i need to lay a concrete base 24' x 14' x 6" above ground, how deep should hardcore be?

Question

how deep should the
sand layer be? and should the concrete start below ground?

Answer 1

Why are you introducing a sand layer? This is only typical where you are paving. The purpose of the hardcore is to make sure that the concrete slab will not move under it's own weight when laid and as some pieces of land are less stable than others the depth of the hardcore will vary according to the earth you are building on. The best course of action is to put about four inches of hardcore down and wacker plate it into the ground, repeat the process until there is no movement and the area is solid, flat and reasonably level. Then apply the concrete straight onto the hardcore, as the base is a little on the large side I personally would reinforce concrete with steel. There is no reason why the base has to start below ground, although most people prefer it to as it will look that much of a tidier job.

Answer 2

You need to allow an additional six inches all the way round. For example for an 8ft6 x 16ft3 garage you will need a base with the following measurements 9ft wide x 16ft 9 long A concrete base requires 3 inch (7.5 cm) of compacted hardcore underneath the 3 inch (7.5 cm) concrete layer. The base can be level with the ground or raised above it. If it is to be level excavate the top earth to 6 inch (15 cm) to allow for the hardcore layer and 3 inch (7.5 cm) thickness of concrete. Set up levelled formwork. This involves measuring, cutting and fitting timber, to the shape of the base in order to contain the concrete (as shown in the diagram).
spread a layer of well compacted hardcore and cover with a liberal amount of sand.
Next, mix concrete using one part cement to five parts ballast or use bags of dry-mixed concrete to which you just add water. Small amounts of water should be added at a time and mixed into the concrete mix to ensure excessive amounts are not added making the cement sloppy, as the concrete should be kept on the dry side.
Hope this is enough for you

Answer 3

The manure needs to age at least six months, or it will 'burn' whatever you try to plant in it. If I were fortunate enough to have all those raised beds, I'd fill them with the manure and let it sit until next spring. I'd turn it some whenever the weather made that an easy task. Then, just a week or so before planting, I'd add some worms to the manure/soil. If you can cover the manure with a layer of fallen leaves or other compostable material, all the better.

Answer 4

Not sure where you live but in Ohio you need to be below the frost line wich is 36" with concreat. Dont think sand will work it can hold moisture and can freeze. If you are building on it if it is just a slab for apatio then get below the top soil with sand or gravel and you should be fine

Answer 5

It does not essentially have to be below ground it depends what it is for though?
But the hardcore or MOT(Crush an run) should be 3- 6 inches dependant on what its for weight loads etc..

Answer 6

6" of concrete is very deep,you should not need much sand or hard core if any.

Answer 7

Um I'm not sure but from what I've seen Hardcore goes pretty deep.

Answer 8

I know some nice irish pikey's who will do it for, they lay about half inch of hardcore, and charge you £5000.
Tarmac yer drive guvnor, ooh to be sure to be sure

Answer 9

just over 1 foot