Waterproof Your Home with Exterior Waterproofing.

Exterior Waterproofing is a umbrella term that encompasses several types of services based on your needs. This is an excellent choice for customers that have a finished basement that would prefer it not be disturbed and like the idea of keeping the mess of construction outside.

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What We Offer

Exterior Drainage: The two most common types of exterior drainage are Exterior Drain Tile and French Drains. Exterior Drain Tile is installed along the perimeter of the home to guide water away from the foundation. French Drains are used in other areas to give pooling water a route away from the property. This is a popular option for those who experience issues such as a flooded backyard during heavy rain.

Exterior Sealing

Another effective exterior solution is Exterior Sealing. This is performed using drain tile, plastic, and tar to form a barrier to keep water from entering the basement and giving any water that collects at this barrier a route to escape. We are able to perform this repair with homes that are on a cement slab, commonly called Slab and Grade, so don’t hesitate to call BWM for your foundation as well. Our knowledgeable inspectors will be able to suggest the proper solution for your home and budget.

What Our Customers Say

I had Will come out and he was really thorough and let me know what to expect and how much it would cost. So on his service 5 but I have not had the service performed yet.
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Connor Avatar
Connor
9/05/2026
Great crew to come get things started here at 5 pm on a Friday before a holiday weekend!!
Excited to get this right!
Thanks fellas!
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Kirk Schinzel Avatar
Kirk Schinzel
9/04/2026
William Horton was very detailed and took the time to answer all my questions.
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Gabriela Bourgeau Avatar
Gabriela Bourgeau
8/27/2026

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FAQs: What Metro Detroit Homeowners Should Know About Exterior Basement Waterproofing

What is exterior basement waterproofing and excavation?

Exterior waterproofing is an umbrella term for protective drainage and barrier solutions installed along the outside of your foundation. It stops groundwater and surface runoff before moisture penetrates foundation walls, making it an ideal choice for homeowners with finished basements who want to keep all construction and excavation work outside the home.

In Metro Detroit, full exterior excavation and waterproofing typically ranges from $8,000 to $20,000+, depending on the depth of the foundation, linear footage, soil excavation requirements, and accessibility around landscaping or concrete patios. Targeted exterior drain tile installations or exterior French drain systems for yard pooling generally range from $3,500 to $9,000.

Basement Waterproofing of Michigan provides two primary exterior drainage options:

  • Exterior Drain Tile: Installed directly along the foundation perimeter to intercept groundwater and guide it safely away from the basement walls.
  • Exterior French Drains: Installed in specific areas of the yard to eliminate surface water pooling and manage backyard flooding caused by heavy Michigan rainfall.

Exterior sealing involves excavating down to the foundation footing and applying a multi-layer barrier of waterproofing tar, durable plastic membrane, and exterior drain tile. This creates a waterproof seal that blocks water penetration through the exterior masonry while providing a dedicated drainage path for collected water to escape away from the home.

Yes. In addition to full basements, Basement Waterproofing of Michigan performs exterior drainage and sealing repairs on homes built on a concrete slab (slab-on-grade). The exterior barrier and drain tile alleviate perimeter water accumulation and prevent moisture from seeping into slab foundations.