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we do them for a few hot tub companies and its normally a 100 to 150mm deep concrete base with a sheet of rebar in dependent on the size of the tub
I have another client who has one which is about 3.4t stood on a standard patio 100mm sub base 35mm bedding layer and 25mm granite slab.
Client didn't really want a concrete slab
It's not that heavy!
The only issue I can foresee is with lots of rain the fines washing through but that's it.
The problem I see is that water has this uncanny knack of finding it's own level and immediately showing up any movement! I'd go concrete base every time.
yep as colin says. see how spot on level you can get an mot base. There is a reason the hot tub companies ask for a concrete base, one of which is to ensure its level. also a concrete base, ensures that the base doesnt get stressed, as it can do if there are any uneven points. Personally id go with what the company suggests. from bitter experience, engineers of all sorts are a pain in the bum when it comes to working in gardens, as they are a different breed, who have no place in the garden!
But I do think people try and over engineer things if they get half a chance.
A concrete base can move too remember
Mine don't! ;-)
seconded!
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