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Carol Fey 09-03-2012 07:56 PM

Do I need to build a base for a plastic shed?
I just purchased a 7x7 plastic storage shed for my back yard and I am told that I should build a cement base for it. Is this true? And how do I go about that?

joecaption 09-03-2012 08:17 PM

#1 Never in a millon years buy a plastic shed, I have how ever been paid to haul a few away after a storm when they blew apart.

Your going to have to have something level and flat for it to set on or it will stay out of wack and not be able to open the doors because there so flimsy, and love to blow away.

There's several ways to do it, level the area with #57 stone and use patio blocks to build a frame on top of like for a deck, making sure it's the same size as the shed so water does not get in under the wall and cover with Advantec subflooring.

Or form it and pore a concrete slab making sure it's 4" thick and is raised enough to be 4" above the grade.

allthumbsdiy 09-03-2012 10:36 PM

I agree with Joe about those plastic sheds.

Regarding a concrete pad, I would first call your township's building or zoning department to see if there are any requirements or recommendations.

For a light and small shed such as yours, my township simply wanted some type of ground anchor so that in case of a wind storm and/or hurricane, the shed did not become a projectile.

user1007 09-04-2012 05:49 AM

If you can, take it back and get something more stable.

As discussed, you need some sort of permanent base to anchor it. The problem is even with metal washers or strips on either side the plastic will fracture as it ages.

As for pouring the slab, read up on forming concrete. Your problem is you will probably have to do it yourself or corner a concrete company working in the area anyhow since it is a small project. Be flexible with your schedule.

The good news is it is a storage shed base and as good a first concrete forming and finishing project as you are going to get.

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