Basement waterproofing that starts with the cause
Interior drain tile, exterior membrane, crack injection, crawl space encapsulation and the drainage that makes any of it last. Across Fairfield County, Westchester, Rockland, Nassau, Queens and the mid-Hudson Valley.
Basements do not leak. Foundations do.
The water on your floor did not start there. It came through a wall, under a slab, down a window well or in from a grade that slopes the wrong way. Which of those it was decides the entire job, and it is the one thing a phone quote cannot tell you.
So the first visit is diagnostic. We walk the outside first: gutters, downspout discharge, grade, hardscape pitch, window wells, the hatch. Then the inside: where the staining actually starts, whether the cove joint is wet, whether the crack is vertical, diagonal or horizontal, and whether the pump is doing anything.
Only then is there a system worth pricing. Sometimes the honest answer is that your problem is a downspout and forty feet of pipe.
- Exterior walked before the interior is diagnosed
- Cove joint, crack pattern and slab checked separately
- Existing pump and discharge line tested, not assumed
- Written estimate, with what we ruled out and why
Exterior waterproofing
The wall is excavated to the footing, cleaned and repaired, then given a waterproof membrane or coating rather than the damp-proofing spray most houses were built with. A dimpled drainage board goes over it to break the contact between soil and wall, and a new perforated footing drain in washed stone carries water to daylight or to a pump.
It is the most complete fix available because water never enters the structure. It is also the most disruptive and the most expensive, and on a house with a deck, a driveway or a neighbor's wall along the affected side, it may not even be possible.
- Excavation to the footing, not a partial dig
- Wall cleaned, cracks addressed, then membrane applied
- Dimple board so soil never touches the coating
- New footing drain in washed stone with filter fabric
- Backfill and grading corrected away from the house
Interior drain tile and the cove joint
A channel is cut through the slab at the perimeter, perforated pipe is bedded in stone, and the whole loop is routed to a sealed sump basin. Water arriving through the wall or up through the cove joint is intercepted below floor level and pumped out before it ever reaches the surface you walk on.
It does not stop water touching the wall. It stops water touching your belongings, and for a large share of homes in this area that is both the achievable outcome and the sensible one.
- Perimeter channel cut, not surface-mounted trim
- Stone bed and filter fabric so the pipe does not silt up
- Wall vapor membrane where block cores are holding water
- Sealed basin, not an open pit venting soil gas into the house
- Slab restored at the end of the job
The parts most quotes quietly leave out
Compare two waterproofing estimates and the gap is almost never in the headline system. It is in these.
Crack injection, done through the wall
A poured-wall crack is filled with polyurethane or epoxy under pressure through its full depth. Surface patching looks identical on day one and fails by spring.
Crawl space encapsulation
Sealed liner up the walls, sealed vents, drainage where needed, dehumidification. Half the musty smell in a house comes from a crawl nobody has opened in years.
Window wells that drain
A well with no drain is a bucket clamped to your foundation. Gravel, a real drain connection and a cover turn it back into a window.
Discharge that leaves the property
A pump emptying six feet from the wall is recycling the same water. The line has to run far enough, pitched, and it must not freeze in January.
Vapor, not just liquid
Block cores hold water and release it as humidity. A dry-looking wall can still be the reason the basement smells and the dehumidifier never shuts off.
The paperwork
A 30-year warranty is only as good as the document behind it. Ask for the terms in writing at estimate time, from us and from anyone else quoting.
The room you never go in runs your air quality
Air in a house moves upward. Whatever is in the crawl space, damp soil, mold on joists, standing water after a storm, is being drawn into the rooms above it all day. Homeowners usually blame the basement, or the age of the house, or the dog.
Encapsulation seals the earth and the vents, drainage takes care of water that arrives anyway, and a dehumidifier holds the humidity down. It is one of the few jobs where people notice the difference in how the house feels within a week.
- Reinforced liner on the ground and up the walls
- Vents sealed and rim joists addressed
- Drainage and a pump where water actually enters
- Dedicated dehumidification, not a rented unit on the floor
Water on the floor is a today problem
A pump that quit halfway through a storm. A crack that went from weeping to running. A cellar door taking water faster than it drains. Damage compounds by the hour once water is inside, so we run emergency and same-day calls rather than booking you for Thursday.
Backed by a 30-year warranty
A waterproofing system is only worth the paper behind it. Our work carries a 30-year warranty. Ask for the terms that apply to your job and we will read them with you before you sign anything, not after.
Waterproofing questions we get every week
Interior or exterior waterproofing, which one do I want?
Exterior is the more complete answer because it stops water at the outside face of the wall, before it enters the structure at all. Interior drain tile is a management system: it accepts that water will reach the wall and gives it a controlled route to a pump instead of across your floor.
Exterior costs considerably more and it takes your yard apart. Interior is faster, cheaper, and on a very large share of homes it is genuinely the correct choice. What decides it is where the water comes from, what condition the wall is in, and what is sitting on top of the excavation route. That is not a decision anyone can honestly make before standing at the house.
Will waterproofing fix the crack in my wall?
It stops the crack leaking. It does not stop the crack moving. If the wall is still under load from soil pressure or a settling footing, a sealed crack will simply reopen or a new one will appear beside it. That is why we look at whether the wall is stable before quoting a seal. See foundation repair.
Does an interior system mean digging up my floor?
A channel is cut through the slab around the perimeter, roughly a foot wide, and the concrete is replaced when the pipe and stone are in. It is dusty and loud for the days it takes. It is not the whole floor, and finished areas can usually be worked around with some demolition of the bottom of the wall.
What about waterproof paint from the hardware store?
On a wall with no active hydrostatic pressure it can help with dampness and it looks better. On a wall that water is being pushed through, it fails, and it fails in the most annoying way possible: it holds long enough for you to believe it worked, then lets go in sheets and takes the surface of the block with it.
Can you waterproof a crawl space, not a basement?
Yes. Crawl spaces are usually worse than basements because nobody goes down there to notice. Encapsulation seals the ground and the vents, drainage handles the water, and a dehumidifier deals with what is left. The house above it stops smelling like the crawl.
How long does a job take?
It depends entirely on the system and the house, so we will not print a number here that turns out to be wrong at your address. You will get a realistic duration in the written estimate, before you commit.
Find out where the water is actually coming from
Free on-site diagnosis anywhere we cover. You get an answer whether or not you hire us.