Garage to (very small) workshop - insulation?

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Hi everyone

I’m not at all new to DIY but quite new to a lot of stuff I’d like to do to my garage to make it useable for a few hours a day in winter and generally just a more pleasant place to spend time. Kind of want to make it a nice clean space. I know there are loads (AND LOADS) of similar threads but hope you don’t mind me asking for some specific advice as I’ve kind of over-researched and am now lost in a sea of contradictions! Questions about insulation and gap filling. Photos attached for context. Don’t know what the word is but it’s like a pent roof shape like half a gable so one side high the other low



Here’s the context:
- Unfortunately the previous owners split the single car garage so I only have approx 2.6 x 2.7m to play with. The back wall backs onto the utility room which is what used to be the other half of the garage.
- would be used for woodworking and electronics repair projects

- For heat source I’m fine to use a 2kw portable heater but open to other ideas. The utility room is the hottest room of the house in winter (overly hot really). Is it worth looking into some kind of heat exchange solution?

- Insulation, I really don’t want to put anything on the walls as there is already so little space. But I think I would still get some benefit from filling gaps, insulating the door, roof and maybe floor?

- the floor I have ordered those GFTC PVC tiles. Is it worth putting a thin layer of eg carpet underlay beneath? Unfortunately I don’t have much height to play with either, but wondered if the thin underlay might make any different or just pointless.

- garage door… I know you can get kits, but also assume I could use the thin foil stuff or some PIR?

ROOF is my main area where I have questions. How do I tell if I have a breathable or non breathable membrane? If I was to use PIR boards should I attach them to the lower joists or somehow onto tje upper ones (beating in mind the headroom issue)?

Do I need to plasterboard and/or use a membrane? The garage is painted white for lighting so assume plaster boarding will be useful. I got some free tapered edge plasterboard off freecycle but from my research it seems that’s not really ideal. Can anyone confirm? What do I need to do for ventilation ? Can’t see any air bricks, vents etc up there.

I am looking for the easiest solution for (mostly) one person to be able to fit - don’t mind paying a little bit more for ease?

Also there are some gaps that need to be filled eg around some meter boxes. Assume I’m ok to just foam fill or seal around those?

Thanks for any and all help, don’t know anyone else good at this stuff so any advice at all I’m thankful for!
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I appreciate its small but you're not going to feel an appreciable loss of space by glueing 50mm insulation backed plasterboards (or make your own) to the walls, floor and doing 50mm between ceiling joists, 50mm under. Done in PIR you're not going to need

As for heat exchange from the utility, depends how it generates and how moisture laden it is if it's coming from eg a vented tumbler. By all means run the exhaust pipe through the garage but don't vent it into
Perhaps consider an all in one wall mounted air to air heat pump; it can cool in summer and heat in winter and is around 5x efficiency of a fan heater
 

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