Metal Roof Over Osb

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

Metal roof over osb.

Metal roofing screws need to go into framing. Unlike a house. I guess at 14x16 you won t be towing this one but the wind still blows and osb does not have adequate holding power to resist the wind trying to rip the metal roof sheeting off. As the result they are stronger and basically water proof.

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. Osb is made out of strands of wood chips and chemically engineered materials to glue them together. Table 2304 7 3 gives the 7 16 osb the ability to carry a roof live load of 40 psf pounds per square foot when spanning the same 24 inches. Snap a vertical chalk line 1 4 inch from the rake edge of the roof using a chalk box.

Install the roofing screws vertically along each rib in the panel. 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. For the roof we are hanging 2x6 in metal hangers and will screw the metal siding into them. We are skipping the osb on the walls and the roof all together.

Install the first metal panel on the low end of the roof square to the eave. Ensure that the line is square with the eave. April 3 2017 filed under. From the 2012 ibc international building code table 2304 6 1 over framing spaced 24 inches on center 7 16 osb fastened with 8d common nails six inches on center at the edges and in the field will support a maximum design wind speed vult of 110 mph miles per hour in exposure b or 90 mph in exposure c.

And i am tired of taking chances. However the board is lack of natural moisture inside and won t dry as quickly as plywood. Osb is widely used as roof decking material. A potentially easier option is to use purlins on top of the rafters rather than framing between the rafters.

Wind can get under these roofs. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof line.