Concrete tiling into a single ply flat roof/valley
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Concrete tiling into a single ply flat roof/valley

by dnelson » Thu Sep 23, 2021 12:52 pm


Can anyone see any issues that I would have with the below roof design ?

The roof has 2 pitches - a standard 6 degree flat roof (single ply/PVC) but the 26 degree pitched gable element will have double romans. The single ply continues up the 26 pitch to ensure weathertightness and the double romans are on a cross battened frame over it down to the valley.

I don't want to elements to get under the tiles so I plan to rest the leading edge of the tiles (in the valley) on a continual standing seam, have eaves combs up at the first baton and then sloped final standing seam sections further up under the cross baton as a last defense

I am hoping this will be enough to protect the roof but wanted to check if there is anything I have overlooked

mixed roof.png

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Re: Concrete tiling into a single ply flat roof/valley

by stoneyboy » Fri Sep 24, 2021 10:35 pm

Hi dnelson
Possibly the weak element in your installation is the use of only a single layer of felt in the valley at the bottom of the tiles. It’s probably too late to reinforce this area.
Regards S

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