How to maintain concrete

Decorative concrete is a popular choice for construction projects due to its durability and low-maintenance properties. However, even with its robust nature, it's important to properly care for and maintain your concrete surfaces to ensure they look beautiful and remain functional for years to come. Neglecting concrete can lead to the buildup of algae and moss, making the surface slippery, and can also result in damage over time.

To prevent damage to concrete, it's important to take precautions against exposing it to heavy machinery and vehicles. Shoveling or plowing concrete surfaces, especially during the winter months, should be done with care to prevent harm from metal tools. Cleaning concrete is relatively straightforward and requires minimal effort. It's important to remember that debris is more likely to accumulate at certain times of the year, such as the fall when leaves are dropping.

Algae and moss buildup can be prevented by ensuring that your concrete surfaces receive adequate sunlight. Trimming back trees or other plants that shade your patio or driveway can help with this. Resealing your concrete periodically is another effective way to maintain its clean, safe, and attractive appearance. Pressure washing by a professional is the best method to remove built-up debris and keep your concrete surfaces looking new.

Sealing and resealing your concrete is not required, but it can go a long way in preserving its appearance and durability and preventing damage. Resealing also makes cleaning easier and more efficient. See our concrete sealing and finishing service for what we recommend for Seattle conditions. In the event of stains, remove them as quickly as possible — alkaline degreasers or detergents work well on oil and grease.

When it comes to hazardous chemicals, avoid exposing your concrete to deicers containing ammonium nitrate or ammonium sulfate, which damage the surface by triggering moisture and refreeze cycles. Other deicer chemicals — calcium chloride, sodium chloride (rock salt), magnesium chloride, magnesium acetate, magnesium nitrate — all harm concrete to varying degrees. Freshly poured concrete is most susceptible during its first year of cure, so avoid all of these chemicals on a new slab. Sand is a safer alternative to salt for traction.

When maintenance alone is no longer enough — cracks have widened, surfaces are spalling, or slabs have settled — concrete repair or leveling can restore the surface without a full replacement. For broader maintenance routines that account for Seattle’s climate, see the concrete spring cleaning guide and moss and mildew removal.