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Gravel is one of the most versatile materials you can use for landscaping, building, and road construction. Be it building a driveway, pathway, patio foundation, or even a foundation slab, compaction is the difference between a surface that will last and one that will break down in no time. Compacting the gravel foundation strengthens it, stabilizes it, and enables it to bear weight, weather, and time without moving or settling.
Uncompacted gravel forms air spaces that weaken the structure. Under long term conditions, these air spaces allow the aggregate to shift under load, causing ruts, irregular terrain, and poor drainage. Compaction minimizes voids, creates a closer and more stable surface, and increases load carrying capacity. Compacted gravel also resists erosion, frost heave, and weeds, which are pains for homeowners and contractors alike.
It is necessary to prepare the site correctly before compaction begins. The stability of the gravel layer will depend on what is below.
Remove grass, roots, topsoil, and organic materials. Organic contents deteriorate with time, occupying spaces that cause the gravel above to settle and shift. A hard, clean subgrade needs to begin with.
A gravel road must never be perfectly flat. Instead, slope the base so water will drain off. For driveways, this usually means a slight crown down the middle or slope to one side. Poor drainage leads to puddling, erosion, and broken compaction over time.
Gravel that is too dry will not settle well because dust and loose particles do not adhere to one another. On the other hand, over saturated gravel could turn soggy and unstable. The best is slightly wet gravel — water makes particles bond together and settle next to each other without sliding.
Dropping all the gravel and attempting to compact it seldom succeeds. Rather, lay down gravel in thin layers, or lifts. This makes it possible to compact evenly and completely.
Compact each lift completely before adding the next. Layering up from bottom to top makes sure the gravel on the bottom is as solid as the gravel at the top.
Most specialists recommend lifts of no more than 3 to 4 inches. Thicker lifts do not compact evenly and leave soft spots which can settle later. In larger projects where heavier load bearing is required, thinner lifts might be best.
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Overall gravel thickness is calculated based on the job and what it is being used for.
The deeper the gravel, the more layers you will need to compact to achieve a dense, stable base.
The most common choice for driveway bases. Its angular edges lock together, creating strong interlocking support while allowing proper drainage.
A blend of crushed stone and stone dust. The combination creates a tight, dense base and is most suitable for use in driveways that need to handle heavy traffic.
An affordable and eco friendly alternative. RCA is suitable for compaction because it is in high demand as a virgin stone substitute.
Are you looking to build a stone or gravel driveway and want to know how to calculate your needs? Let the experts at Landscape Barn help!
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