Workshop roof, metal & wood truss, sheets or tiles?

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AAaaaaahh.

Can anyone give me a definitive answer on ventilating the Decra product.

Breathable membrane (possibly with a breathable board under this) Insulation between the rafters and lined with ply or OSB as a VCL. Happy to stick a VCL plastic in but don't think it needs it. Will be sticking a little heat into the workshop but it will be occasional.

Problem is that there are a couple of ridge vent options as well as over the eaves type available, Do I need both either or none?

Have spoken to Decra technical but the lady was friendly but not very helpful.
 
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