Repair to broken fibreglass trim (pics included)

Evening!

Back in 2017 we had a loft conversion with dormer fitted. After a bit the roof started leaking and it turned out to be that they had not terminated the dormer roof properly with the existing pitched roof. There were a few other bodges by the original builders but these were sorted out (so I thought) when the roofer replaced the front pitch and did some work on the dormer fibreglass roof.

However, ever since the dormer was installed, on windy nights there has been a lot of banging coming from the roof. I'd been up there a number of times but couldn't see anything obvious. Anyway, the last visit on to the roof produced this:





So finally I have identified that it has been trim rattle, caused by the trim not being properly fixed down (it doesn't look like it is wide enough to fit it's location). Three months later I've got round to actually getting some quotes and was surprised one roofer suggested removing all the existing trim and torching mineral felt over the top. I'd assumed that it would be best putting fibreglass back over the top (this is what the other roofer quoted for).

In reality i'm happy either way as long as its sealed and stops banging every windy winter night. I'm not bothered if it doesn't match as it can't be seen anywhere from the house or garden but I am bothered that it is done right!

Can anyone advise please if both these options are good and if so which they would favour? At the moment the like for like replacement from the second quote is 50% higher than the torch on option but i'm happy to pay the extra IF the opinion is that hands down this is the best option.

Thanks for any advice!

Thats a very odd way of finishing a roof-massive bodge is probably a better description.
The 'roofer' who suggested junking the trims and torching felt to the grp roof and pvc fascia board needs reporting to Trading Standards. Bitumen doesn't bond to fibreglass & pvc melts.
That drip edge trim isn't ideal for that situation and has been installed tight (the face should be vertical), ideally with that trim you'd have fixed a batten to the fascia & glued the trim to the batten to give it some strength and stop it flapping in the breeze.
The quote you're looking for should include;
Cut out and remove existing trim
Grind topcoat back by 100mm
Fix batten to fascia board
Fix new trim to fascia board and deck (clout nails and PU to deck, PU to fascia batten, clout nails as well if exposed location)
Bandage and laminate trim to roof deck, bandage and laminate trim face if clout nails were used to fix to batten
Relaminate from roof deck to trim
Topcoat new laminate and trim

Thanks for the response. The quote to use fibreglass replacement from roofer 1:

To remove damaged drip to right hand side of dorma roof.
To supply and fix new drip to area above.
To supply and fix fibre glass matting to all joints on above area.
To supply and fix rapid roof curing system to above area.
To supply and fix rapid roof top coat to above area.

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Roofer 2:

1) Removing all old Fiberglass drip edges around area of needed attention.
2) To install new drip edges using a torch on application mineral felt substrate.
3) Ensuring all mess and debris will be removed from site.
All work will come with a 10 year guarantee.

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So we’re suggesting roofer 1 is the right option.

Roofer 1 is proposing the correct method. If the quote is substantial (more than £200 or so) i'd suggest getting some more prices.
How is access to the area- if scaff is needed that'll push the price up (check the quotes to make sure the roofers have priced in access if required, some sharp operators will give a good price for the job but small print will hand you responsibility for safe access)

oldbutnotdead said:

Roofer 1 is proposing the correct method. If the quote is substantial (more than £200 or so) i'd suggest getting some more prices.
How is access to the area- if scaff is needed that'll push the price up (check the quotes to make sure the roofers have priced in access if required, some sharp operators will give a good price for the job but small print will hand you responsibility for safe access)

Click to expand...

£200 would be nice - the quote from roofer 1 is 3 x that, though i'm sure London will push it up a little.

I have had a quote from a third roofer who has also suggested the torch on felt option. I'm surprised there is a reluctance to work with repairing the fibre glass.

GRP takes longer than felt and the trims required for a neat job push the price up as well.
GRP also needs a solid deck or it'll look rubbish and fail quickly, torch felt you can chuck onto any old ratty boards or masonry & it'll look ok & last long enough ( 5 years plus).
By the way, grp won't bond to that pvc fascia & nor will torch felt

EDIT Does the. £600 include access (scaff or cherrypicker)?