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I think that type of building is "concrete sectional" if you need a key word. Has it been tested to establish it is asbestos and not regular fibre cement roofing?
It strikes me you have 3 options: 1) full Monty, 2) replace your panels and the neighbor(s) that share them, 3) spot repair.
My 2p is that it's worth the effort of identifying the other owners and trying to replace the whole roof. It strikes me as exactly the sort of thing where from 2yrs down the line until eternity you'll regularly bore your wife and kids about how; "I should have done it properly when we first moved in".
I may be naive but from a builders POV this strikes me as a lovely job. Reasonable size. Low effort. Easy access, not that visible/high ATD not required, rip off the old roof, chuck a new cement or corrugated iron one on.
Maybe you could get fancy with new joists and a fiberglass roof. But even that's quick and easy.[edit: the Internet says this is a bad idea]In my school those asbestos panels were in sections like regular corrugated iron, so it might just be garage 2 or 2 & 3 with the same sheet. But idk if there are issues with matching to new fibre cement panels. Worth exploring, but not certain.
If you have no luck there are roof sealing products - basically sticky gunk with fibers. You paint it on and it cures. So read the instructions, but probably cleaning followed by painting the whole area would make it water tight again. You could spot treat the holes underneath I guess, which would also bind any straggling fibers.
Ask @Dammit for his thoughts as he had a similar space.
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hugo7
without doxxing myself (and i will remove photos in a few weeks), my new home has a garage. While this is great news in itself, it isn't flawless:
Therefore, I want to get some people in to replace the roof and then get electricity wired over from my house (it is only next door - not impossible). Question is, given it is sheets of asbestos across the neighbouring garages, is it actually possible for someone to replace only my section of roof? I have no idea who owns the other 5 or 6 garages, so managing to orchestrate a mass re-roofing will be a nightmare.... photos of said garage below - welcome any input whatsoever