Brooklyn · brownstones, walk-ups & storefronts
Subfloor repair & preparation in Brooklyn
Gemini Floor Services is a family-owned flooring company working out of 229 Sumter St in Bed-Stuy, and much of what we do in Brooklyn starts below the finished surface. As your flooring contractor we open up the old floor, find out what is really holding it up, and fix that layer before any new boards, vinyl or refinish goes on top. Owner Deyal Ramnarine brings more than 30 years in the trade to that judgment call.
Neighborhoods we serve: Park Slope, Brooklyn Heights, Bay Ridge, Williamsburg, Bushwick, Prospect Heights, Flatbush, Sunset Park, Carroll Gardens, Midwood, Borough Park, Crown Heights, Bed-Stuy, DUMBO.
What we find under Brooklyn floors
A brownstone built in the 1890s rarely has a single tidy layer under the living room. Pull back the top boards and you may see original pine plank laid straight across the joists, a sheet of lauan someone added in the seventies, vinyl tiles glued over that, and a few patches of newer plywood near the kitchen. Row houses in Crown Heights and Flatbush often show joists that have settled toward the middle wall. Garden apartments and ground-floor stores in Sunset Park or Williamsburg usually sit on concrete, sometimes with wood strips fastened to the slab long ago.
None of that is a problem by itself. It only becomes one when the new floor is chosen without knowing it is there. So the first thing we do on any Brooklyn visit is look, probe soft spots, take moisture readings and note how far the floor is out of level before we suggest a material.
The work we do on the base
Tear-out and haul-away
We lift the existing finish flooring and any failed underlayment, bag the debris and take it off site, planning the carry-out around stoops, narrow stairs and shared hallways.
Fastening loose sheets
Squeaks and bounce usually mean plywood or plank has pulled away from the joists. We screw those areas back down so the base stops moving.
Replacing rotted sections
Wood that has gone soft from an old leak, a radiator valve or a bathroom overflow gets cut back to solid material and replaced with new plywood.
Leveling dips and humps
We feather out low areas and grind or plane high ridges so boards, plank or tile can lie flat without rocking.
Underlayment
Floating products get a cushioned layer where the base is not perfectly true, and co-ops that require a sound mat get the approved type.
Choosing the floor to suit the base
The layer underneath decides a lot about what can go on top. Solid hardwood needs a sound plywood deck it can be nailed or stapled into, which is why above-grade brownstone rooms with a firm wood base are the natural home for it. Engineered boards have a layered core that tolerates humidity swings better and can be nailed, glued down or floated, so they are often the better answer over concrete, in garden levels, or above radiant heat when the manufacturer allows it. Vinyl plank also goes over a slab once the moisture readings are acceptable.
We talk through those choices with you at the measure, and if you already have a product picked out, we tell you honestly whether your base can support it or what it would take to get there. You can read more on our Brooklyn hardwood installation page.
After a leak or flood
Water is the most common reason a Brooklyn subfloor fails. Boards that cupped after a burst pipe often pull their nails loose, and the wood beneath can stay damp long after the surface looks dry. Before we sand or replace anything, we check for wet or spongy spots, lingering moisture and fasteners that let go. If the base needs to dry out or be rebuilt, that goes on the estimate, because a new finish laid over hidden moisture will not hold up. Our water-damaged floor repair page covers that process in more depth.
What affects the cost
Base work is quoted once we have seen the room, and it appears as its own line on your estimate so you know exactly what is included. The main factors are:
- Area: how many square feet need attention, and whether it is one patch or a whole floor.
- Layers to remove: old flooring, glued tiles, earlier plywood patches or strips fastened to concrete.
- Damage: the amount of soft or rotted wood that has to be cut out and replaced.
- Leveling: how far the floor is out of flat, and whether doorways, cabinets and radiator pipes limit the build-up.
- Underlayment: cushioned, moisture or sound-rated layers your product or building calls for.
- Access: walk-up floors, parking on the block and building work hours.
To get a rough planning number first, use our Instant Preliminary Estimate, then book a free on-site measure.
Co-ops, row houses and shops
In co-op buildings around Brooklyn Heights, Park Slope and DUMBO, tear-out is the loudest part of the job, so we book it inside permitted hours, protect common hallways and bring a certificate of insurance for the managing agent. We are licensed and insured, and base repairs are covered by the same 5-year workmanship warranty written on the rest of your job.
Private row houses give us more freedom with scheduling but less room to stage materials, so we plan where plywood can sit and how debris leaves without blocking the sidewalk. For offices, salons and retail spaces we can work around opening hours; see commercial flooring for more on business jobs.
Photos from our work
A real Gemini job photo, labeled by the type of work. Full gallery →
Frequently asked questions
Why fix the subfloor before a new floor goes in?
Every finished floor copies the surface under it. Loose, soft or uneven base material leads to squeaks, gaps, cracked tile and boards that move, so we correct it first.
Can you tell if my Brooklyn subfloor is still wet from a leak?
Yes. We take moisture readings and probe for soft areas at the measure. If drying time or replacement is needed, we write that into the estimate before any other work.
How flat can you make an old brownstone floor?
We can usually improve it a great deal, but a century-old house may not become perfectly level. We show you what is realistic and how it affects thresholds before we begin.
Will my co-op ask for a sound underlayment?
Many Brooklyn co-ops and condos do. Send us the alteration agreement and we pick an underlayment that meets it.
Is base repair listed separately on the estimate?
Yes. Repairs, leveling and underlayment show up as their own line so you can see the scope.
Can you work on a concrete slab in a garden apartment or store?
Yes. We check moisture, deal with old wood strips or failed compound, and prepare the slab for engineered wood, vinyl plank or tile as the product allows.
Do you repair subfloors outside Brooklyn?
Yes. See subfloor repair in Manhattan, subfloor repair in Queens, subfloor repair in the Bronx, subfloor repair in Staten Island, subfloor repair in Nassau County and subfloor repair in Suffolk County.
Which Brooklyn neighborhoods do you work in?
Our Brooklyn flooring by neighborhood page lists the areas we cover and links to local pages.
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