Roof Sheathing Direction

Align the long edge of the sheathing with the ends of the.

Roof sheathing direction.

This opens the door to the possibility of water damage by letting gravity work against you. Properly fasten panels including fastening and spacing hints step 4. But if you snap it at 40 inches then the sheathing will not project over the subfascia or true fascia. Position the first piece of plywood or oriented strand board sheathing on the bottom edge of the rafter tails at one end of the roof.

Wind loads perpendicular to a wall are similar to floor and roof loads and installing sheathing horizontally makes walls better at resisting wind pressure. When you think of using a diagonal brace to support a wall you want to get both ends as far apart as possible. The surface stamp indicated that the strength axis of the panel ran in the long direction see photo below. It spans the rafters to support the roofing and in the case of panel sheathing such as plywood or osb it acts as a diaphragm with the walls to resist horizontal loads.

Check the nailing surface is level step 2. Why is the strength axis important for roof sheathing but not for corner. On roofs and floors sheathing is installed perpendicular to supports because this is the orientation that results in the strongest roof or floor. When sheathing a roof the first step is to snap a line so that the first row goes on straight.

Cover sheathing with. The main one is the structure turning into a parallelogram where the studs are no longer perpendicular to the ground. And scroll down to see more details on each with installation hints and tips below. Ventilate the roof according to current building codes step 3.

The same policy goes for roof sheathing as for hanging drywall you get more strength by spanning more rafters joists studs and offsetting the joints. How to correctly install plywood or osb roof sheathing. Roof sheathing attaches to the surface of the rafters or trusses to form the structural skin of the roof. When the roof sheathing is used as a structural diaphragm as it typically is in high wind and seismic hazard areas the structural integrity of the diaphragm can be compromised by a continuous vent see figure a below left.