Which Direction Should Plywood Go On A Roof

If you re using 3 ply plywood panels of any thickness on studs spaced greater than 16 in.

Which direction should plywood go on a roof.

Be very careful on hip roofs along the hip to make sure the strength axis does not mistakenly get parallel to the supports as that may result in the panel exceeding the maximum span allowed for that thickness. Provide a 1 8 inch gap. Contact the manufacturer of the product you re going to use for more information. Secure it to the roof rack.

This happens because there is no other direction for them to go to relieve the swelling pressure. 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. Lay sheets in rows with the long edge horizontal to the roof bottom. Oh and remember to prepare two other pieces of wood for later use.

One of the most important factors when selecting the plywood for your roof is how thick each piece should be. The strength axis is usually the long direction of the panel but the grade stamp will indicate it. Align the long edge of the sheathing with the ends of the. The humps and bumps in the roof cause the light to be reflected differently from the ceramic granules on the shingles.

Osb is lightweight relatively inexpensive and strong enough to resist bending or breaking should someone walk on the roof. The irc meanwhile allows you to orient the sheathing in either direction for wind loads but includes an important exception. Plywood thickness for the roof. 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.

If you install plywood sheets tightly against one another the edges tend to pucker upwards when they expand. On center the irc wants the panels installed with their strength axis perpendicular to supports in other words horizontally to handle wind pressure. Remember to place a distance of about 3 to 3 foot in between. The face grain usually runs parallel to the eight foot side on a 4 x 8 piece of plywood.

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.