Installing Metal Roof Over Osb

Work toward the ridge.

Installing metal roof over osb.

Before you install metal roofing repair any damage to the wood under the shingles. 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. Overlap the edge of the roof by 1 inch. Install the first metal panel on the low end of the roof square to the eave.

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. 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. If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. Installation manual for dc rib metal option 2 install metal over solid decking trusses with 5 8 osb or plywood decking use synthetic felt 30lb felt paper 1 4 styrofoam roofing nail pattern for d c. Place corner pieces where panels will meet bends at the edge of the roofing. Rib metal panel fetch full source.

Next use 1 inch nails to secure some metal edging to the perimeter of the roof. April 3 2017 filed under.