How-to-install-metal-roofing-over-osb, hello there,i am about to have a contractor put on a metal roof on my house in central florida.he is going to removing the old shingles,then placing a moisture barrier on top of the osb then the metal roofing .i have seen many other contractor use 1 x3 strips on top the barrier , then metal which i think is stronger because the 1 x 3 strip are screwed directly to the rafters every 24 - 36 .... This video is all about the workshop roof. first i haul up several sheets of osb and get it screwed into the trusses and blocks. then i get the ladders on the back of the house finished. after ..., standing seam metal roofing vs corrugated screw down metal roof - big differences between the two - duration: 9:27. exterior pro roofing 7,257 views.
*the sheathing is not required structurally and therefore it is an over-build and over-spend -- unless your insulating between the top cord of the trusses and need a top deck to attach and/or contain the insulation -- unlikely with trusses., rotted, sagging areas in your roof's plywood decking should be replaced prior to installing metal panels in order to prevent costly repairs in the future. ensure that the plywood deck is strong enough to withstand the added weight of the metal panels..
Re: metal roofing screws into 7/16 osb roof decking i think 5/8" is the minimum thickness that metal roofing needs to be applied over. find a copy of the install instructions from the manufacturer and follow those (if you still can). you may have just voided any warranty that came with the metal by putting it over 7/16"., in order to avoid a “hump” at the transition from two layers of materials to one, the notation on the building plans advises to lower the roof purlins in these areas by 7/16”. then the top of all your purlins, once osb under metal roof panels is placed – will be in the same plane and the roof steel will lay flat. mike the pole barn guru.
Metal roof .. osb problems . posts: 148. location: south central idaho. posted 9 years ago. my metal roof is eight years old and while cleaning the chimney i noticed some screws backed out and others loose. while ...