Calculating sub-base cubic quantities - Calculating sub-base cubic quantities

[jtaaffe]

Hi all, what an excellent site this is! Some excellent info, but have a question regarding Calculating Sub-Base Cubic Quantities

I am going to lay a circular raised patio, 4.5 meter radius. I need to calculate the required amount of sub-base gravel and sharp sand. I have gotten this far -

area of a circle = radius2 x pi
area of a circle = (4.5 x 4.5) x 3.1415927 = 63.617252175m2
63.617252175m2 = 64m2

I am only laying 1/4 of the total circle, so 1/4 of this area
64m2 / 4 = 16m2

I want to lay sub-base gravel to a depth of 85mm and I want to lay sub-base sharp sand to a depth of 35mm

What I need to know is, firstly the cubic meter quantity and what this relates to in ton and tonne

Any information or assistance is really appreciated

Thanks for your time

Jonathon

[IanMelb]

Cubic meters is just your area (in m2) multiplied by your depth (in m)

The second and third calculators on this page should help with the weight ...

[jtaaffe]

Many thanks Ian for the info. Just what I was looking for

[bobbi o]

10.5t of type one and 6t of sand approx.

[nelly05]

10.5t of type one and 6t of sand approx.

Umm

Working off the calculators provided, and assuming you are only laying a 1/4 of the foundations to do 16m2 you would need:-

2.7te type 1

1te grit sand

Bobbi o's figures would be if you were doing the whole 4.6m circle (64m2)

Regards

[bobbi o]

yeah that was based on 64sq.m,divide my calc by 4 and you shouldnt be far off