patios in St. Louis

Credit: Concrete patios in St. Louis

If you want to lay your patio using a type of concrete patio slab, it is a good idea to start the process by determining thee thickness of slab that will be needed for your patio. Sometimes, this can be a calculation and other times, it might be learning the type of thickness that your patio slab will need to be. Nevertheless, knowing the thickness of your patio slab is important to getting a good lay because they can affect the size of the corner brackets, as well as how much concrete  will be needed in order to ensure that the slabs stay in position for several years.

Work Out the Ratio

You will need to work out the ratio of concrete thicknesses before you can do anything else. The thickness of the slab must slightly be smaller than the area of the hole dugged into the earth to accommodate your slab. Also, you must fill the depth of the hole with gravel, a depth of about 4 inches is the industry norm. It is acceptable to have a patio slab of 50 percent concrete and 50 percent gravel base. This half-and-half ratio makes it easier to work out the correct ratio of the concrete.

Fitting Concrete into the Ground

A concrete slab should be laid completely into the ground, so that it is level with your topsoil. The benefit of laying your slab in the ground is that a greater thickness can be added to your concrete slab, as this will be supported by the gravel base and the surrounding turf. It is advisable to add an extra one or two inches of concrete to your slab so as to make it better able to support the weight of people standing or sitting on it.

Fitting Concrete Above the Ground

If you want to fit your slab above the level of your topsoil, then you have to consider a slightly thinner amount of concrete to be used upon it. This concrete can be about 4 inches high, supported by a gravel base of four inches. If your concrete slab is thinner than average, the ratio of water to cement needs to be adjusted in order to get a proper denseness to your slab.

Considering Joints

If your set of concrete slabs are larger than average, consider installing concrete joints as they will support the concrete patio slab. They must be a quarter of the depth of your slab, so that a 4-inch patio slab will have a 1-inch concrete joint. The appropriate size of the joints must be taken into consideration when working out the proper thickness of the slab.