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Retroanaconda

New workshop project

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The ground does seem pretty good from what I've seen so far. I'll be putting steel in the slab for sure, probably two layers of mesh given it'll most likely be a 150mm slab. Unfortunately laying the sub base first and then digging out around it wouldn't work as on the low side it would need to be 150mm or so above current ground level in order to get the slab at the right height, and so would need retention of some kind anyway.

If I simply battered the excavation and sub-base I would end up with a slab of variable thickness across the site. Not sure if this is a problem though? Would obviously cost a bit more in concrete as you say but that's no major issue if it saves work elsewhere. This essentially does away with the idea of the 'walls' and incorporates them into one big mass concrete slab, and would certainly be the simplest method of construction. I would end up with something like this:

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I think realistically I need to break ground on it and see what I'm dealing with before I can design the thing properly - so once the planning is (hopefully) through I'll book a week off work, get a digger in and start making holes :i-m_so_happy:

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That is a lot of concrete - and the boxing will be under some serious pressure from the weight... Have a look - we used 6 IBC's filled with water to support the 40 cm. box to keep the concrete in..

I'd level it out with the sub-base (we use a sort of gravel for that) and pour a 10 cm. concrete slab with rebar..

Should be fine - and less expensive..

We used a few box sections in our ABRI just in case we want to build up the the walls with concrete blocks..

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My instinct tells me that pouring concrete on a slope is a bad idea, I have had shuttering move on me twice in life and it is a tough problem to deal with when the lorry is waiting. Levels and steps is better, or one big step at the back as you had above, I wouldn't bother with the interior shutter though, just a reasonable angle of repose would be fine. Don't underestimate the counter force needed behind that deep shutter at the back,..... maybe move all the spoil there and build a bank behind the shutter?

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Thanks. I'll probably go with the stepped option, as long as I can get the levels correct.

Good news is the planning permission is through so I can crack on, as soon as I have some time.

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Good to have the permission - now the hard work can begin...

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Started clearing the site this afternoon, the various bushes had an appointment with the chainsaw and were removed, releasing about seven billion midges in the process. A trip to the dump tomorrow will see it gone.

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The large grand fir behind the fence needs to come down too, but I’ll wait until the oil tank is moved before I fell that.

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Are you taking the fence out and ‘replacing’ it with the garage walls?

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No - the walls of the garage need to be about 300-500mm inside the boundary in order to allow for the eaves and the gutter to stay within my land, plus to facilitate access for installing and maintaining the cladding.

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