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Thanks, I'll take a look at this option. The architect has washed his hands of most of the tricky details, he's useless after he was paid the ridiculous sum for the job.

Have swift box elsewhere. This is a detail which is going to happen, I'm just looking for advice on a sheet product which might be useful. Thanks!

It's the choice of board - was just trying to find a more cost-effective option which isn't the Meteon board! The cutting of the star - the builder seems confident but any tips would be more than welcome. Thanks!

Hello! We have a detail on our roof edges in the V of the barge boards, which is a flat panel with a star cut out detail. As seems usual, it's one of those things the architect just said 'builders will figure it out on site' when asked his opinion on how to complete this. It has to be one solid sheet with as little future upkeep as possible. Builder has suggested a sheet of Trespa Meteon which we can cut the detail out of. Seems a good plan, is a little steep on costs and delivery of one sheet! Would anyone have an idea of how else this might be done? FYI The base of the triangle the star is in is approx 1.5m and the height approx 0.8m. Thanks in advance!

Just in case anyone look at this in the future for a 'case closed'! The GRP guy gave up immediately and has invoiced for the correct quoted figure. So thanks for all the advice to back me up! Much appreciated to all.

It's definitely a solid quote. I'd post it but at 58 pages long it's really just ridiculous. It's absolutely a quote though and clearly itemises all things included, there was nothing new on site added to the job.

There was nothing new at all, but the work just took longer than he thought it would. He said 4 days and it took over 10 days in total. However, nothing changed about the spec at all, it's crystal clear what we wanted included and that is entirely included on his quote. I agree he is chancing it; spoke to our project manager today and he has decided he agrees we should not pay more. The guy's own crew warned us he would try to get extra. So I think it's something he just tries! I would post pix but would not want the company concerned to see it's obviously me. I never know who might be lurking but probably being paranoid.

I am a domestic client, it's my self build and I asked him to quote for the job. He mentioned on site close to install time that the warm roofs were not included, I said they were, went home and double checked the quote, and warm roof work is mentioned 3x on his own quote. Certainly no extra was agreed at any time until now he is asking for £3,000. His company is nationwide apparently, and no one local knows him. Our project manager/builder says we could consider paying but are under no requirement to. I was surprised the builder said this so hence coming here for info; I thought a quote was a quote and final as no extra work has been done. He just said it was more work than he thought.

Oh I don't know why I cannot seem to reply to actual comments. SteamyTea said: "The sad thing is it an easy, but messy, fix. I suspect that they did not put enough resin into the first layer of mat. I hope they put a second one on, but may have not. Water will get in, will be absorbed by the unsaturated mat, freezing will happen, then it is just a matter of time before it fails." Oh wow, this is not great obviously. There is one layer of mat only. What is the fix? The company have already once sanded back the top coat, and redone that top coat. I have a 'lifetime guarantee' against it failing. What should they be doing to fix it please and where can I find the info - because they insist it's not a problem, and I cannot find anything online about pinholes in the top coat. Help! Please.

Thank you, Joe90. Hard to get another opinion - seems no one knows GRP, even our project manager or site manager say they are no experts. I might ask the tilers if they have ever done GRP, they seem an excellent crew. Thanks again, will hold firm and see how it goes.

Hello - I've had a GRP company in to do 2x flat roofs and 2x other areas on a self build. Quote was approx £11,000 for full job including warm roof/timber work etc. Company is now asking for £3,000 more as the job was trickier/took longer than they thought. We put up with delays from them, not turning up etc and just powered through to get it done. Final colour coat still has pinholes in one area (done twice now) but we have been told to live with it as won't affect performance. Ugh. We understand a quote is a final agreement and this is ridiculous to expect more. But others have said we could consider paying them. Any opinions out there? Thanks!

Thanks! Measured and they're 85/80mm supported so will have to see what the TF guy says about it!

Thanks very much for the advice, I'll get back onsite taking more photos and speak to the timber frame engineer. Much appreciated.

Thanks, George. The engineer is not coming to look at it, he's instructing from afar as he's the timber framer engineer. I'm suspecting it truly need him onsite to get a proper inspection done. We actually believe the house is 80mm bigger than it should be front to back, and this accounts for the 40mm discrepancy at either end of the steels. It's a bigger problem - but the steels' bearing is one aspect I need to add to my arsenal of info!

Hello! Our timber frame is going up and is at roof stage. There are 2x steels in the ceiling of the first floor, these both rest on external 140mm walls for support. Those steels are bases for steel triangles which are in the attic/roof space. The 2 main horizontal steels, on the timber framer plans, their ends rest fully on the walls so 140mm end of a steel is on the wall. This is at either end, and the rimboard on the plans is removed in those areas. However, in reality, on site the ends of those steels only rest on the walls at approx 95-100mm and look short. The rimboard is still in place there. The site manager says 100mm is the minimum they must rest on the support wall, so it's fine. Can anyone direct me to the actual building regs which state this? I've searched online and cannot find anything to support the 100mm. (No pun intended!) Thanks in advance.