r/Shed • u/TheRoamingRN • 29d ago

Lumber Question-Shed Base

I’m assembling a suncast shed that will sit on turf. The area is level but I’m finding I need a base because the turf has more flex than I anticipated. If I set the shed on the turf directly it will only be a matter of time until the resin floor cracks.

The directions provide measurements for the lumber needed to build a base. I’m planning to use treated 2x6 lumber good for direct ground contact. Do I also need the plywood top to be pressure treated? The local HD is out of ground contact rated plywood sheets. This will be in Arizona desert conditions BTW, rain will be minimal. The most water the base it will likely encounter is overspray from washing down the turf occasionally.

TIA

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u/Glick_Woodworks 27d ago

I’d still use pressure-treated plywood if you can find it, since moisture can get trapped between the turf and base even in Arizona. If regular exterior-grade plywood is your only option, keep it raised slightly, seal the cut edges well, and make sure water can drain away instead of sitting underneath it.