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Groundwork & Foundations
Building sand in concrete foundation.
I have poured a concrete strip foundation, 450mm wide and 200mm depth and good sub soil.
I used 1 part cement, 2 parts building sand and 4 parts 20mm concrete gravel and enough water to make it workable.
It is for a 1/2 brick thick shed, 2250mm in height.
Will that be a suitable foundation in regards to compressive strength etc.
5 Answers from MyBuilder Groundworkers
Best Answer
have you put any reinforcements in the base ‘ depending on amount of weight going on the base single or 2nd story building
I would suggest putting some 6mm or10 mm mesh in their with same width rebar around outside of the slab.
Your depth of concrete seems fine but i use a 2 3 4 method for extra strength.
Answered 30th Jul 2020
I wouldn’t recommend using building sand in any concrete especially a foundation you should use grit sand
Answered 20th Jul 2020
You should use sharp sand or ballast in concrete mix
Answered 30th Jul 2020
That mix should be fine as thought many years ago mix 4x2x1 aggregate sand OPC use buckets for correct measures this should arrive a value of 21nwt good for standard footings
Answered 17th Nov 2020
The footing will be weak if mixed with building sand, it won’t bind together like grit sand
Answered 20th Jul 2020
