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Roof Construction Advice

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Dear Fellow Engineers:
I?d appreciate advice re roof construction in a high
wind area. My client has seen a drawing (& wants me to
use) an arrangement where the roof plywood diaphragm
is nailed to 2?x4?s on flat, that bear on 6 inch thick
extruded polystyrene (used for insulation), which is
supported by T&G decking on purlins. The 2?x4?s are
screwed thru the poly to the purlins. I?ve no
experience with polystyrene ? but can imagine that
nailing the plywood panel to be very difficult because
of poly?s initial deformation. Is this true? And are
there other issues with this construction arrangement?

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