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I doubt you'll get anything worth anything from anyone going down the "official" route, other than some smiling and nodding.
If the job is signed off by the neighbour's building control officer then that's good enough for an insurance company/surveyor.
Are they a reputable company? Do they want to squander their rep by doing a shit job on something that is easy to do correctly?
I'd suggest talking to them openly and directly and asking them how they've weathered the roof, and express your worries to them. -
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I'd leave it if i were you.
You're losing nothing here other than potentially any friendship between you and your neighbour.
If you build a dormer in the future you can join onto theirs directly and both of you will enjoy the benefit of that.
Provided their work is done to a high standard (the step flashing suggests that their lead man is at least competent) you have lost nothing, and they have taken nothing from you. You will gain nothing from pursuing it.
Any gap between is a stupid way to construct a dormer.
(edit: the drawings show the neighbour building up to the centre line of the party wall, which is generally assumed to be the centre line of the chimney stack; the 300mm is the distance between your edge of the stack and the centre line of the stack, they appear to have built as per the drawings)
I would consider very seriously if this is a road you want to go down. -
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Yep, a crisp cut off a track saw is step one.
Sanding the edges up to some fine grits without rounding them is step two.
When i used to prep mrmdf for the spray shop we used to get the edges to look almost polished, and even then the paint would show up a saw mark every now and then.
I didn't have the patience for it. -
Like any type of MDF with any type of finish on it, it's only as good as the person cutting it and finishing it.
Any fucker can lash something up out of MDF, but to make it presentable you need someone who knows what they're doing. Obviously I'm mostly talking about the edges.
Assume you've got that covered, otherwise it'll look shit no matter how you finish it. -
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Also...
with doing things to your house that require planning - you can (theoretically) do what the fuck you like.Until someone complains.
Then you (sometimes) have to undo it all.Sometimes the complainant can be an eagle-eyed planning officer, but more often than not a grumpy neighbour who wasn't allowed to do what you did do, or simply a jealous curtain-twitcher.
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Well that joist is helping to hold your suspended floor up; notching it for a pipe is usually fine, but it's not a big timber...
Obvs a plumber would just not worry about it, as the structure of the building is not as important as their pipes.
I'd just dig out a little of that shit under the joist and send the copper underneath and up into the gap. But presumably you're getting a deeper rad so the pipe centre is directly over it?