How To Install Metal Roofing Over Osb Board

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. 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. 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.

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This is why those manufacturers that do approve of application to osb recommend a minimum 12 or 14.

How to install metal roofing over osb board.

Work toward the ridge. Install osb panels on aligned roof trusses. When the steel roofing can t carry the load other shear carrying materials such as 7 16 osb may be added to the assembly. A sheathing grade plywood will hold screws better than an osb board of similar thickness probably 2 3 times.

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. Install the first metal panel on the low end of the roof square to the eave. Begin on the left side of the roof working to the right. Find a copy of the install instructions from the manufacturer and follow those if you still can.

In the case above the shear forces in the last 12 foot bay at each end of the roof have had osb placed between the roof purlins and the steel roofing. 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. The good news is that there are many different solutions in terms of installing metal roofing panels including tin aluminum and steel. Overlap the edge of the roof by 1 inch.

Ensure roof trusses are in proper alignment with no curves or uneven sections when installing osb to sheathe roofs. April 3 2017 filed under. Metal roofing roofing answers roofing installation roofing materials oriented strand board commonly referred to as osb is a type of engineered lumber similar to particle board formed by adding adhesives and then compressing layers of wood strands. You may have just voided any warranty that came with the metal by putting it over 7 16.

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.

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