Is this roof GRP valley as good as it gets?

[swissheavy]

Ive had Professionals come in to fit a GRP valley, replacing an old and slightly leak lead valley. Fairly good job, Bar two tiles which aren’t seated properly. Image attached.

The reason for this is because the ribs on the valley raise the tiles up slightly. The roofer is saying this is the best that can be done. What do you think? How would you fix it?

 

[Doggit]

You should be able to lift the 2nd row tiles, and take the bottom ones out, then see if you can trim or readjust the grp to allow the tiles to sit properly. It's not a great job, and I think he could have done better to be honest, as those tiles were obviously laying flat to start with. Obviously, doing it in GRP was cheaper than lead, but GRP doesn't have the life that lead has.

 

[catlad]

You can lift those tiles out, prise the baton off the
valley rafter a bit and insert a piece of lead under
the baton.
You can sometimes pack individual tiles but it can
have a knock on effect.
I think he could have tried harder.

 

[noseall]

We never take the GRP valley down to the gutter because the fascia kick can cause trouble. Rather, we cut the valley short of the fascia and then use a 450mm x 450mm lead soaker to shape the remaining valley into the gutter.

The valley should also be sitting flush with the rafter tops and should be sitting on plywood trays fixed between the rafters. This means the roof tiles feel the full benefit of the tile batten depth whilst the GRP valley sits as low as possible.

Untitled

• noseall
• 6 Jun 2015
• 1

 

[swissheavy]

Thank you for the super informative posts guys. Particularly about the valley support.

I have called them back today saying I’m not happy and won’t be paying until the job is properly done. Was made to feel I was asking for perfection and maybe that’s the case as I’m paying a 20% premium compared to other quotes I had!!!

 

[datarebal]

lead saddle at the bottom , or notch out top of fascia and block off the central upstand..

 

[noseall]

lead saddle at the bottom , or notch out top of fascia

We have found in the past that this can cause gutter fall problems as the valley can clash with the gutter at a point where the gutter needs to be at its highest. We stopped notching the fascia for this very reason.

 

[datarebal]

yep it can happen, that is why i gave both options