I have bought an older house with a carport and a freestanding shed that were added a few years ago. It feels solidly built with a membrane between the panel and studs, but the inside still needs fixing as you can see. We only use it for storing garden tools and such, and plan to install a workbench for crafting, with no current plans to heat it. (We have other spaces for frost-free storage). But I figure it’s just as well to insulate it if I’m going to put up wall panels, so it’s done if we change our minds later.
So the question is how do I solve this as simply as possible? Is it okay to just put insulation between the studs directly against the membrane, and then screw plywood panels right onto that? Or do I need to create an air gap between the outer panel and insulation, and also add diffusion plastic between the insulation and plywood as stated in this article? https://mobil.byggahus.se/renovera/sa-isolerar-du-friggeboden-garaget
It depends on whether you want it heated or not. If you plan to keep it below 10 degrees in the winter, you don't need any plastic. If it needs to be warm, you must insulate and seal it like a "real" wall.
Alright, thanks - I'll skip the plastic. And creating an air gap between the insulation and the outer panel+wind barrier seems a bit overkill to me as well, or should I really build an air gap with battens there?
Another thought - I'm not going to do anything about the roof now, but the idea with insulating the walls now is that the whole area might be insulated in the future. How high should I place the boards now to facilitate a possible continuation with the roof in the future? Is it enough to bring them to the middle of the top horizontal beam, so there's room to attach something more to it? Or should I insulate and place boards all the way up to the outer roof?
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