Calculating foundations

[Monkey Mark]

Afternoon all,

I'm currently calculating some founds for a dwarf wall. I've just calculated the following, does it sound about right?

4 meters long, 60mm wide, 300 deep.
10x 25kg bags of cement
432kg sand
864kg aggregate

Didn't expect there to be quite as much cement involved.

 

[finneyb]

Assuming 4:2:1 mix you are right - maybe 9 bags of cement if you want to be precise.

Brian

 

[skipdiver]

I make that almost three quarters of a cube, which is about 1.5 tons of mixed ballast and 9 cement.

 

[Homers double]

Afternoon all,

I'm currently calculating some founds for a dwarf wall. I've just calculated the following, does it sound about right?

4 meters long, 60mm wide, 300 deep.
10x 25kg bags of cement
432kg sand
864kg aggregate

Didn't expect there to be quite as much cement involved.

you might want to make your trench a bit wider, I'd struggle to dig a trench 60mm wide and 300 deep (hammer)
Your calcs are about right for a 600mm wide trench but as skipdiver mentioned use 1 & 1/2 tons of ballast.