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That should be fine, IIRC - 50m & 100m aren't unheard of.
When I did the calculations, the tipping point was a relatively small slab. Smaller, when you factor in how much I couldn't be fucked to mix that much concrete.
With a pour, you may also get someone with the rest of the tools, like the vibrateywand, and a proper floatythings.
@Hovis has recent-ish experience of domestic roasdside pours.
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how much I couldn't be fucked to mix that much concrete
This will be a big chunk of the balance. Although, I'd actually love to do it. Getting a full day where I'm not either working or beingabadparentandneglectingmydaughterrememberthistimeispreciousandifyouwasteitdoingthingstoimproveourfamilyhomeyoureabastardyoumonster is another thing. I can clear the area and maybe even shutter in 1 to 2 hour bursts.
the vibrateywand, and a proper floatything
I'm glad you know the technical terms, because I don't.
More not gardening.
I'll (hopefully) soon need to think about shed footings. I will maybe need a 17'x9' slab poured. It will be about 100' from the road but we do have access down the side of the house. Can concrete be pumped that far or would it be better just to get someone with a mixer in to do it on site? I don't have the time nor the inclination to be spending all day mixing and pouring myself. Wondering where the tipping point is in terms of cost for pumped vs labour.
Also, if it's for a shed, is it worth chucking rebar in or would a plain slab be OK? My last shed was only 8'x6' and sat on 9'x7'x6" of unreinforced concrete for 5 years with no issues.