Haven’t done a lot of metal roofs and so hoped someone could answer a couple questions for me.
Did an inspection today on a house built in 2006 that had a metal roof. While in the attic, I noticed that there was no plywood or OSB sheathing/decking between the rafters and the metal sheets. Is this allowable/correct? All the metal roofs I have seen have had some sort of decking, but then again, most of those roofs were installed over an already existing roof.
Also, there was a vent pipe that didn’t go through the roof. I assume that is incorrect for a metal roof as it is for a shingle roof.
Is that a typical metal roof installation for a new roof, i.e., with no decking/sheathing? If so, is it done that way because it is cheaper and/or faster? Just curious…
In your photo there appears to be a lot of eave daylight. That usually is an indication that the profile vent/stop material was not installed, is displaced or has failed.
Vermin, insects and birds can become problematic when this feature is omitted. This is not necessarily a defect, more of a nuisance issue and advising the client along with a note in the report…avoids call-backs :roll:
I see a lot of metal roofs and have never seen one installed without roof sheathing. According to this link it depends on the product. Most metal roofing is not very thick. Did you walk the roof? I would definitely call out the lack of a membrane.
Could this house be a converted shed?
Up here in wet country, on a closed-in dwelling with heat, some kind of sheathing would be recommended, and even 15 lb felt is better than nothing.
But just tin on strapping is pretty common for sheds and workshops with lots on open air under them. Makes it easier to find the leaks after a windstorm!
