Couple of comments..
First the altitude of the shop floor is your major concern.... if you can
live with it above the current grade there is no harm in building it up....
BUT.. you do have to have some form of footer which maintains the
monolithic slab in the same location over time....This is a 12-18" deep and
wide trench around the outside of the slab.
Second as for the Plastic between the base material and the Concrete....
The Plastic serves two purposes.... one it keeps the moisture from under
the slab from migrating through the concrete to a Carpet....( not seeing
this as an issue ) and secondly it prevents the water in the concrete mix
from seeping into the base material during the pour thereby allowing the
concrete mix design to be stable during the pour and the subsequent curing
period.
Keith
----------
> From: Conrad <conrad@conrad.uk.net>
> To: 'shop-talk@autox.team.net'
> Subject: Slab for an outside lift
> Date: Monday, February 25, 2002 6:14 AM
>
>
> Hi again all in here.
>
> For various OT reasons I have decided to put my 3 tonne 4 post lift
outside
> and to use a 2 post inside my barn-to-workshop conversion.
>
> So, I need to make a slab for it. I think probably the same 6 inches of
> hardcore and 6 inches of concrete is probably still fine, but I wondering
> about how to lay it seeing as there wont be any walls around it. Should I
> just level the gound off and put the hardcore straight onto that, or
should
> I 'sink' the whole thing into the ground? Cant really see any need to do
> that. Should I still blind the hardcore and put the plastic sheet between
> hardcore and concrete?
>
> The ground gets very soft in the winter, so I figure I need to make the
> hardcore base quite a lot bigger than the concrete slab. What I don't
know
> is how much bigger the slab needs to be than the lift? Should I allow say
1
> foot all around, something like that?
>
> Thanks,
>
> Conrad
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