I’m looking at a set of plan for retrofitting a cape cod, architect has called for 12″ of EPS foam to be added on top of the existing deck with zip sheeting on top to tie into the walls (also getting EPS and ZIP) they are calling for us to drive “14” construction screws at 16″ center into the existing rafter” anyone seen a system like this employed??
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Prescriptive codes don't address the connection at less common angles, so base the connection off more typical ones using bolts, structural screws, blocking, and steel tension ties.
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You can get 14" screws. I've never seen this done. They are going to be expensive and you are probably going to miss the rafters with about 3/4 of them. There has got to be a better way.
I'm all ears, I've been dreading these plans coming out again, its for an existing client i really want to keep happy so I want to make sure we get a system I can install and aligns with my customer's efficiency and aesthetic goals
I would think the key would be to use some kind of jig to start the screw thread square, then it would be easier to finish the job.
Stand-up drill designed for the job, with provisions to keep square, would be ideal.
The longer screws will need to be a larger diameter than required for just sheathing, just to stay straight.