A structure s roof truss spacing can vary from every 12 to 24 inches.
Roof plywood too short.
Longer screws would come through the surface of the shingles where the roof could.
30 years on it s working out fine.
Plank sheathing usually 1 6 or 1 8 was used as a roof deck before plywood.
Boards used for sheathing range from those with a 4 inch face to 48 inch long plywood sheets.
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 new plywood will have to be nailed to the rafters or roof trusses.
Most of the time this type of repair is unsuccessful because the screws used to secure the plywood are too short.
Rafters run from the peak of the roof.
The number of nails needed for a roof varies on multiple factors such as board face width length and roof truss spacing.
Roofs are framed with rafters or trusses which are rafters joined by internal braces so they install as a single component.
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.
The minimum plywood for roofing.
What is plank sheathing.