Grading and drainage refer to shaping the ground and managing water flow so that rain and runoff move away from concrete rather than pooling beside it or soaking into the soil beneath it.
In depth
Because water erosion under a slab is the leading cause of settlement, controlling where water goes is the single most important way to keep concrete stable. Proper grading slopes the soil away from slabs and foundations, and drainage features like downspout extensions carry roof water clear of the concrete. Poor grading does the opposite, channeling water toward the slab where it washes out support.
Grading and drainage are the prevention side of concrete care. Even a perfect raising job will not last if water is still being directed under the slab, which is why Acme treats water management as part of a durable repair.
How Acme applies it. Acme advises redirecting water away from concrete using downspouts and ensuring proper grading of the slab edges to prevent water from washing away the subbase, which is essential to preventing concrete from sinking after it is raised.
Related terms: Soil Washout, Joint Sealing, Expansion Joint, Concrete Settlement
Frequently asked questions
How does grading affect concrete?
Grading controls where water goes. Sloping soil away from a slab keeps water from pooling and washing out the supporting soil, while poor grading directs water under the concrete and causes settlement.
What drainage steps protect a leveling repair?
Redirect downspouts away from the slab, ensure the ground slopes away from the concrete, and seal joints, so water cannot re-erode the stabilized base.