Concrete mixes

[Kwackboy]

I need to lay a concrete base for an Aga range which weighs approximately 408kg. What mix of ingredients would be required eg. the ratio of cement, sand etc ?, and how deep ?.

 

[Static]

What is the base going on top off? a concrete floor, a timber floor, natural soil?? and how big is the unit/base on plan?

 

[Kwackboy]

The base of the Aga is 987mm x 680mm. The floor is concrete of around 3 inches thick but I don't know how strong.

 

[Static]

Suspended floor (if known)? also what kind of room is it in (ie commercial plant room, domestic kitchen, hallway in block of flats?

 

[Kwackboy]

A ground floor domestic kitchen. The concrete floor is around 3 inches thick, below this there seems to be a couple of inches of polystyrene and then some reasonably solid hardcore.

 

[noseall]

it sounds to me as though you have a regular insulated floor slab.
this ought to be minimum 100mm (4 inches) thick.
this may seem stupid , but how do you know its only 3 inches thick.
have you excavated the area upon which the aga is sitting?

 

[Kwackboy]

I had to dig into it a few days ago on another project to do with plumbing, but since you have asked I have now measured the depth and the concrete is is 4 inches deep.The area where the Aga will sit already had a base for an Aga but the previous owners of the property had the base at 6 inches which is to high. I have had to kango the based down to floor level and now need to relay the base, its just the strength of concrete that concerns me.

 

[noseall]

a 100mm cured concrete slab, intact, would easily support the weight of an aga.
who has told you to build a separate base?
does the aga need to sit on an elevated base?

 

[Kwackboy]

Yes the Aga needs to go on a base in order to bring it up to worktop height. Its just the mix of the concrete I am not sure of. I am assuming the concrete would have to be a strong mix.

 

[noseall]

six parts ballast (sand and gravel mixed) to one part cement, mixed together with water.
allow it to cure properly. over time it will be as hard as bell metal