How To Install Metal Roofing Over Osb Board

Begin on the left side of the roof working to the right.

How to install metal roofing over osb board.

Install osb panels on aligned roof trusses. Overlap the edge of the roof by 1 inch. April 3 2017 filed under. 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.

Oriented strand board or osb roof sheathing is a preferred material for roofing because of its strength and low weight avoid the errors described when installing this roof sheathing. Find a copy of the install instructions from the manufacturer and follow those if you still can. Ensure roof trusses are in proper alignment with no curves or uneven sections when installing osb to sheathe roofs. In many cases it makes sense to remove an old or dilapidated roof and install a metal roof that is better able to withstand the elements.

The good news is that there are many different solutions in terms of installing metal roofing panels including tin aluminum and steel. A sheathing grade plywood will hold screws better than an osb board of similar thickness probably 2 3 times. Work toward the ridge. Secure the metal panel to the deck by drilling 1 1 2 inch galvanized metal screws through the peak of the rib in 12 inch to 16 inch intervals.

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. This is why those manufacturers that do approve of application to osb recommend a minimum 12 or 14. Install the first metal panel on the low end of the roof square to the eave. Further if one was to use improper screws that were too long or undersized then it will have a bearing on the life of the attachment.

When the steel roofing can t carry the load other shear carrying materials such as 7 16 osb may be added to the assembly.