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Yep. All good sense. Before I board from the outside il insulate and add a damp proof membrane.
I will also do the same under what ever flooring solution I end up using. The problem there is that the cost of PIR board + t&g is astronomical! Mrs Clement is rapidly losing sense of humor about the spend.
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Yeh it’s not cheap, and you’ve got a big area to do… annoyingly, it ideally wants doing before you do anything else, unless everything you install is relatively easily removable at a later date when you can justify the cosy.
Alternatively just deal with the concrete or get some of those plastic interlocking tiles that are designed for garages.
(Edit- reinstating my original “justify the cosy” typo after editing it out)
(Edit- did not look at time stamp when I wrote this reply, probably moot now!)
Not at all.
I’d you don’t need the big door there’s no reason not to. Just make sure you put some kind of membrane/dpm between the door and whatever you build as you don’t want condensation (which you may well get on the back of the door in winter, especially once you cover it and remove any ventilation) on the back of your stud wall. Plus it’s just a stud wall, if you decide you want the roller door back you can take it down.
The one thing I came here to say was insulate it! But sounds like you’re doing that. Obviously walls/ceiling is most important but you could do a floating floor very easily. Even 25mm PIR board with T&G floorboards on would make a hell of a difference.