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Hi Woody, would I be correct in saying this is a wet gully as it has sanded strips along the edges? Also should there be valley boards and or ,at least a strip of felt beneath the grp valley? Thanks, Mark

I presume you mean by that it's all wrong or is there anything specific I should quote? Thanks, Mark

Good afternoon all. I am having a kitchen extension in my bungalow and am concerned that the GRP gullies have not been fitted properly by the roofer. They have sanded strips up both sides but have been told by the builder that they don’t mortar them in anymore. Further, there are no...