Gravel Base Under Concrete Driveway

Each 50 pound bag of quikrete all purpose gravel yields approximately 0 5 cubic feet of gravel.

Gravel base under concrete driveway.

The recommended gravel base for a concrete driveway. The strength and durability of a concrete driveway are not only determined by the type of concrete mix but also by base or sub base over which. For an area of 280 square feet at 4 deep you will need 93 1 3 cubic feet of gravel or 187 50 pound bags. Excavate the soil to a depth of 8 inches allowing 4 inches for the gravel base and 4 inches for the concrete slab.

The soil should be graded or sloped so the excavation site s center is. What type of gravel under concrete slab. The base course material according to aci 302 concrete floor and slab construction should be compactible easy to trim granular fill that will remain stable and support construction traffic aci 302 recommends material with 10 to 30 fines passing the no. Yields will vary with waste uneven subgrade etc.

It is definitely not a proper base for a driveway it is too mobile has low bearing capacity moves about under load especially if very dry or very wet and will cause structural cracking of your driveway. A concrete driveway must be installed on solid stable soil otherwise it will eventually fail reducing the life span. Excavating and adding base material or any other type of structural base to unstable sub grade can stabilize the soil and in turn will lengthen the life expectancy of the concrete driveway. The sub base is the bottom layer of crushed stone that will sit on top of the subgrade.

The base is a layer that also consists of crushed stone but slightly smaller stones than the sub base in some cases stone. 100 sieve with no clay silt or organic materials. Concrete for a 15 foot square slab how to lay a gravel shed foundation water leak under a concrete slab building a greenhouse foundation gravel vs concrete shed base which is concrete for a 15 foot square slab.