DumbFounded
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A few years back we had a single storey extension built with a pitched roof at 90 degrees to existing - therefore valleys down each side.
The valleys are some sort of plastic. Each side of the valley has a couple of inches of cement mix packed in above the plastic and below the tiles.
One of these valleys is still largely ok, but for the other one the cement keeps sliding out of place, blocking the valley, such that in a downpour the rain is dammed, pours over the side of the valley and leaks through our kitchen ceiling.
We have had the cement work replaced twice already and are looking for a "third time lucky". How can we bond the cement to the the plastic to keep it in place? Surely this must affect anyone using plastic valleys?
Friend suggested either inserting screws into batten behind cement (assuming there is one!) or stapling rolled chickenwire to same, to give something for the cement to grip to. However, the overhang of tiles over valley makes it too narrow to get any tools in.
His second suggestion was paint bitumen onto edges of valley and push a bit of grit into it, giving something for cement to sit on that would keep it from sliding.
His third suggestion was maybe get some kind of plastic conduit with self adhesive backing and press that onto the sides of the plastic valley, then pack cement in.
What should I do really?!!!
Thanks,
Dumb
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