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Spoke to BCO today and he is happy with a double layer of 6mm WBP with staggered joints followed by 2 layers of tyvek with staggered joints then counter baton, baton, cambrian slate. Will also seal the joints between the ply before the tyvek (any advice what to use? Was thinking window sealer...

The ridge is a fixed height so the only way to increase the pitch would be to drop the rafters at the opposite end therefore decreasing head height inside. Thanks for all the advice and the speedy replies. It seems the consensus is to treat as a flat roof and fix slates as decorative...

Yes. The roof is almost a flat roof (I think technically anything below 10 degrees is classed as a flat roof).

I am currently building an extension and am almost up to roof level. The roof will be around 10 degrees but one of the conditions of the planning approval is that it must be a slate roof. Cambrian slates will only go down to 15 degrees. I was wondering, is there any way to seal the slates...