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ratio of hardcore to concrete

Posted: Fri Jul 19, 2013 12:22 am
by austind
I'm looking to lay a slab of concrete up to 9 inches thick for a summer house, can someone let me know what depth the hardcore/scalpings needs to be under this layer. The thickness of the concrete is determined by a raised patio onto which the summer house doors open.

Thanks

Re: ratio of hardcore to concrete

Posted: Fri Jul 19, 2013 10:19 am
by welsh brickie
for a concrete base that thick, you will need reinforcing mesh to stop it from cracking, not a lot of hardcore is required unless the ground is constantly wet, 50mm thick will do, but it must be well compacted, so hire a plate compactor for the job.

Re: ratio of hardcore to concrete

Posted: Fri Jul 19, 2013 3:00 pm
by austind
Thanks. Reinforcing mesh is on my list of materials and I have a whacker lined up too.