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How thick should I spread gravel?

The ideal thickness of each layer is between 4 to 6 inches. The middle layer should also be angular stones about 2” to 3” in diameter such as our #2 Bluestone. Since the material is angular it locks together providing traction and a stable foundation.

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Date: January 18, 2017

News - Simple Steps to Laying a Gravel Driveway

A gravel driveway is the least expensive driveway when comparing to other types, and if installed properly, can last up to 3 to 5 to even 10 years with regular upkeep and maintenance.

Prepare:

Determine the area that will make up the driveway using stakes and string. Be sure to remove any grass or topsoil from the marked-off area. Level out the area that will make up the new driveway. Make life easier for your client down the road and place geotextile fabric down to prevent weed and unwanted plant growth.

Calculate:

The bottom layer should be comprised of stone (6” crushed rock) or consider 6” recycled concrete. The ideal thickness of each layer is between 4 to 6 inches. The middle layer should also be angular stones about 2” to 3” in diameter such as our #2 Bluestone. Since the material is angular it locks together providing traction and a stable foundation. The top layer should consist of gravel such as 2” washed gravel or most popular: 3/8” pea gravel also known as #8 pea gravel. To determine the amount of material needed, download our Concrete and Agg Calculator from your mobile app store or use our Sand, Gravel and Stone calculator on our website.

Compact:

Work smarter not harder. Many gravel delivery trucks can not only drop off the material but can also spread the quantity out over a particular area to make less work for you. Once the angular bottom material is delivered, compact the layer of stone with a bulldozer. When the gravel is delivered be sure to spread the material so that it peaks in the middle then tapers off at each side to allow for adequate drainage. If you happened to take a “before” picture, don’t forget to take an “after” picture as well to post and show off on your website or social media channels.

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Do you need to compact gravel under concrete?

Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab.

Concrete may seem strong, but after many years, elements, and pressure, it will eventually crack. So in order to make your concrete last as long as your money that went into it, adding a layer of crushed stone under a slab of concrete will increase the life of your investment. Here are 3 reasons why a layer of crushed stone is important to the life of your concrete:

A Level Surface

Adding crushed stone under your concrete slab will provide a level surface for your foundation. Simply pouring concrete onto the ground will expose it to elemental erosion that will cause cracking and sinking. Similarly, if there are roots or plants under your slab, they may rot and cause unevenness. Pouring concrete over crushed stone, however, will eliminate these worries.

Proper Drainage

Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab. Adding a layer of crushed stone will add proper drainage, as well as create a barrier between your slab and the ground. For added protection, consider adding a vapor barrier as well.

Settlement Cracks

Over a long enough time, concrete is prone to cracking. A flaw that can lead to unevenness. So while this is typically caused because of movement and shifting in the ground (due to poorly compacted soil, or soil type), a layer of crushed stone will greatly reduce the chances of this happening, and increase its longevity.

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