Cellars and Garden Levels
Basement Waterproofing in South Slope, Brooklyn
Damp walls, seeping floors and heavy rain backups dealt with in the cellars and garden levels of row houses and walk up buildings.
- Interior drains, sump pumps and crack injection
- Downspout and grading fixes
- Free visit and a written price
Why Do South Slope Cellars Get Wet?
South Slope is inland, so its water problems come from rain, not tides. Old foundation walls let moisture through cracks and open joints, roof and yard water collects against the wall on sloped lots, and heavy storms can overload the sewer and back it up through floor drains.
The blocks rise toward Prospect Park, and water runs downhill along and under the ground. A cellar on the lower end of a block takes more of it. Cellars and garden levels in brick and frame row houses sit partly or fully below grade, so every wall is in contact with wet soil after rain.
- Damp patches and mineral stains on cellar walls
- Water seeping at the joint between wall and floor
- Musty smell and peeling paint
- Puddles after heavy rain
- Floor drains that back up in a storm
- Cracks that weep in wet weather
Old stone and brick foundations are porous by nature. They were built to be sturdy, not sealed, and the mortar between the stones lets damp through even when there is no visible crack. Newer coatings and drains work with that reality. They manage water and give it somewhere to go, and they do not pretend the wall is a bathtub.
Garden level apartments add stakes. A finished space with floors, drywall and furniture takes more damage from a leak than a plain cellar does.
Cellar Taking On Water When It Rains?
Tell us where it shows up. Photos of the walls and floor help us plan a useful visit.
How Do You Keep a Row House Cellar Dry?
We find where the water enters and treat that path. Common fixes include interior drains that carry water to a sump pump, crack injection for active leaks, wall coatings on sound surfaces, and grading and downspout changes outside. Exterior membranes are used where digging is practical.
Row houses limit the choices. Lots are narrow, yards are small and there is often no way to dig along a party wall. That is why interior drainage is so often the practical answer here. A channel is set along the base of the wall, water flows to a sump pit and a pump moves it out.
Before any of that, we check the simple items. Are the gutters clear? Do the downspouts empty at the foundation? Is the yard sloped toward the house? Fixing those can reduce the load on any system, and it costs a small fraction of a full install.
We size a sump pump to the job and tell you where the discharge will go. Water pumped out must reach a legal place, and it should not run across a neighbor's yard or freeze on the sidewalk in winter. We plan that route at the visit and mention any city rules that may apply.
Cracks that leak get injected, and open mortar joints in old stone or brick get repointed. We coat walls only where the surface is sound and dry enough for the coating to bond.
Sewer Backups
When the Water Comes Up Through the Floor Drain
Some cellar flooding does not come from the soil at all. In heavy rain, combined sewers can fill and push water back up through drains in low floors. It smells, it carries waste and no wall coating will stop it.
A backwater valve on the sewer line can help, and a licensed plumber is the right contact for that work. We can handle the waterproofing side and coordinate with your plumber so the two systems work together.
After a backup, do not wait. Sewage in a cellar is a health matter as well as a repair, and cleanup should be done by people with the right protection. Once the space is clean and dry, we can look at the floor, walls and drains so the next storm does less harm.
South Slope has no special flood exposure beyond that heavy rain sewer risk, but a backup can still ruin a finished cellar. Keep valuables off the floor, and keep electrical equipment raised.
Do You Need a Permit to Waterproof a Cellar in South Slope?
Interior drainage, crack injection and coatings on private property usually do not need the DOT sidewalk permit. Excavation, structural repair and drainage tie ins can involve Department of Buildings permits or the plumbing rules. Check the current requirements with the city before any work starts.
If exterior work reaches the sidewalk, the sidewalk part generally needs a DOT permit, which we file. We list each permit in the written price so you know who is responsible for what.
Winter matters little for interior work, so cellar jobs can go ahead in almost any season. Tell us if you rent part of the building. Garden level tenants, insurance claims and lease obligations can affect the schedule, and we plan around them.
Our work carries a warranty, and the written terms come with your estimate so you can read them first.
Why Us
Why South Slope Owners Ask Us About Wet Cellars
25+ years in the field
We have dealt with damp foundations in older buildings for over 25 years.
Licensed and insured
Our crews work under construction, injury and workers compensation insurance.
The water path comes first
We find where the water enters before we sell you a system.
Nearby
Waterproofing Near South Slope
We waterproof cellars in the neighborhoods around South Slope as well.
FAQ
South Slope Waterproofing Questions
Note when it appears. Water after rain at the wall points to seepage or cracks. Water from a floor drain with an odor points to a sewer backup. We check each path on the visit.
Neither is better in every case. Interior drains suit tight row house lots. Exterior membranes protect the wall but need digging. We recommend based on your site.
Yes for groundwater and seepage, which is what it is built for. It does not stop a sewer backup, and it needs power, so we discuss backup options.
Once the water path is fixed and the space is dry, finishing is a reasonable step. Use materials that tolerate moisture.
A crack injection alone is often a one day job. Drains and pumps take longer. The schedule is listed on your written price.
Yes. Call (718) 468-8803 to schedule a free look at your South Slope basement, followed by a written price.
Free on site estimate
Dry Out Your South Slope Cellar
Find the water path, fix it and get the plan in writing.
Contact
Ask About Your South Slope Cellar
Note where the cellar water appears and after what kind of weather. Send photos of any stains, weeping cracks or pooled water.
- Call us(718) 468-8803
- HoursMon to Sat, 9:00 AM to 6:00 PM
- Free on site estimate with a written price
- Licensed and insured, 25+ years in business
- We handle DOT sidewalk permits
- Serving Manhattan, Brooklyn, Queens and the Bronx
Get Your Free Estimate
Takes about a minute. No cost and no obligation.