On the night of September 1, 2021, Ida's remnants dropped 3.15 inches of rain on Central Park in a single hour, the most rain in one hour ever recorded there. Thirteen people died in the city that night, most of them in Queens, several in basement apartments in Hollis and Flushing. For many families in Queens, Brooklyn and Staten Island, that storm changed how they think about the space below the house.
This guide is about the part that comes after: tearing out a flooded basement, drying it, and choosing floors that will come back the next time. It is not a guide to making a basement livable. A basement that people sleep in needs legal exits and Department of Buildings approval, and no floor makes a flood-prone basement safe to sleep in.
The first days after water gets in
- Stay out of standing water until the power is off. If the electrical panel is in the basement, call an electrician or your utility before you go down.
- Photograph everything before you move it: the water line on the walls, the floor, the boiler, the contents.
- Assume the water is dirty. When sewers back up in a heavy storm, what comes up through the basement drain is sewage. Treat river and street water the same way.
- Get the wet, porous materials out fast. Mold starts within a day or two in a warm basement.
What goes to the curb
- Carpet and carpet pad
- Laminate and engineered wood, which swell and delaminate
- Drywall and insulation below and somewhat above the water line
- MDF baseboards and door casings
- Any floating floor that sat in sewage or street water, including vinyl plank with an attached pad. The pad and the click joints trap contamination you cannot reliably clean out.
What can often be cleaned and kept
- Porcelain or ceramic tile set in mortar
- Sealed concrete and epoxy floors
- Rigid core vinyl (SPC) that only saw clean water, like a burst supply line. Unclick it, wash it, let it dry and relay it.
Dry it before you rebuild
The most common mistake after a flood is closing up the walls and putting down a new floor while the slab is still wet. Concrete holds water for weeks. Run fans and dehumidifiers, keep the heat on, and test before you rebuild. Our installation guide calls for a slab relative humidity of 85% or less with in-slab probes, or a vapor emission rate of no more than 5 lbs per 1,000 sq ft in 24 hours. Our basement slab install guide walks through both tests.
What to put back, room by room
| Area | Our pick | Why |
|---|---|---|
| Den, playroom, home office | SPC: Montclair 6.5mm or Citadel 8mm | Waterproof core, attached pad, comes apart to dry |
| Laundry, boiler or utility room | Porcelain set in mortar, or sealed concrete | Floor drains and sloped floors are not for floating floors |
| Basement bathroom | Porcelain | Survives standing water and cleans up |
| Areaway or side-door entry | Porcelain or sealed concrete | First place water and grit come in |
| Basement stairs | Not SPC | Our install guide says no floating planks on stairs |
FEMA's January 2025 bulletin on flood damage-resistant materials agrees with the hard surfaces in that table: porcelain tile in mortar is acceptable for areas that flood, while carpet, laminate and engineered wood are not. Click vinyl plank is not on FEMA's list. We recommend SPC for basement rooms that might take water, not for space designed to flood.
Make the next flood smaller
- Install a backwater valve. NYC's Department of Environmental Protection urges homeowners to consider one to keep sewer water from backing up into the house. A licensed plumber can tell you if your line is a fit.
- Move water away from the house. Clean gutters, connect downspouts, and seal foundation cracks.
- Raise what you can. Boiler, water heater, washer, dryer and the electrical panel on platforms or moved upstairs.
- Keep spare flooring off the floor. Store two boxes from the same batch on a high shelf so any repair matches.
- Know what your policy pays for. FEMA's flood insurance does not cover floor coverings or finished walls in a basement. The floor you choose is likely the floor you pay to replace.
Borough by borough
- Queens (Hollis, Jamaica, Flushing, Woodside, Forest Hills): Ida showed how fast a low basement on a low street fills during a cloudburst. Use hard, cleanable floors in the lowest rooms and SPC only in finished rooms with a working sump and backwater valve.
- Brooklyn (row houses and two-families from Cypress Hills to Canarsie): many cellars sit below street level with the laundry and boiler in the same open room. Porcelain or sealed concrete for the mechanical side, SPC for any finished side.
- Staten Island (Midland Beach, New Dorp Beach, South Beach and the rest of the east shore): this is surge country, not just rain. Anything below the flood line should be tile or concrete.
The floors in this guide
Frequently asked questions
What flooring should I put in a basement in Queens or Brooklyn after a flood?
Use rigid core SPC vinyl plank in finished rooms like dens, playrooms and offices, and porcelain tile set in mortar or sealed concrete in laundry and boiler rooms, bathrooms and any area with a floor drain. Do not put carpet, laminate or engineered wood back in a basement that has flooded.
Can vinyl plank flooring be saved after a basement flood?
Rigid core SPC that only saw clean water can usually be unclicked, washed, dried and relaid. Planks that sat in sewer backup or street water should be replaced, because the attached pad and click joints trap contamination.
How long should a basement dry before new flooring goes down?
Until the slab passes a moisture test, which often takes weeks. Run fans, dehumidifiers and heat, then test. Our installation guide calls for 85% relative humidity or less with in-slab probes, or a vapor emission rate of 5 lbs per 1,000 sq ft in 24 hours or less.
Do I need a backwater valve in my NYC basement?
NYC's Department of Environmental Protection urges homeowners to consider a backwater valve to keep sewer water from backing up into a home during heavy rain. A licensed plumber can tell you whether one suits your sewer line.
Rebuilding a basement in New York City?
Homeowners: order samples to see the colors in your own light, or talk to our team about your project.
Contractors and dealers: order in the Pro Shop by 2 PM for delivery in 24–48 hours, or apply for a trade account.
