Which Direction Should Plywood Go On A Roof

One of the most important factors when selecting the plywood for your roof is how thick each piece should be.

Which direction should plywood go on a roof.

On center the irc wants the panels installed with their strength axis perpendicular to supports in other words horizontally to handle wind pressure. Place 2 pieces of wood about 8 foot long on the roof rack on the lengthwise. Plywood thickness for the roof. 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.

Provide a 1 8 inch gap. Remember to place a distance of about 3 to 3 foot in between. If you re using 3 ply plywood panels of any thickness on studs spaced greater than 16 in. Align the long edge of the sheathing with the ends of the.

The strength axis is usually the long direction of the panel but the grade stamp will indicate it. Secure it to the roof rack. This happens because there is no other direction for them to go to relieve the swelling pressure. Contact the manufacturer of the product you re going to use for more information.

Roofs the minimum osb panel size is 24 inches in any direction and each sheet end must rest on a rafter. The face grain usually runs parallel to the eight foot side on a 4 x 8 piece of plywood. Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. Like most other things there is no one right answer for the plywood thickness of your roof.

The humps and bumps in the roof cause the light to be reflected differently from the ceramic granules on the shingles. Plywood is a bit more expensive but is usually stronger and is often selected in cases where the roof covering is heavier such as for slate clay or concrete tile roofs. Oh and remember to prepare two other pieces of wood for later use. If you install plywood sheets tightly against one another the edges tend to pucker upwards when they expand.

If used for floor or roof sheathing where the primary purpose is to carry loads perpendicular to the face of the sheets then it must be placed with the long direction of the sheets perpendicular to the supporting joists or rafters.