PERSIST with concrete wall?
Longtime listener, first-time caller.
My wife and I are designing a house. We are north of Lake Ontario, climate zone 6, with a downward outlook. We want a simple, housey-house and have settled on a few details:
Slab on grade, FPSF
Polished concrete floors
Single storey, 12-14’ ceilings
Compact layout, 1,200 – 1,800 sq ft
Classic gable roof with healthy pitch
Probably a metal roof of some description, agricultural-looking is fine
Mini split heat pump(s) for heating and cooling with ceiling cassette(s)
I have read a lot on walls and am having trouble converging to a solution.
I want an R value in the cost-sensible zone and was thinking ~R25?
I bought a book on ICFs 20 years ago and am still intrigued. I fear, however, that they are the 3D printer of the building world – the wall of the future and always will be.
I like the solidity of the concrete, however, and read a thread where Martin, I believe, said there was little to no functional difference between an ICF wall and a poured concrete wall with insulation applied.
I appreciate the reuse of salvaged XPS (pet peeve – reuse is not the same as recycling).
To make a short story long, I am wondering if a conventionally-poured concrete wall with sufficient external XPS only, would be functional, or would insulation be required on the inside as well.
Thanks so much,