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Concrete for a greenhouse base (feddit.uk)

submitted 2 days ago by Cyber@feddit.uk to c/askuk@feddit.uk

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Ok, this seemed like a simple one, but damned if Google / Youchoob will give me a straight answer...

I'm putting up a greenhouse in a clay soil garden, so I want a nice concrete foundation (ring, like for a house, not a slab)

What mix do I need for that base, assuming it'll be underground / water and I'll put a row of block on top for the base to screw in to?

And... if it's easier than dragging stuff through the house, can I get away with just bags of postcrete?

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[–] Setiyeti93@lemmy.ca 8 points 2 days ago (1 children)

So advice from someone who has erected a few garden buildings. Greenhouses included. Particularly on a clay rich soil.

Use the pre mixed high strength stuff:

this stuff or equivalent

As the clay dries under the greenhouse it will shrink and you want the concrete to be able.to survive a few small voids. The 40kn stuff has never let me.down.

Also, If at all possible. You may want to drive some stakes (even rebar would help) into the ground before you pour over.

The more work you put in now the better. A solid base will pay for itself in the long run! DM me if you have other questions.

[–] Cyber@feddit.uk 2 points 1 day ago

Ok, now this seems like the answer I'm looking for.

I'd not thought of adding any spikes in, but seems like a good idea, it's amazing how much the ground moves and changes.

Thanks