Drainage Around Concrete Slab

Collapsed drain pipes under a concrete slab aren t the end of the world.

Drainage around concrete slab.

Then fill the bottom of the. Dig a trench around the perimeter of the foundation. The surface of a concrete slab is impervious to water which means that if water can t run off the surface it will pool on your patio. Make the lines 4 inches wider than the trench will be.

Diy drainage of surface water around a patio subscribe for weekly. If your landscape prevents you from pitching the patio to allow for natural water runoff your concrete contractor can install an in slab drainage system with gravel filled channels to carry the water away. Several systems are available including delta ms from cosella dorken and platon from armtec. The trench will need to be dug down to the footers of the foundation and be about 4 wide.

You will also need to dig a trench away from the foundation to either a percolation trench dry well or to daylight if the slope of the land allows. Mark the location of the drainage trench onto the concrete with spray paint. A minimum of 6 inches of drop for the 10 feet adjacent to the building is necessary. The soil however always must slope away from the foundation to ensure proper drainage.

As distressing as this news might initially be however it s no longer the end of the world thanks to advances in composite resin technology which occurred as we waved goodbye to the 20th century. The best way to prevent patio drainage problems is to plan for them when the slab is installed. Houses that are built on slabs have a concrete beam around the. To install a french drain the first step is to dig a 6 inch wide by 18 to 24 inch deep trench around the perimeter of the slab.

Ideally your property should be designed to properly handle the volume of rainfall it receives whether it s a storm with heavy rain or maybe just a particularly wet time of year. Line the trench with heavy plastic.