How are you cladding the polyiso? I'd say you could use two layers where you screw in the inner layer(the screws would need to be inset/flush) and then overlap the seams for the second layer, using the construction adhesive to stick the second layer on. The trouble with this is installing your siding that will protect your precious and fragile foam because I don't know of any protective cladding that can be glued on to polyiso to protect it from the neighbors golf balls, hail, insects, and animals.
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