Any thoughts on this - neighbours having some work done

[princeperch]

I get on very well with my next door neighbours. I had a box kitchen diner done in 2022 and they are having a similar (but much more extravagant) extension done with a pitched glazed roof. They sent me the plans etc and I don't have a problem with it and signed the part wall letter.

Part of their old extension had a coping stone detail to it and my fibreglass roof was sealed with a grp trim all the way along the party wall side. As far as I am aware it has not leaked.

They have removed their old structure recently which also involved removing all the coping stones and the wall underneath it. They didn't have a choice and I accept they had to do so.

In doing so however part of my fibreglass roof is now exposed and is delaminated from the decking. I am not concerned about my neighbours willingness to resolve this, they are great neighbours and can afford to do so.

I understand however that they have a fixed price contract with the builder so anything like this will come out of his pocket.

I am a little concerned with what I can see in the photos. The entire trim will have to o be replaced from what I can see and when they have rebuilt the wall and have a coping stone detail reinstated I assume that they will need to chase the trim into the brickwork. It does seem that the fibreglass roof has now come away from the osb board and I am assuming that this cannot now be tacked down and will need to be replaced.

All in all I am a little worried about the builder fobbing me off with this but at the same time I do not want to go in all guns blazing and cause an argument (at the moment).

Is this a watching brief do you think or should I be trying to formalise what they are going to do, via their architect, now ? If the fibreglass has delaminated will they need to cut it all the way back until they find it is solid ?

Cheers for any thoughts.

[princeperch]

Here is what it looked like before



Here is what it looks like now

[JoshSm]

I'd assume you can probably rebond it if there's access from the edge.

You likely want to stabilise it anyway until it's all reinstated?

[Red9zero]

Ideally the GRP would need cutting back to where it is properly bonded to prevent any problems further down the line. I'd be getting a proper GRP flat roofer in to have a proper look before the builder is tempted to bodge anything. Also, depending on where it has delaminated, I'd be a bit wary of any wind getting under it and making it worse.