1 - 1/8 Inch Plywood
1 - 1/8 Inch Plywood is used for stair treads and landings. This plywood is not used for stair risers. The 1 - 1/8 Inch Plywood is a great choice for interior stair treads but if used outside could delaminate or fall apart.
8d Nails
16d Nails
3/4 inch Plywood
Plywood Thickness