Depth of hardcore for patio base

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Hi all,

Can you advise what the minimum depth of hardcore I can get away with would be. Patio will only have foot traffic.

I'm trying to keep to a minimum as I don't have access to my garden so I'm having to carry it by hand through the house, so trying to reduce the strain

thanks
 
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It has to be at least twice the depth of the largest particle. In the mot mix I think. Probably 75mm.
 
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Depends on the ground, if it's pretty solid because there has been a patio before and you're putting down council slabs then you can get away with next to nothing, just the bedding/laying course.
However if you've dug out a load of shrubs and it's full of soft patches and you're putting down thin 20mm sandstone you'd need to scrape them all off and lay a decent layer of hardcore to make up the level, at least 75mm as above. Then whack it down with a proper machine.
We did 75mm on the ex- lawn area, and whatever we need to make up the level on the ex-concrete drive area if any. So far it's going ok! But we will find out any issue in future.
 
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