Sloping flat roof

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I want to build a flat roof 8m x 5m.

I want the fall to be on the 8m section and because of the span can’t run the rafters in that direction. If I run the rafters in the Direction of the 5 meter rafters how do I get the fall on the roof to run against the rafters I’m planning a flat roof warm construction OSB PIR OSB EDPM.

Hope that’s clear.
 
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At the risk of answering my own question I’ve found information taht says I can run the furring strips at 90’ to the rafters but over 8m might be a stretch? Anyone seen 8m furring strips that arn’t stupid money?

It there an alternative?
 
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You just need two sets of the 4m firrings, it's just that half of them will be sat on some consistently thick battens.
 
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