Any roof sheathing that could not tolerate at least as much relative humidity in the attic as exists outside of a ventilated attic space seems inappropriate for use. Plywoods solve cost, structural and conveniece issues but perhaps that is where benefits stop. Gapping requirements beg the...
Need a plywood expert that isn't tied to the plywood manufacturers to give rational advice and tips on plywood roof sheathing and its pitfalls, if any.
Thanks JAE .. however, the more I hear about ventilation of attics, the more suspicious I am becoming ... what relative humidity can sheathing plywood tolerate? Seems that the plywood industry is hanging their hat on vague science. When selling the product, they say it can be immersed in water...
Need engineer/expert to analyse the edge delamination / bulging of SYP roof sheathing that causes unsightly telegraphing of plywood joints through roofing material. Any help out there?
