OK, so now let’s talk about interior basement waterproofing.
It’s the most common method that nearly all standard basement waterproofing companies offer.
It goes by many names - interior drainage system, french drain, drain tile, sub-floor piping system, etc. Regardless of what you call it - it has several pro’s and con’s to consider.
First of all - it’s a MUCH better option than outside excavation. The idea is that you remove a section of the floor around the perimeter of your basement - usually between 2 and 3 feet wide. Then you dig out all of the dirt and debris, until you reach the footer.
Next, you install a perforated black pipe along the perimeter, and attach it to a sump pump.
Finally, you put in drainage gravel, replace the concrete floor, and you’re done!
So sound’s perfect eh? Well, let’s look at that.
The Advantages of Interior Drainage Systems
- Much cheaper than outside excavation
- Much less disruption than outside excavation
- The guarantee is typically much better (Many offer lifetime warranties)
- The system will correct the hydrostatic pressure problems (water rising up from the bottom) that outside excavation will not correct.
Now, Let’s Look at The Disadvantages
First and foremost - it’s a system that will fail. When you put a perforated pipe down in the ground with the dirt, the water washes that dirt into the pipe. over time, they have an extremely high tendency to clog. Take a look at this picture:

Look at the end of the pipe - it’s completely filled with mud! You’re not going to get a lot of water through that pipe!
The next biggest issue is the material being used. It’s the exact same process that was done when they first built the house. The only difference is that it’s on the inside of the footer instead of the outside. Given this, you still have the same problems facing you.
Obviously, the pipe can clog. Secondly, it’s not an expensive product at all. It’s the same thing you buy at Home Depot or Lowes for about 15 cents per foot. Have you seen homes with black pipes extending off of the downspouts? Well, that’s what this material is. The only difference is that the drainage pipe is perforated… to allow water INTO the pipe.
The third most important con against this method is the installation. It’s VERY, VERY important NOT to work with a company that subcontracts the work out. Many companies will sell you a product, and then hire outside labor to install the job. These laborer’s could be doing a deck one day, then siding, then putting on a new roof, and here they come to waterproof your basement.
So what’s the big deal?
If you have someone who is inexperienced in this work, they can easily install the system improperly. The worst case scenario is that they install the piping too low, or beneath the footer. When this happens, the dirt that washes into the pipe comes from underneath of the footer. The footer is what holds your home up. If there’s nothing supporting the footer, there’s nothing supporting your home.
This can quickly lead to a structural repair job, which can cost you the big bucks!
So, everything I’ve talked about so far has a downside, doesn’t it? Next time, we’ll talk about a method that does not have these downsides - and is the proper way to correct a basement water problem.
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