I have a cut roof of about 35 degrees with a another the same at right angles. I want to fit a GRP valley. Can anyone please advise the width of valley I should fit. Thanks
no valley boards required for grp valley.just run a strip of felt down the valley,wider than the grp.lay grp up valley and run tile battens either side of grp.you must run battens either side of grp to support it...
I have a cut roof of about 35 degrees with a another the same at right angles. I want to fit a GRP valley. Can anyone please advise the width of valley I should fit. Thanks
make the boards wide enough so that they protrude past the edge of the grp by say 3". this then provides a 'catcher' to which some of the tile batten ends can be fixed.
otherwise some lathes will be 'floating' and this can be a nuisance if there is a knot in the lathe and you end up putting your foot through the felt/membrane.
the valley boards should sit between the rafters and flush with the rafter top.
At the top of the valley you would normally dress in a lead saddle,which is a piece of say code 4 lead 18" x 12" dressed over the valley/valleys
then bed your ridge on top.
Hope this helps
Dave
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