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How Much Gravel Under Concrete Slab?

How much gravel do you put under a concrete slab? You will need 3 inches of gravel under a concrete slab that is 4 inches thick. More gravel is better, but 3 inches is the minimum amount of gravel you should have with a 4” slab. Use ¾” washed and screened gravel, then compact it to level.

How Much Gravel Under Concrete Slab?

When it comes to pouring concrete slabs, there is one question that many homeowners and contractors alike often ask:

How much gravel should be put under the concrete slab? Depending on the situation, the answer to this question can vary. When installing a concrete slab, its important to understand the purpose of gravel used beneath the slab.

Gravel is used beneath the concrete slab to provide a level surface and to help with drainage. The gravel also helps to prevent the soil from shifting and settling, which can create an uneven surface and cause the concrete slab to crack.

When youre determining how much gravel to put under the concrete slab, there are several factors to consider. First, you need to consider the size and weight of the concrete slab.

Generally, for a standard 4inch concrete slab, youll need about 4 inches of gravel beneath it. This will provide enough support for the slab and help to ensure that it doesnt shift or settle over time.

Second, you need to consider the type of soil youll be pouring the concrete slab on. If the soil is sandy or loamy, you may need to use less gravel. However, if the soil is claybased, you

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