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How Water Can Permeate a Concrete Foundation over Time

Is water seeping through your concrete foundation?  If left untreated, water can slowly erode your foundation and lead to costly foundation repairs.  Here in Toronto, we respond to several hundred basement waterproofing calls a year.  Some repairs are minor, while others are costly repairs.  Most of the costly foundation repairs we treat could have been prevented, or at least minimized, if proper measures had been taken earlier.

One of the foundation problems we frequently come across is a slowly eroding foundation due to a prolonged period of water penetration.

Nature often has its way with buildings, no matter the constructors’ intentions. Sometimes builders don’t try hard at all. Perhaps they are running short on time or materials. Possibly, they don’t understand the theory behind what they are doing. Property owners end up with the result, long after the construction team is gone.

In this article, we examine the phenomenon of wet concrete foundations. What causes them, why they happen in some places and not in others, what to do about the problem, and so on.

The Inherent Weakness of Concrete

Concrete consists of five essential ingredients:

  • The first is stone chip that adds bulk and strength.
  • The second is the steel bars that prevent the mix from cracking.
  • The others are cement mixed with sand to form a “glue” that holds the thing together when water’s added.

Concrete is porous when it’s dry. When there’s water in the area, it sucks it up like a giant wick.

Where Does the Water Comes From?

Dig a hole that’s deep enough, and it starts to fill with water like a drinking well. That’s because there’s always water somewhere beneath the ground. The only uncertainty is the depth. It could come from rainwater that’s filtered down, from an underground stream, from a leaking water pipe, or from a leach drain.

The same gravity that prevents us from flying off the earth presses down upon the ground, compressing it. This force pressurizes the moisture just like when a child squeezes the trigger on a toy water gun. Scientists call the energy that results hydrostatic pressure. This turns ground water into a mighty powerful thing that can find a way through most materials.

Concrete is a Natural Target

We mentioned earlier that dry concrete acts like a natural wick. As the water pooled on top evaporates, it siphons up more to replace it. This is why vacuuming it away seldom helps. Sometimes the concrete cracks due to poor construction methods, ground movement, or a weak mixture of the “glue”. When this happens, groundwater comes bubbling up through a fissure.

How to Prevent This From Happening

As we said earlier, nature will have its way. If you must build in damp earth, you can try to divert the water by installing French drains, and putting down a moisture barrier before you cast the slab. This is by no means as simple a matter as it may sound. Water is a dynamic thing and incredibly persistent.

What to Do if This Fails

Over time, the water permeating through your concrete floor is going to soften and dilute the glue, eventually causing it to begin to disintegrate. There are two strategies to counter this.

  • The preferred one is to install French drains that lead the groundwater elsewhere.
  • Second prize is to try to stop the siphon process by applying a waterproofing medium on top.

More often than not, you need a combination of the two to achieve success.

If you live in Toronto and the surrounding GTA, and would like a free on-site inspection and estimate, contact us here today.  If you are outside of the GTA, feel free to send in your questions, we are happy to help!

 

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NuSite Group is a Toronto based basement waterproofing and foundation repair company that specializes in Basement Waterproofing, Basement Lowering, and Foundation Repairs. Call us today at 416-622-7000 or 905-731-1228 for a free in-home estimate and inspection.

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Interested in working with us? Check out some of our customer testimonials below and find more on Homestars. We are one of the highest rated basement waterproofing companies in Toronto

Mark Lipton - Homestars Review

Basement Waterproofing

Our basement leaked! Of course . . . we bought a 100 year old house! But my office needed to be in the basement permanently. I interviewed 10 different companies until we decided on the Steinbergs and their crew at Nu-Site! They are professional, reliable, courteous, honest, and they really make an effort to communicate with the client about every step of the process.

Sara Jack - Homestars Review

Foundation and Waterproofing Repairs

After several years of chronic leaks, we decided to have our basement waterproofed once and for all. The team over at Nusite was professional, answered my questions during the project and stayed within their quoted price....which is always a concern for me when working with contractors. Great job overall

Joshua Persaud - Yellowpages Review

Basement Waterproofing

Had several cracks in my basement wall and they would leak whenever we had a heavy rain. It started about a year and a half ago and seems to have gotten worse over the past 6 months. I tried having my neighbor seal it, but it started leaking again within a few weeks. Called several waterproofing companies and got several quotes. Finally went with Nusite contractors for the job. They gave a reasonable quote and I liked the guy that came by for the estimate. They stayed within budget and cleaned up before they left. It's been almost 3 months now and it seems to be working great.