Flat warm roof fixing insulation and top board

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25 Aug 2016
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Hi,

I'm building a flat warm roof, got the timbers and firrings on with 11mm osb glued and screwed on top, next will be a layer of vapour barrier followed by 120mm insulation, 18mm osb then the membrane.

What do I use for securing the insulation and 18mm osb to the roof? Do I get some type of 150mm screw and screw down through the osb, insulation and vapour barrier into the 11mm osb?

Thanks
Chris
 
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