what size grp valley?

[calvert]

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

 

[east coast]

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...

 

[noseall]

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

i recommend using valley boards for a grp valley.

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.

 

[calvert]

Thanks for your answers. Are the actual valleys all the same width or does it vary with roof angles please?

 

[datarebal]

roof pitch makes no difference, The GRP only varies make to make

 

[calvert]

Thanks. How is the valley sealed at the top? Is it just by the ridge tile being cemented upto the tiles on the main roof?

 

[Leadman]

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

 

[calvert]

Thanks Leadman. Perhaps I'll get a professional in for that bit!

 

[datarebal]

If you can drop in the grp then you could easily be able to fit a saddle... easy!!!

 

[calvert]

Oh. Is there a website anywhere showing one? I've trawled the web but can't find anything.