Common questions about basement waterproofing
- How do I waterproof or seal a basement foundation wall that leaks?
- How do you build a wet area basement?
- How do you fix a wet basement?
- How do you stop moisture in a basement?
- How do you waterproof an unfinished basement floor?
- How does a French drain work properly with the holes?
- How does the sump pump installation process work?
- How effective are French drains?
- How long can a basement stay without repairs if it is wet?
- How long does a liquid waterproofing membrane typically take to dry?
- How long does a waterproofing basement last?
- How much does it cost to waterproof a basement?
Malden basement waterproofing — local context
If your Malden basement keeps taking on water, the city's own geography is working against you. Malden sits in the low-lying Mystic River basin and has its own waterway — the Malden River, a 2.3-mile tributary that was brackish and tidal until the Amelia Earhart Dam went in in 1966 (Wikipedia, "Malden River"). A USGS streamgage, "Malden River at Malden, MA" (site 01103038), tracks river levels right in the city (USGS Water Data), and as a dense, ~66,000-person city, Malden's driveways, streets and sidewalks push stormwater toward low spots instead of letting it soak in — the EPA names urban runoff as the defining problem of the lower Mystic (EPA Mystic River). In ground like this, 603 installs an interior basement waterproofing system — a full-perimeter drain, a sump pump every 120 feet, a wall vapor barrier and a dehumidifier — not exterior excavation, which Nik calls a poor 2–3-year fix. Pair it with sump pump and drainage maintenance. Basement waterproofing runs $3,000–$30,000.
What a recent customer said
Chris and his team were amazing! We had two sump pumps installed under our house (flood zone). The amount of professionalism and quality of work that they did was beyond words! They were able to get it done quickly, cleanly and made sure that we knew every step along the way! Could not recommend them enough to anyone looking for a solid team, with really fair pricing!
Frequently asked questions
Why do basements flood in Malden, MA?
Malden sits in the low-lying Mystic River basin and has its own Malden River, a 2.3-mile tributary that was tidal until the Amelia Earhart Dam was built in 1966 (Wikipedia, "Malden River"). As a dense, roughly 66,000-person city, Malden is covered in impervious surfaces — driveways, streets and sidewalks — that stop stormwater from soaking into the ground and push it toward low spots and storm drains instead. The EPA flags this uncontrolled urban runoff as a defining problem of the lower Mystic / Malden River area (EPA, Mystic River Watershed). The result is high groundwater and water pressure against basement walls and floors.
Is my Malden home in a flood zone?
Properties near the Malden River can fall within FEMA-mapped Special Flood Hazard Areas. Zone AE is the most common flood zone in Massachusetts; it carries a published Base Flood Elevation and a federal flood-insurance requirement on mortgaged homes (FEMA Flood Map Service Center). To confirm your specific parcel's zone, look it up on the FEMA Map Service Center at msc.fema.gov. Even outside a mapped zone, Malden's dense urban runoff and high groundwater can keep a basement wet, which is what 603's interior drainage system is built to handle.
Does 603 dig around the outside of the foundation to waterproof a Malden basement?
No. 603 waterproofs from the inside with the Forever Dry System — a full-perimeter drain, a sump pump for every 120 feet of drain, a wall vapor barrier and a dehumidifier. Our position (Nik's) is that exterior excavation around the foundation is a poor fix that often fails within about two to three years, while a properly installed interior drainage system is the durable solution. Basement waterproofing runs $3,000–$30,000 depending on the size and condition of your basement.



