Drainage Under Concrete Slab

Building a dry well underground or a reservoir on the surface gives excess water a home.

Drainage under concrete slab.

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. A concrete slab may bend concave up like a smile if the subgrade has a soft spot in the middle putting the bottom in tension. Trenchless drain repair under your slab costs about a 150 per linear foot and takes about two days to do as opposed to two weeks for excavation for drain repair under the slab. Allows for water drainage.

Once the concrete is in place the. When surface water has no place to go it pools and floods. Many drainage issues stem from improper grading techniques during a home or building s construction. Collapsed drain pipes under a concrete slab aren t the end of the world.

Typically if you were to excavate your floors to do the drain repair under your slab you should expect to pay about 450 per linear foot. But the problems may not end there. It may bend down like a frown at free edges or at joints putting the top in tension. Some bright minds presumably about 50 years ago terminated drain holes inside the garage.

This article explains how to dig and run pipe under an obstacle such as a driveway or sidewalk. The best way to prevent patio drainage problems is to plan for them when the slab is installed. This water can pool underneath your slab unless some form of drainage is provided. I suspect that the base under the slab is in poor condition.

Should this happen your slab can actually erode a bit over time. Problems such as improper slope or no slope at all can begin with the pouring of the concrete. The most efficient and cost effective way to bore under an obstacle is to create a hole using the power of water. Also a bit of water sips through some cracks in the slab.

So now i have water along garage sides year round. Dry wells reservoirs. Garage s floor is concrete slab 3 4 thick at least it s best i could figure. Concrete is porous and will therefore absorb water after a heavy rain.

Adding crushed stone under concrete is an excellent way to allow water to drain because it can. So if your entire concrete slab isn t being supported from below by the soil support system it s going to bend more easily. It is not uncommon to see improper or inadequate drainage such as drain pipes that are too small for the amount of water they must move drain pipes that flow uphill or do not have enough drop to move water fast enough.