many questions about repairing/replacing stringers

[carboncow]

Dan,

Any to be clear...you are doing your stringers in 3/4" plywood? Marine grade or standard? We've been getting mixed info on this but we seem to believe if the plywood is heavily resin'd then it doesn't need to be marine.

Will your stringer needs be greater then the length of plywood (assuming 8ft) and if so doesn't it matter how they "butt" to the next piece?

thanks.