Slag – An Economical Alternative to Asphalt and Gravel


Last Updated on July 15, 2024

It may not be a pretty name but along with our customer’s demands, we have discovered many uses for slag. Our customers benefit by using slag as a cost-effective alternative to asphalt or crushed rock and gravel. Slag is commonly used for driveways, parking lots, landscaping, walkways, and industrial storage yards. When asphalt may not fit your budget, slag may be just the option for you or your business.

Slag cuts the dust and mud out. If you have a muddy driveway, covering it with slag can take care of the problem. If you have a private drive, it will cut out the dust caused by traffic. Engineers estimate that 1 vehicle stirs up 4 1/2 lbs. of dust into the air when traveling at 30 mph for every mile on an unpaved road.

Slag is really heavy. In fact about 50% more heavy than traditional gravel that is used for ground cover. This is important because the unit weight helps the product stay in place. The high angularity and sharp edges help the material to interlock. This also helps the material stay in place. Other benefits this provides are better traction and greater skid resistance.

Slag is harder and internally bound. Because of the extreme temperatures during the production process, slag is extremely hard. It has a Mohs hardness rating of 6 versus granite which only reaches a rating of 4. This provides extreme durability, sustainability, and a greater load-bearing capacity.

What is Slag?

Slag is a by-product of steelmaking. It is made by the separation of the molten steel from impurities while the steel is melted in a large furnace. After the slag is collected from the separation process it is then cooled using different processes depending on the final size of the product. It then goes through a curing stage before the product is ready for use.

Is Slag Safe?

Yes, slag is very safe. Its primary use is construction but other bi-product uses of slag include fertilizer in gardens and farms. This is because of the slowly released phosphate content and its liming effect. Because the use of slag helps steelmakers reduce their impact on the environment, slag qualifies as a Green Product which also means it is good for the environment and conserves natural resources.


There are many uses that have taken advantage of this amazing product as you can see in the following list.

  • Unpaved Driveways and Roadways – A perfect alternative when asphalt does not meet your budget.
  • Durable Asphalt Mix – Because of its durability and its anti-skid properties, it is used by Utah’s Counties and Cities.
  • Railroads – Slag has been a key factor in railways.  It supports extremely heavy loads, drainage, and great track stability.
  • Landscape Material – Used both in the commercial and residential markets as an affordable solution to gravel and crushed rock.
  • Landfill Cover – Waste management companies use slag to control dust, moisture, and odor.
  • Silage Pads and Barns – Because slag is completely safe for use around animals, it is a great product for the farming community and ranches.

With so many uses you can see that slag really is a quality product. We are extremely happy to be able to provide a low-cost, environmentally friendly solution to our customers.

Call Top Job Asphalt today to see how we might be able to use this product in your next project or click here for a free estimate.

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Mike Phillips
Mike Phillips
January 17, 2023.
Great company to work with. We contacted Top Job to repair a county road that we dug across for an irrigation line. They were very professional yet friendly. Our job was completed quickly. We recommend this company.
Sam Rowley
Sam Rowley
December 8, 2022.
I’m not sure how the service actually is, but some old guy in a Top Job Toyota was riding my butt today and flipped me off, or it was maybe an aggressive wave at the red light near the Logan library. Hope his day gets better. 12/8 at 230
Kim Rappleye
Kim Rappleye
December 7, 2022.
Very professional and personalized service. Highly recommended!
Mark Malmstrom
Mark Malmstrom
November 22, 2022.
They were easy to get a hold of and showed up when they were scheduled. Good communication and good work.
David Bunnell
David Bunnell
November 4, 2022.
I appreciated the pleasant attitude when talking w/the estimator as well as the scheduler. The work crew did a great job! I highly recommend Top Job Asphalt!
Steven Jacobsen
Steven Jacobsen
October 30, 2022.
Top job Asphalt did an amazing job on my project very professional, I would definitely use them again when I have the need.
Chris Salvesen
Chris Salvesen
October 28, 2022.
Did a great job on the 3" overlay for my very old and deteriorated half circle driveway. Looks brand new. All the transitions to concrete are near perfectly matched when I wasn't sure they could do it. It's almost weird now not feeling the bump driving out of the garage or over our bridge.
Matt Welch
Matt Welch
October 27, 2022.
Top Job paved our asphalt driveways and we couldn't be happier. The service, quality and price were the best I could find and I looked everywhere! Great job guys! I'll be calling back when I start my next project.
Todd Wardrop
Todd Wardrop
October 26, 2022.
I'm so impressed!!😀 Top Job has done such excellent work on my neighbor's driveway ... I'm so jealous. It's absolutely beautiful, and I can't believe how smooth it turned out. It's just perfect. What a great company!

What Our Customers Are Saying

Very impressed with the quality of their work and the organization of the company. The project estimator was spot on as to when the bid would be received and the work was professional  from start to finish. I appreciated the opportunity for a walkthrough inspection after the crack filling was completed as I had some very large cracks in the asphalt. I give this company a ten out of ten (which I really do) and highly recommend them.

Paul Pratt