Does Shed Floor Need Exterior Plywood?

Answer:

The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. This type of plywood won’t sag when used on a 12 inches joist structure. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface.

Answer:

The best material for the shed floor is pressure treated 3/4 inch construction grade exterior plywood. Being pressure treated means wet tools or snow from the snow-blower or your boots, won’t damage the floor. It also will protect the floor structure from moisture too. I stay away from tongue and groove as it leaves a gap that collects dirt.


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Frequently Asked Questions

Do I need treated plywood for shed floor?

Ordinary exterior-grade plywood is made with weather-resistant glue, but the wood itself is not particularly rot resistant. This is why pressure-treated plywood is best for a shed floor. Even a floor that's raised off the ground a bit will last longer if it's made with pressure-treated plywood.

Is OSB or plywood better for shed floor?

OSB is good for a shed floor construction because it is flat and free of knots. It is also more consistent than plywood and other flooring materials because every sheet is the same.

Is OSB OK for shed floor?

Using Oriented Strand Board is a tested way of reducing costs for building your shed. Plywood with similar properties currently costs about 30% more for an equivalent thickness.

Can you use 2x4 for shed floor?

If building on a foundation other than a treated wood frame, you will need to acquire 8 units of 12 ft long pressure-treated 2x4s to put under the shed for floor joists, and shorten them to 11' 10.5”.

What kind of plywood to use on a shed floor?

The recommended shed floor plywood thickness is 3/4 inch pressure-treated exterior-grade CDX plywood. This type of plywood won't sag when used on a 12 inches joist structure. It is rot resistant with knots replaced with football shaped plugs to give it a smooth moisture-resistant surface. Also Know, what is the best floor paint?

What kind of flooring do you need for a shed?

Click here if you want to build your shed on a concrete slab. If you live in an exceptionally wet area or have a major termite problem you might want to use pressure treated wood for the entire floor including the skids, the floor joists and the plywood sheeting.

Which is better for a shed, OSB or plywood?

To be fair, there is “waterproofed” OSB on the market, but you’ll still need to treat the cut edges. Otherwise, the boards will come apart at the seams. If the choices are plywood or OSB for your shed floor, the plywood wins every time. With a proper moisture barrier, this can be the best floor you could build!

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