The best plywood for installing under flooring may not be plywood at all. when used as flooring sub-floor or underlayment, osb runs neck-and-neck with plywood, according to the opinion of contractors, tradespeople, and other industry influencers.. Osb and plywood are both commonly sold in 4-by-8-foot sheets, but osb can be made in much larger panels, up to 8-by-24 feet. using larger osb panels can be an advantage when flooring a big or odd-size shed, reducing the number of joints in a floor.. This is a brand new shed. no stains. the underside is treated where it touches the ground (gravel pad), but the floor plywood is not. i made the point of my parents' shed because after almost 30 years, with the same construction (treated 6x6 and untreated plywood floor on a gravel pad), the ply is still fine..
I'm tearing down a 20x12 building and want to reuse as much of its lumber to build my 10x8 shed. i'd like to use the 1/2" plywood from the roof as the shed flooring, but 1 layer on top of the other.. So what type of plywood to use for a shed? use pressure treated 3/4 inch construction grade exterior plywood for the floor. it’s solid, won’t sag, and protects the substructure and is easy to sweep. on the shed walls use exterior rated 1/2 inch plywood for a waterproof finished look, and 3/4 inch cdx plywood on the roof for strength.. 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?.
