Drainage Under Concrete Slab

Garage s floor is concrete slab 3 4 thick at least it s best i could figure.

Drainage under concrete slab.

I suspect that the base under the slab is in poor condition. The best way to prevent patio drainage problems is to plan for them when the slab is installed. Allows for water drainage. All pipes need to be extensively tested for drainage and air pressure in supply lines multiple times during the rough in process prior to the slab being poured.

Building a dry well underground or a reservoir on the surface gives excess water a home. This article explains how to dig and run pipe under an obstacle such as a driveway or sidewalk. Collapsed drain pipes under a concrete slab aren t the end of the world. 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.

Neave knows how to drain water away from your house. Some bright minds presumably about 50 years ago terminated drain holes inside the garage. The most efficient and cost effective way to bore under an obstacle is to create a hole using the power of water. But the problems may not end there.

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. It may bend down like a frown at free edges or at joints putting the top in tension. So now i have water along garage sides year round. Dry wells reservoirs.

Once the concrete is in place the. Also a bit of water sips through some cracks in the slab. 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. 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.

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. This water can pool underneath your slab unless some form of drainage is provided. So if your entire concrete slab isn t being supported from below by the soil support system it s going to bend more easily. Concrete is porous and will therefore absorb water after a heavy rain.

When surface water has no place to go it pools and floods. Should this happen your slab can actually erode a bit over time. 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.