When you are building a cathedral ceiling, the biggest air-barrier blunder is to setup tongue-and-groove boards as your end ceiling with no 1st setting up taped gypsum drywall. A board ceiling is notoriously leaky, and such a ceiling is frequently connected to roof sheathing rot.
I'd personally considerably respect suggestions from experts: bite the bullet and possibility of spray foam insulation, or send out the builders back again up about the roof in December to cut ridge and soffit vents?
With This method , there is not any issues with an entire peel-adhere roof underlayment along with the deck is there? I have a metal roof on this task along with the underlayment is going to be thoroughly adhered into the roof sheathing.
I have read too many stories of homeowners with problematic SIP roofs installed while in the nineteen eighties -- Many of these roofs at the moment are rotting in the seams because of condensation of moisture from exfiltrating interior air -- to truly feel comfy recommending a SIP roof.
A fresh standalone direct vent gasoline stove is going in for the considerably conclusion in the space under the metallic box. I figure if we use XPS board, it would need to be pulled back many inches from about that spot, but I didn't Imagine it will avoid me from using XPS totally. Looks like Roxul is significantly less of an issue with regard to heat/fireplace.
Be sure to put in insulation that gives a minimum of the bare minimum code requirement for ceiling R-benefit. Insulation that exceeds the minimal code requirement is better still.
A. It is sensible to you personally as it fulfills your needs. As you will be conscious, it isn't a really perfect way to insulate your roof assembly. But you might have explained it as A brief prevent-gap evaluate.
Many thanks - That is new construction, I am the designer / builder, and the more I check out it, you can look here I am liking all rigid - significantly less fussy. The top layer of rigid above fluffy makes my eave much too thick anyhow. The air barrier for your T&G ceiling is actually the sandwich of felt and taped three/eight" CDX.
If they had been venting the dryer inside (code violation?) and possess an connected greenhouse I wager the walls are moldy way too. Commence in the laundry room with its best dampness position supply "dryer".
Q. "The air barrier is always to be put previously mentioned the pine T&G ceiling and below the foam. Would you recommend that we use one thing that's both equally an air barrier in addition to a vapor barrier?
Your system to setup a stack of rigid foam rectangles in Each and every rafter bay is called the "cut-and-cobble" way of insulation. It is a method frequently picked out by homeowners, but hardly ever chosen by insulation contractors.
The strategy is to install it (from The within of the house) concerning the exact time the drywall is put up. I'll instruct my crew to make sure there won't be any air pockets within the purlin cavities & no air stream into your latter.
I've created dense-packed unventilated roof assemblies quite a few situations without issue. Of course I have never torn into them possibly. I would want to see far more samples of failures in These types of assemblies whenever they're out there.
Should I use airtight baffles or not, I don't see a means to have dampness escaping in the assembly with airtight baffles, fiberglass and xps on the inside, whatever the dew stage are going to be inside this assembly and possibly make condensation that can't evaporate without the need of air flow.