GRP To Felt Joint

[taggs101]

Does this look the correct way to join grp to felt ? my roofer seems to think so, i'm not so sure.

Any advice would be most welcome.

Cheers

[SteamyTea]

It is relatively easy to put felt onto GRP, never tried the other way around as I know it would cause problems. Have they poured lots of bitumen onto the joint?

[taggs101]

not tons, but I really don't like the way the fibre glass is attached to the felt, supposedly it will give way over time, plus if the felt moves it will crack the joint.

[Mr Punter]

The upstand is fair enough.  Neither GRP or felt look very good.  As per @SteamyTea I would have thought felt on top of the GRP.  I assume you re the GRP and your neighbour is the felt?

[taggs101]

1 hour ago, Mr Punter said:

The upstand is fair enough.  Neither GRP or felt look very good.  As per @SteamyTea I would have thought felt on top of the GRP.  I assume you re the GRP and your neighbour is the felt?

ye I'm the grp, the roofer reckons fibre onto felt is fine and he's not for trying to do something different, not paid yet so its becoming a bit of a stand off. 

[SteamyTea]

36 minutes ago, taggs101 said:

not paid yet so its becoming a bit of a stand off.

Run a hose on it for an hour or two.  Though I expect it will fail after the summer, differential expansion, felt, being a type of 'wax' will also act as a release agent.

Edited June 28, 2021 by SteamyTea

[PeterW]

Felt looks knackered anyway - take it the neighbour wasn’t interested in having theirs done too..?

[taggs101]

1 hour ago, PeterW said:

Felt looks knackered anyway - take it the neighbour wasn’t interested in having theirs done too..?

tried to convince her a few times but she recon's her side is fine !