correct way to fit grp valleys

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I've got grp valleys to fit. The boards are fitted as detailed in earlier post and all felt is fitted. What I can't work out is whether to nail the battens so they push the valley to follow the contour of the boards, ie: form more of an actual valley, or so the valley sits without any stress as it comes, a flatter profile in which case it isn't supported fully by the boards. I hope this makes sense. Can someone put me right please?
 
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GRP should sit on a firm base.

If you don't push it back towards the valley boards, then you will have a void beneath it, and be more liable to fracture
 
you must run a tile batten up either side 0f the grp
then nail through edge of grp and batten in to each spar
do not flatten the grp on the ribbs
a lot of lads have done this at work and the valley has pi$$ed in
 
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Thanks for that. The manufacturers advice is a bit vague.
 

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