Struggling with Working out Volume to Extend Concrete base Post your questions and get answers regarding all areas of drives, pathways and patios

[seaneylad]

Went online calculator and states i need just shy of 1tonne of dry mix in 25kg bags from the likes of wickes/b&q surely cant be right.

Im extending a concrete base. roughly a little 2x2m with 100mm (10cm) depth as shown,
Lost on how much all in one dry mix i should get to complete the job with a mixer?

anyone able to help / point me in the right direction ? online calcuators dont look/sound right? :S

Cheers

[diydoctor6]

I guess you have tried our concrete calculator:

https://www.diydoctor.org.uk/projects/mi ... ncrete.htm

Using your measurement you will need the following amounts (C20 Mix):

Cement: 256 kgs
Sharp Sand: 480 kgs
Gravel: 960 kgs
Water (litres): 141 ltrs

Here is more information on building a concrete shed base:

https://www.diydoctor.org.uk/projects/shedbase.htm