Roof Plywood Too Short

When it s too thin.

Roof plywood too short.

Most of the time this type of repair is unsuccessful because the screws used to secure the plywood are too short. 30 years on it s working out fine. Boards used for sheathing range from those with a 4 inch face to 48 inch long plywood sheets. The new plywood will have to be nailed to the rafters or roof trusses.

Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood. If the roof dips here and there because of the thin plywood the 1 8 jump may no be so bad in the mix of it all jack jul 26 16 at 4 24 here in snow country 1 2 osb is standard with 7 16 being common for walls. The number of nails needed for a roof varies on multiple factors such as board face width length and roof truss spacing. A structure s roof truss spacing can vary from every 12 to 24 inches.

But with the old plywood left in place it will be considerably more difficult to locate the rafters to ensure proper nail. The minimum plywood for roofing. If the plywood thickness is less than or the osb less than 7 16 it is going to be weak with the roof rafters spaced the standard 2 on center. Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.

Installing plywood on a roof hello youtubers here s another video about plywood sheathing and composition shingles after replacing all damaged wood and.