Why you must read this page
In this article we provide you with real life examples of what basement leaks look like so that you can recognize what is taking place in your basement. This will go a long way towards helping you avoid being misled by unscrupulous waterproofers and unqualified contractors.
Having conducted thousands of basement / foundation inspections over the years, we have concluded that approximately 90% - 95% of the causes of a damp, wet basement are attributable to one or two of the "usual suspects" as illustrated below.
Caution: There are many ways by which water can enter your basement and/or penetrate your foundation; therefore, the waterproofing repair method chosen must address the precise cause of the basement leak. Without visual confirmation of the actual problem, or without absolute confirmation of the source of the leak using diagnostic equipment, many homeowners pay for basement waterproofing work far in excess of what is actually required, including waterproofing work performed in the wrong location, or basement leak repairs that are not needed because the source of the basement leak is not attributable to a problem with the foundation at all.
Be sure to check out our page dealing with basement dampness. Simply click here.
Be sure to read our companion article on how to recognize basement leaks.
By examining the images below it will become abundantly clear that basement leaks are relatively easy to identify when a foundation wall is exposed. Note: If a waterproofing contractor does not show you undeniable evidence of the source of your basement leak, there is a real risk that you will waste your money and/or not address the true cause of the water in your basement.
Overview of typical sources of basement leaks
Basement Leaks Often Result in Visible Mold on Walls
Basement leaks typically leave stains on the foundation walls. When a basement is finished, many basement leaks remain hidden; however, mold on drywall, baseboard discoloration and wet carpets are often the first sign that there is a leak in the basement. Here are some pictures of undeniable mould growth in a finished basement:
Here is what you can expect to see when the bare foundation walls are exposed:
Cracks in Poured Concrete Foundations
Leaking Tie-rod Holes in Poured Concrete Foundations
Corroded Snap Rods in Poured Concrete Foundations
Penetrations through the foundation to accommodate a conduit to the electrical panel and/or air conditioning and gas lines
Honeycombing in Poured Concrete Foundations
Water Leaking From The Top of The Basement Wall
Learn more about building envelope water leaks and what you can do to avoid them.
Water Leaking From an I-beam Pocket
Water Leaking From The Top of Cold Cellar Walls
Water Entering The Basement Below The Window Frame, or Through The Window
Concrete Block / Cinder Block Foundation Leaks
If you are unfamiliar with leaks in concrete block foundations we encourage you to read our blog article on the fundamentals of block foundation leaks and repairs.
Condensation Dripping Down The Foundation Wall From Behind The Insulation
This is typically seen in homes which are less than 5 years old or when there is warm and moist air in the basement which comes into contact with the cold foundation walls behind the insulation.