Basement Waterproofing in Grosse Pointe, MI | Mansour's
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Serving the City from the Village to Neff

Waterproofing, Plumbing & Excavation Experts in Grosse Pointe

The City of Grosse Pointe is about a square mile of older homes around the Village on Kercheval, and nearly all of it drains to the Neff Road pump station on a combined sewer. When that station falls behind, basements from Cadieux to Lakeland feel it, which is why the city voters approved a sewer separation bond in 2024.

25-Year Warranty
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The Village Neff Park area Cadieux Road Lakeland Maumee Rivard Kercheval corridor

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The City of Grosse Pointe runs on one pump station

People call it “the City” so it doesn’t get mixed up with the other four, and it’s the smallest of the bunch by area. The Village shops on Kercheval sit in the middle. Around them are blocks of 1910s through 1930s houses on narrow lots, with Neff Park on the water and Cadieux running up toward Mack.

Almost all of it drains through a combined sewer to the Neff Road pump station. That one fact explains most of the basement calls we get from City addresses.

2016 showed how thin the margin is

On August 16, 2016, storm sewer pumps serving the City shut down in the middle of a heavy rain. About 200 homes backed up. The city’s own study said the pump failure and the rain together did it, and called it an extremely rare event. Then June 2021 came along and the whole east side found out that rare isn’t the same as never.

The city’s answer is a stormwater separation project to pull rain out of the combined pipes and take pressure off the Neff Road station. Voters approved a 21-year bond for it in August 2024, with close to 84 percent saying yes, and FEMA put money toward the first phase. Federal funding has been shaky since, so the timeline isn’t settled.

We think the project is the right call. We also think nobody should leave their basement exposed while it gets built.

What we’d do on a City house

Start with the sewer line. A camera inspection of the lateral tells us if the old clay pipe is cracked, offset or full of roots. If it’s sound, a backwater valve goes in on the main line so street-side sewage can’t come up your floor drain. If the lateral is bad, we repair it first.

Then the walls. Pre-war City foundations are mostly brick, stone and clay tile. They seep slowly along the mortar instead of leaking at one crack, and they’re usually worst low on the wall, right above the footing, where the original clay drain tile outside has long since filled with silt. An interior drain along the footing to a sump catches that water no matter where it comes through. Add a battery backup, because the same storm that overloads Neff Road tends to knock power out on your block.

One more thing on City houses. Plenty of them still have downspouts that run into the ground at the corner of the house and feed the old footing tile or the sewer. During a storm that’s roof water headed straight for the same overloaded pipe. Cutting those off and carrying the water out into the yard is cheap, quick, and one of the few things that helps both you and the whole street.

Small lots, tight work

Most City side yards are a driveway on one side and a strip of grass on the other, with the neighbor’s house right there. That shapes everything. Interior work is usually the practical choice. When we do dig outside, on a corner lot or a wider parcel near the lake, it’s with small equipment and a conversation with the neighbor first.

Not every wet basement needs us

If water shows up only after you’ve watered the garden, or only at the corner where the downspout empties onto the driveway, start there. Extend the downspout. Check that the ground slopes away from the house. Plenty of City homeowners have fixed a damp corner with a weekend and a bag of topsoil. We’d rather tell you that than sell you a system you don’t need.

Complete Home Services in Grosse Pointe

From basement waterproofing and excavation to drain cleaning and sewer repair, we offer comprehensive services to protect your Grosse Pointe home.

Interior Waterproofing

Complete interior drainage systems with French drains, vapor barriers, and waterproof coatings.

Exterior Waterproofing

Foundation excavation and waterproof membrane installation to stop water at the source.

Sump Pump Systems

Primary and water backup sump pump installation, repair, and maintenance services.

Hydrojet Drain Cleaning

High-pressure hydro jetting and professional drain cleaning for stubborn clogs.

Sewer Backflow Preventers

Protect your home from sewage backup with professional backflow preventer installation.

Plumbing Services

Full-service residential plumbing including repairs, installations, and emergency service.

Foundation Crack Injection

Polyurethane and epoxy injection to permanently seal foundation cracks and stop leaks.

Sewer Repair & Replacement

Complete sewer line diagnosis, repair, and replacement services with minimal disruption.

Sewer Video Inspection

HD camera inspections to diagnose sewer and drain problems accurately before repair.

Excavation Services

Professional excavation for foundation repair, sewer access, and drainage solutions.

