Forget Gravel—Here’s Why I Use Crusher Fines to Fill My Garden Paths

Crusher fines amount to the leftover small pieces of rock and gravel left after rock-crushing operations. Ranging in size from about ⅜ inch in diameter to a tiny dust particle, the small rock debris can lock together by angles more easily than larger gravel rocks, and the tiny dust particles fill in the gaps. This creates a firm and stable surface. If you’ve ever trekked across river rocks or even a gravel path, you know that they are not entirely level when you step on them.

We’ve replaced gravel with crusher fines in one landscape and used it as the basis for new paths in a backyard makeover. Although all hardscaping materials have their drawbacks, I find that crusher fines paths offer mostly benefits, including color options similar to gravel and other landscaping materials and a natural but stable way to walk around a home and garden.

Why I Like Crusher Fines Paths

In short, I think paths filled with crusher fines are attractive and practical, which is perfect when strolling through a garden. Popular as a trail surface throughout the U.S., the natural material is durable enough to cover mountain bike trails, but more water permeable than hardscapes like asphalt or concrete. Around my properties, I prefer crusher fines for the following reasons:

• As costs go, crusher fines is less expensive than pavers or concrete and comparable to gravel.
• Installing a crusher fines path is an easy DIY job.
• When installed at the right depth, crusher fines compacts enough to suppress weeds better than gravel can (because pockets between the larger rocks let in seeds and dust).
• Crusher fines allows air and water to pass through, avoiding water runoff and waste.
• The small particles in crusher fines are easy to manipulate into corners or against rock borders for a tight and neat appearance.
• It is easy to spread and level crusher fines particles.
• Crusher fines paths are as natural as gravel and offer a range of color options similar to other types of landscaping rocks.

Drawbacks of Crusher Fines

We live in a relatively hot and dry climate, so a natural material that lets water pass through is especially attractive. But one criticism of crusher fines is that it can shift and even wash away. For that reason, the light particles are not the best option for steep paths and might erode in areas that experience heavy rain and runoff. In most landscapes and situations, however, this is overcome by proper leveling and compacting at installation.

Along the same lines, some people find crusher fines paths messy. It is true that some tiny particles can get into the treads of shoes or get kicked aside. Again, proper installation, edging, and maintenance can negate most of this disadvantage of using crusher fines for pathways. 

Ways We’ve Used Crusher Fines for Walking Paths

A home we purchased had a large ornamental garden with curved gravel paths. For the first few summers there, I spent way too much of my outdoor time pulling weeds from the path; and the more weeds I pulled, the more openings I created in the landscape fabric beneath the gravel layer. When we began removing the gravel (we gave some away and used the remainder in xeric beds), we could see why the weeds had taken over. The fabric beneath was torn and covered by dirt that had worked its way down between the gravel, creating a growing medium for the weed seeds and roots and also worked through over the years.

We knew we had to replace the fabric, and that crusher fines would hold weed growth for much longer if we did it right. Later, when designing new walking paths after a backyard makeover, we planned to use crusher fines. It made tidy but natural pathways and even added some color until new plants filled in.

How We Installed Our Crusher Fines Paths

We first had to calculate the approximate cubic feet of our paths. This is easy for angular runs, but a little more complex for curves. The cubic formula (here’s an example) also includes depth, which we converted from inches to feet (6 inches equals 0.5 feet). Then we converted cubic feet to cubic yards, which is the amount that matters to the gravel retailer. We also calculated the number of bulk landscape fabric rolls needed based on estimated length (and a width that was slightly wider than the path).

After removing all of the gravel except enough to maintain a thin base, and all of the old fabric, we leveled the sections of path as best we could. We then addressed the border, either lining the path with metal edging that locks together or with rocks and pavers. Where we had existing rock borders, we turned up the rocks to get the edge of fabric under them, and then replaced the rocks before adding the crusher fines. 

We used a wheelbarrow to cart each load of crusher fines to the section and dumped a pile, spreading it carefully and as level as possible with the flat edge of a steel bow rake. We tamped the paths using a handheld steel tamper, the bow rake, and our feet. We then wet the path with a sprayer on the hose and tamped again to level and compact the material.

Tips for Installing Crusher Fines Paths

This is a simple DIY project, though it involves lots of shoveling, raking, bending, and tamping, along with some math skills. It can be tempting to cut some costs and effort by creating a thin path, but it takes a minimum of about 3 inches after compaction (4 to 6 inches before) to fully suppress weeds. Also try to keep your compacted path no deeper than 4 inches for best stability. Handy tools include a wheelbarrow, bow rake, rubber mallet for edges, and a tamper.

• Estimating the cubic yards needed for a curved path can be tricky; I would recommend underestimating a bit if you can take a pickup back to a nearby gravel yard and buy the small amount needed to finish. If you have to pay for delivery, slight (about 10 to 15 percent) overestimation might work best.
• For weed control and path durability, leave as few seams and openings in fabric as possible, overlapping edges and using staples to hold fabric in place. Also cut and overlap fabric along curves; if it buckles or folds, it can work up through your rock layer.
• Some sort of edging or border will contain loose particles in your path. It is easier to turn up all border rocks or pavers when laying fabric, returning them to their spot before adding crusher fines. 
• If using metal edging, install it first and fit landscape fabric as tightly as possible inside. Try to sink the edging to a depth just above the planned crusher fines depth.
• Dump a pile of crusher fines directly on fabric seams and pull or push it gently a few inches above ground level. This helps spread the rock in each direction without upending a seam and forcing crusher fines under it.
• When opting to DIY a crusher fines walkway, consider whether there is a path for a wheelbarrow; we hauled crusher fines up steps for some paths in 5-gallon buckets, which is slower but a good workout.
• We worked backwards, starting at the farthest end first so we did not have to run the wheelbarrow over sections already installed. You can tamp lightly as you add depth.
• If tamping by hand is too daunting or you have a large path, rent a plate compactor or walk-behind roller from a home improvement store.
• You also can ask if the crusher fines product includes clay binding material if you want high compaction, especially if you have a gentle slope (no more than a 5 percent grade).
• If you have a spot to store extra crusher fines, keep on a small pile for filling any missed, settled, or uneven spots after some path use and a good rain.

Maintaining Crusher Fines Paths

I find there is very little maintenance required for crusher fines paths, especially if installed correctly. As an inorganic mulch, it does not break down and require regular replacement. We have one area below backyard steps that is sloped enough for some particles to wash down, but they sweep or tamp back easily, and it is not enough erosion to lose substantial material. The freeze-thaw cycle can loosen crusher fines paths in winter, but you can tamp those areas again or wait to see if spring foot traffic does the trick. 

Otherwise, have small amounts on hand if possible to fill low spots as necessary. Remove excessive debris like leaves to help maintain an attractive crusher fines path.

 

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