roof line higher than the cathedral ceiling from the family place by eight", we presumably want to develop up the remainder of the adjoining gable roof also.
So the dilemma is: seal the stucco vents and include the spray foam roof and Don't fret about condensation? You can find little or no reduced-hanging fruit within our form of construction, Specifically on current properties, Which explains why consumers are getting sucked into the spray foam roof rip-off.
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I previously sprayed and Lower cobbled four inch of closed mobile. I will redo the roof upcoming calendar year, but I assume now it is too late to consider eps/iso in next addition to roof considering that i currently unvented the attic.
Sure a cathedral ceiling detail will be extremely comparable even so the obstacle of many cathedral ceilings is definitely the added structural features, electrical containers, and the need for Wooden board ceilings all which commence compromising the drywall layer which in your depth is employed in the air barrier.
You aren't the one particular person using this type of issue. For many who (like you) are concerned about The difficulty, there are two decisions:
Make sure to put in insulation that provides at the least the bare minimum code need for ceiling R-benefit. Insulation that exceeds the minimum code need is even better.
U.S. developing codes never have to have the use of interior vapor limitations, even in chilly climates. Whatever they do call for is definitely an inside vapor retarder. This necessity read what he said is usually content with kraft dealing with on fiberglass batts or vapor-retarder paint.
Needless to say, you can expect to however have thermal bridging in the rafters. But you won't have any humidity troubles.
Having said that, two other parts of aspect-roof have currently been dry walled about with fiberglass and a plastic sheet -- the toilet closet along with the hallway. I am fearful to ask but must I open People up again?
I need to properly insulate my cathedral ceilings and was wondering to spray 2 inches of closed cell foam to sheathing, then fill with dense packed cellulose. I am questioning if I can connect craft paper and pine paneling for the 2x8 get more rafters and then fill the bays with cellulose.
three. Making use of ongoing Ice & H2o Shield is sometimes risky, nevertheless it's Alright Should you be next the PERSIST strategy and Placing your whole insulation on the outside of the peel-and-adhere. The method can perform, but you would like considerably more foam on the exterior of your roof.
Thanks for your personal advice, Martin. Environmentally friendly Setting up Advisor has become the ideal for answering specific queries I've experienced with the basement the many strategy to the roof. I wouldn't have the ability to build my very own residence solo like this devoid of you together with other viewers helping me out with details.