Exterior Drainage

French drains, dry wells, downspout extensions, and yard grading solutions.

Electric Eel / Snaking

Powerful mechanical snaking to clear tough clogs in drains, toilets, and main lines.

Sewage Ejector Pumps

Installation and repair of ejector pumps for basement bathrooms and laundry rooms.

Flood Restoration

24/7 emergency flood response with water extraction, drying, and restoration services.

Thermal Imaging

Infrared technology to detect hidden water leaks and moisture without destruction.

Your Trusted Local Home Service Experts

On City streets the lots are tight and the houses are close, so we plan around driveways and shared side yards before anyone picks up a shovel. We come down from Shelby Township for every job, and the backing below goes with each one.

25-Year Transferable Warranty

Our industry-leading warranty protects your investment and transfers to future homeowners.

24/7 Emergency Response

Water damage doesn’t wait – neither do we. Call anytime for immediate assistance.

Licensed & Fully Insured

Complete peace of mind with fully licensed, bonded, and insured professionals.

Flexible Financing Available

Make home protection affordable with easy payment plans and financing options.

Professional excavation in Grosse Pointe
Interior waterproofing
Sump pump installation
1,600+
Projects Completed

What Grosse Pointe Homeowners Say

Don’t just take our word for it – hear from our satisfied customers.

“"Our Grosse Pointe home had a foundation crack that leaked every time it rained hard. Mansour's performed crack injection carefully and explained the warranty. Three years later it's still holding up perfectly—dry basement."”

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Elizabeth M.
Grosse Pointe, MI

“"Our Grosse Pointe basement had water coming in every spring. Mansour's installed interior drain tile and a sump pump. Dry for over two years now."”

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Richard K.
Grosse Pointe, MI

“"The historic foundation in our Grosse Pointe home needed expert care. Mansour's understood older construction and waterproofed it properly. No more water issues."”

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Margaret S.
Grosse Pointe, MI

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State of Michigan
20+ Years Experience
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Grosse Pointe Services FAQ

Get answers to the most common questions Grosse Pointe homeowners ask about our waterproofing, plumbing, and excavation services.

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A city study afterward found that storm sewer pumps shut down during the August 16, 2016 downpour, and that failure plus the rain flooded about 200 Grosse Pointe homes. Engineers called it extremely rare. Rare or not, it showed how much City basements depend on one pump station working perfectly. A backwater valve in your own line is how you stop depending on it.
It should help a lot. The city's plan separates storm water out of the combined system so less flow reaches the Neff Road pump station, and residents backed it with a 21-year sewer bond in August 2024. It doesn't touch the lateral from your house to the street or the walls of your basement. Those are still yours.
In the City, if the house went up before about 1940, the walls are most likely brick, stone or clay tile, often painted many times over. We can usually tell in a minute by tapping, looking at the joint pattern, or checking an unpainted spot behind the furnace. It matters because each kind leaks in its own way and gets a different fix.
Maybe not. On City lots, a single wet corner often lines up with a downspout, a driveway that slopes toward the house, or a cracked section of old drain tile right there. We'd check all three before quoting a full perimeter system. If a partial drain run to a sump handles it, that's what we'll recommend.
Carefully. Many City houses have a driveway on one side and three or four feet of grass on the other. For interior jobs that's no problem, since everything goes through a basement door or window. For digging, we use small equipment or hand tools and we talk to the neighbor before we start if we'll be close to the property line.
Yes. Sewer backups don't wait for business hours, and we take emergency calls around the clock. The drive down from Shelby Township usually runs about 40 minutes. In the meantime, stop running water in the house so you aren't adding to what's coming up the drain.
Do the water work first, while the walls are open. That means a camera check of the sewer line, a backwater valve, and a look at the walls for seepage after a good rain. If there's any doubt, interior drain tile and a sump with a backup pump go in now, because pulling out new drywall later costs far more than doing it in order.
For a typical City basement, an interior drain system takes two to four days, and the new concrete strip along the wall is walkable within a day or two after that. A backwater valve on its own is usually a one-day job.
Our basement waterproofing systems carry a 25-year warranty on materials and labor, and it transfers to the next owner if you sell. It covers the system we install, not the contents of the basement, so a sewer backup rider on your homeowner's policy is still worth a call to your agent. We're licensed and insured, and financing is available through Enhancify.

Serving Grosse Pointe & Surrounding Areas

In addition to Grosse Pointe, we provide waterproofing and plumbing services throughout Southeast Michigan.

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