27 Aug '11, 6pm

fastening rigid insulation shear value/ site built SIP's #green

I am adding 4" of rigid insulation over my existing cathedral ceiling. The existing structure is a simple gable roof build with 2 x 6 rafters 16" o.c. with R-19 batt insulation. Each side is 15' x 52'. The plan is to install the rigid insulation over the existing sheating and add an additional layer of plywood and roof with a 22guage standing seam roof. I will capture the insulation at the perimeter with a taller fascia but several of my construction knowledgeable friends are questioning the lack of shear in the field by screwing down the new sheating with long screws thru the soft 'rigid' polyiso foam into the existing sheating. Notes; 1. Located in southern california 2. Existing sheating was removed and existing framing was improved by adding plywood edge blocking, framing clips to rafters and blocking @ wall plates and ridge beam. The concept of installing solid lumber...

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