concrete strength for foundations ....help

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b21playa

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Need to order concrete for Saturday morning.

What strength should I ask for? I said c20 on the phone to which I was given a price of £205 cash for 2 cubic meters inc barrowing service.

Its for a 30sqm concrete block shed.

Thanks
 
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so long as it sets then you will be ok! :eek:

c20 will be more than man enough.

seriously, it would have to be pretty awful concrete for it not to be adequate.
 
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£125 first cube, £75 each cube after.

They will barrow it 50yards but ive got like 30m and need about 2.2cubic, and hoping they will sort it out
 
Should I cover the whole area with tarpaulin once concrete poured and levelled as its supposed to snow tomorrow night and i got the concrete coming tomorrow morning
 
Ah well, if you're happy, but seems a tad much for a cash job to me.

As for protection, it's in the ground, so less susceptible to the weather and it has no particular requirement for any great strength either, but covering it over won't hurt.
 
Shytalkz said:
Ah well, if you're happy, but seems a tad much for a cash job to me.

As for protection, it's in the ground, so less susceptible to the weather and it has no particular requirement for any great strength either, but covering it over won't hurt.
Click to expand...

I'll cover it just incase in snows heavy overnight while the concrete is setting.

Can we build onto it after a few days? Im hoping I can get the brickie during the week to come and start laying to dpc level.

Is a 3:1 mix good for below ground on blocks, and should I mix in frost proofer???

Appreciate the help

Thanks
 
As nose says.

1:3 fine, no need for additives, just don't go laying them in freezing conditions, cover with hessian at the end of the day.
 
I too have a query about concreting in the cold.
Planning to lay my garage raft foundation (6m x 6.5m) next Tuesday, forecast is 4deg daytime dropping to 1deg overnight.
Is this a bit risky?
Dave

PS Forecast is now -1 overnight!
 
2 degrees and falling, you shouldn't pour, if that's the forecast, hold off.
 
:idea: if that was my garage i would dig off the oversite with a mini digger before any blockwork is laid. :idea:
 
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