Exposed Aggregate Concrete
Exposed Aggregate Concrete
Exposed Aggregate is able to stand up to our cold winters with the least damage of any decorative concrete finish. This is due to the top surface being washed off leaving the weaker cream present in other finishes absent and decreasing chances of spalling. Exposed Aggregate mixes are special mix designs with a higher rock content than other mixes so there is a higher surface area of rock content, which is desired in this decorative concrete finish. Aggregate colours, sizes will vary due to supply, and sources changing over time. Aggregate mixes range in size from 10mm to 14mm normally. Colour can also be added to aggregate mixes to match stucco or siding with custom colour matching available.
Installing Exposed Aggregate
The preparation for exposed aggregate concrete is typical to all concrete. However, the process diverges once the concrete is poured. Instead of finishing the surface as usual, we apply a retarder to prevent the top 3/16″ of the slab from setting. Afterward, we return to expose the aggregate by either power washing or sandblasting the surface. Power washing is typically used for slabs on grade, though it can be a messy process. We recommend transplanting any nearby flowers to avoid damage during the construction. Concrete stairs and steps are often sandblasted for a cleaner, more refined finish.
Sealing Exposed Concrete
Concrete sealing is an essential next step in your exposed aggregate concrete project. The most commonly used sealer for this finish is an acrylic high-gloss sealer with a solids content of 25 to 30 percent. The higher the solids, the thicker the sealer, which directly impacts its longevity. To improve safety, non-slip additives can be mixed into the sealer to reduce slipperiness. We apply the sealer using a roller to ensure even coverage and work it thoroughly into the aggregate surface for a smooth, durable finish.
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Exposed Pricing
The pricing for exposed aggregate projects can vary based on several factors. The size of the job plays a significant role, as larger projects typically cost less per square foot compared to smaller ones. Equipment access is another consideration, as limited access can affect the cost. The complexity of the project also influences the price—projects with intricate designs, such as multiple separately formed pieces, radius points, or thickened edges, will generally cost more than a simple, large square pad. Additionally, aggregate seeding—adding extra aggregate to the surface when it’s not feasible to use it in the entire concrete mix—can also impact pricing. A prime example is obsidian, which we have seeded into concrete. For the most accurate and tailored quote, we recommend onsite estimates to account for all these variables.
