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- 18 Apr 2020
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Can anyone recommend how to build up a lead valley on a warm roof? The roof is to be slated with 20" x 10" spanish slate. Tile battens are to be 25 x 50mm
Photo of my roof attached. (eaves trays were momentarily off when the photo was taken.)
options seem to be:
Fit the valley boards flush with the top of the counter battens (reducing the flow of any water on the membrane) then build a proper valley with tilting fillet and welt. Leave the membrane passing beneath.
Or carefully rip up the valleys and detach the membrane from the insulation and end this in the valley... (seems like a lot of remedial work!)
Or put the valley boards on top of the counter battens. like in the photo. The issue here is getting the valley boards strong enough yet thin enough to allow the fillets and lead welt within the 25mm thickness.. I'm not sure it's possible.
or some sort of hybrid solution featuring battens for strength between the counter battens then maybe a ply to flatten it?
Any help greatly appreciated.
Dan
Photo of my roof attached. (eaves trays were momentarily off when the photo was taken.)
options seem to be:
Fit the valley boards flush with the top of the counter battens (reducing the flow of any water on the membrane) then build a proper valley with tilting fillet and welt. Leave the membrane passing beneath.
Or carefully rip up the valleys and detach the membrane from the insulation and end this in the valley... (seems like a lot of remedial work!)
Or put the valley boards on top of the counter battens. like in the photo. The issue here is getting the valley boards strong enough yet thin enough to allow the fillets and lead welt within the 25mm thickness.. I'm not sure it's possible.
or some sort of hybrid solution featuring battens for strength between the counter battens then maybe a ply to flatten it?
Any help greatly appreciated.
Dan