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my friends house built in 1985, had a sick roof. not a single vent. lots of mold. this summer he had a complete tear-off, plywood too. I sugested soffit vents and a ridge vent, the roofer agreed. 100 sheets of plywood, and $11,000 later everyone is happy. the roofer appeared to do a nice job. My friend had been waiting for me (8 months) to help him vent his bathroom fans, instead of dumping moisture into the attic. I finally get there, and I'm in the attic, it's dark but I'm noticing the plywood is the prettiest looking sheathing I've ever seen. It is sanded smooth and has no stamps or labels. I found a small cut-out from around the stack pipe and brought it into the light, and it is 1/2" luan.
How bad is this?
Luan is not rated for spacing, I think it has interior glue so it should'nt get wet, but if the roof holds up it won't get wet.
around here the cost of cdx and OSB has nearly tripled in the last 2 years, while luan has remained the same. so it must have been a cost issue.
how bad is this? and should I even tell my friend?