GRP gully leaning in the wrong direction

[opps]

Hi all.

A customer has a parapet wall with a 1000mm long GRP gully which should run down to a hopper. At the non hopper end is an old chimney. Unfortunately, the gully tilts in the wrong direction and the water pools at the chimney end. He says that he has a leak indoors at that point. This morning, at the deepest point, the water was about 8mm deep.

Any suggestions on how to rectify it without too much disruption. I am not a roofer and so don't want to have to lift the tiles to remove/replace the gully. Is there a super thick resin that can be used, or perhaps, could I cut some uPVC, pack it out and then either GRP over it or just seal it with CT1?



The above is taken from the chimney breast. Not visibible is the (lead) exit to the hopper. (Photo taken today and not yesterday).



The above is from the hopper end, running up to the chimney breast. Today, there was only about 3mm of water, but it hasn't rained for a while and evidently, 5mm of water had evaporated off. (Photo taken today and not yesterday).

Thanks in advance.

 

[ree]

OP,
Why have you involved yourself in doing a job like that when you obviously have no idea of how to go about that kind of work?
eg. if water was pooling & slowly draining then there's more to it than a wrong falls.

None of your suggestions will work, they will only cost the "customer" money, & future leaks so why not leave it alone & call in a roofer who is competent doing simple lead work?
Do you understand the insurance consequences for working at height?