A waterproofing membrane can address one specific crack or seal an entire foundation wall, and the warranty changes with the scope. At KC Pier, a crack membrane runs $1,000 to $2,000 with a 10-year warranty, and a full exterior membrane, typically installed with a drainage system, carries a lifetime warranty. The lifespan of a waterproofing membrane depends on how it is applied, how well the wall is prepped, and how water is managed afterward.
Two Ways We Apply a Waterproofing Membrane
At KC Pier, a waterproofing membrane on the outside of the house comes in two forms. We can address a single crack, or we can waterproof the full exterior of the home.
Targeted Membranes for Specific Cracks
The first option is a smaller piece of membrane adhered to the outside of the house to address a specific crack. This type of repair comes up all the time.
Our process:
- We apply the membrane over the crack.
- We extend it 18 inches on both sides of the crack.
- We seal it to the wall and allow it to perform as a waterproofing barrier.
Full Exterior Membranes During Excavation
More commonly, we install membranes when we excavate the outside of the home for a full exterior waterproofing job. At that point, the wall is exposed all the way down to the footing, typically with an 8- to 10-foot dig.
We clean the wall off bit by bit until you can see the original exterior wall of the home. Then we apply the membrane on the full exterior. Depending on the home, that can mean 20, 30, 40, and sometimes 50 or 60 feet of wall that is completely waterproofed.
| Crack Membrane | Full Exterior Membrane | |
| Coverage | One crack, plus 18 inches on each side | The full exterior wall, 20 to 60 feet |
| Dig depth | Typically 3 to 8 feet | Typically 8 to 10 feet, down to the footing |
| Warranty | 10 years | Lifetime (full system typically includes drainage and a sump pump) |
Key Takeaway: A crack membrane covers one specific crack. A full exterior membrane covers the entire wall from the footing up.
Crack Membrane Cost and Warranty
What Drives the Cost
A crack membrane typically runs $1,000 to $2,000. The price varies based on:
- The size of the membrane
- The depth of the dig, which can be 3 feet on some homes and 8 feet on others
Why We Back It for 10 Years
At KC Pier, we completely clean the wall and brush it off before the membrane goes on. That prep ensures the membrane lasts for the full warranty, and it is why we can offer a 10-year warranty.
The warranty sets the guaranteed term. How long the membrane keeps working after that depends on the conditions around it. Once the membrane is adhered to the wall, very little in the environment is likely to move it. As long as the area is not exposed to a large amount of water or large movements from Mother Nature, the membrane will continue to perform. We rarely have to go back and take a look at membranes once they are installed.
Pro Tip: When you get a quote for a crack membrane, ask how deep the dig will need to be. Along with membrane size, dig depth is what moves the price within the $1,000 to $2,000 range.
Need expert help with foundation waterproofing? Contact KC Pier for a free consultation.
Waterproofing Membrane Lifespan vs Builder Spray Coatings
New homes often get a different kind of waterproofing than what we install, and the warranty gap is wide.
Spray Coatings in New Construction
In new construction, when the foundation wall is exposed, many commercial and residential builders use a spray for their waterproofing. That spray typically comes with only a one-, two-, or three-year warranty from the installer.
Our Lifetime Exterior Membrane
When we expose the wall and place our membrane as part of a full exterior waterproofing system, it is a lifetime product. It is apples and oranges compared to a builder spray. When it comes to our exterior waterproofing, you get what you pay for.
Why Water Control Matters for a Lifetime Warranty
Exterior waterproofing will usually force the water that reaches the exterior wall down to the bottom of the footing. That means you need some type of water control.
Drainage Systems and Sump Pumps
Our full exterior waterproofing usually includes a drainage system that leads to a sump pump. From that sump pump, we direct the water completely away from the house.
How Drainage Protects the Lifespan of a Waterproofing Membrane
With this setup, you get two benefits:
- Exterior waterproofing so you know water is not going to get inside.
- A water management system that relieves the water pressure on the outside of the wall, collects that water, and gets it away from the house.
That is why we at KC Pier can offer a lifetime warranty on full exterior waterproofing. It will last well beyond your years in the home and likely through the next owner’s time there too.
Key Takeaway: The membrane keeps water out, and the drainage system and sump pump relieve the pressure on the wall. Together, they are why we back full exterior waterproofing with a lifetime warranty.
Protect Your Foundation with KC Pier
A crack membrane addresses a specific crack for $1,000 to $2,000 and comes with a 10-year warranty. A full exterior membrane, typically installed with a drainage system and sump pump, carries a lifetime warranty. If you own a home in Kansas City, contact KC Pier for a free consultation. Our team will recommend the option that gives your home the longest waterproofing membrane lifespan.
