How to Cure a Structural Concrete Home Foundation

Keep concrete moist to cure it effectively. Concrete gains strength as it solidifies in a process called hydration, in which the Portland cement, that is the "glue," reacts with water. Dry concrete too fast and it will develop fine surface cracks, which eventually can flake off or spread to weaken the concrete. Take at least 5 to 7 days to cure any concrete foundation; very thick concrete may require much longer.

Moisten the concrete with water, the most basic method of curing. Spray the surface with a mister or fogger to keep the concrete slightly damp. Don't let the surface dry between water applications. Freshly-poured concrete will develop water bubbles, called "bleed water," but don't use these for curing; pull them off the surface and use fresh water for curing. Spray as often as needed to keep the surface damp.

Cover the concrete with protective material to prevent evaporation of the water in the concrete. Use burlap, plastic sheeting, canvas, special curing blankets of fabric covered with plastic or even straw. Apply plastic as soon as the concrete surface is solid enough to resist damage. Burlaps or other fabric and straw must be moistened periodically. Check the concrete under the covering regularly to be sure it retains moisture. This step is especially important in hot and dry conditions..

Use a chemical membrane, typically sprayed on the surface, to keep water in the concrete. Apply these soon after concrete is poured and is setting. Follow directions carefully; some chemicals may retard hydration or affect waterproofing of exterior surfaces in basement walls. Select chemicals which will not affect flooring material on slabs or will not crack and peel off exterior surfaces.