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Re: Roof Construction Advice

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The 2x T&G is your diaphragm the upper plywood is to cover insulation and attach the roofing material. The 2x4 below plywood is backing for nailing.  What is the screw type and embedment required in purlins? 
 What is the wind uplift loads on roof ?  The screws should resist this uplift load so you don't loose the plywood in a storm.  Purlins need to resist uplift load also.
Joe Venuti
Johnson & Nielsen Associates
Palm Springs, CA