Building a shed floor is actually pretty straightforward. for many handymen, it�s a doable job in a day and a half, from picking up the materials to fastening the final screw. using 3/4 inch thick pressure treated plywood for your shed floor is the most economical choice and will last you 20+ years if done well.. The floor should be 3/4" thick. i would use advantech instead of plywood. if you are going to put siding on the shed you can use 1/2" plywood for the walls. another option is 5/8 t1-11. the roof should be 1/2 or 5/8 plywood.. Shed floor and plywood thickness? i know 3/4 inch treated plywood is the norm for the floor of a shed. if i have access to 1/2 inch treated plywood, what are the pros and cons of doubling up on the 1/2 inch plywood to go for a thickness of 1 inch?.
Pressure-treated plywood is an exterior-grade plywood that will resist rot and decay for a lifetime. it is the preferred flooring material for an outdoor shed.. Plywood shed flooring is usually 3/4 inch and osb 5/8 inch thick. subject to moisture the major disadvantage of osb as shed flooring is that it is more susceptible to moisture, especially at the edges.. Cdx plywood is the most economical choice for decking your shed. for those of you that don�t know, cdx means that the plywood has a c face and a d face (a being the best). the x means that is has exterior grade glue..