Celotex is just a ridged insulation so if that s all you have on your walls under the masonite then my recommendation is to remove the celotex as we ll and install plywood osb.
Celotex under siding.
The lower level has 2 in of xps rigid foam insulation on the interior walls.
So i was just was reading back to your original post and you stated that you have no plywood osb.
The studs conduct more heat than the insulation between them.
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My research seems to indicate that the foam board product is waterproof.
Insulation roofing and building materials asbestos trust.
Since i am doing this predominantly myself i of course have to be cognizant of the weather while things are exposed.
And even though some manufacturers call it rigid foam insulation for the purpose of vinyl siding it basically has the same insulating value as a piece of plywood.
We will be residing the cabin this summer and are wondering if adding 1 inch of xps rigid insulation on the exterior walls and walk out will cause any moisture issues.
Then you ca nee install the celotex and then new siding.
The panels provide a continuous energy efficient surface.
Would it be better insulation if i remove the celotex and use a 1 foam board instead.
All it does is give you a flat smooth surface to properly nail your vinyl siding onto.
The upper part of the cabin has standard batting and no form of exterior insulation under the siding.
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Hardie plank recommends a maximum of 1 of foam board celotex type material under their lap siding so the 1 2 foam and 1 2 celotex would be fine.
Insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding.
I m going to be removing all of it and putting up new zip system sheathing and then new vinyl siding.