Single-ply
TPO
Welded seams split with age and movement. We re-weld them with hot air, and repairing a leaking TPO membrane has its own page.
Commercial flat roofs · Brooklyn
Commercial Building Repair for Leaking Roof in Brooklyn
Commercial building repair for leaking roof work from BST Roofers starts on your flat roof. We find the leak source, stop the active leak, then make the permanent repair.
Offices, retail storefronts, warehouses and mixed-use buildings get a fast response, and the fix is usually smaller than the stain suggests.
Is water coming in right now?
Tracing the real entry point
Where it shows inside, and where it gets in
The ceiling stain is rarely right under the hole, since water runs along the deck first.
| What you see inside | Where it usually enters | What we fix |
|---|---|---|
| Stain under a rooftop unit | HVAC curb flashing | Flashing repair |
| Stain along an outside wall | Parapet wall flashing or coping | Flashing repair |
| Drip mid-floor after rain | Open membrane seam | Seam repair |
| Water near columns or drains | Clogged drain or ponding water | Drain clearing |
| Ceiling stains spreading for days | Wet insulation under the membrane | Moisture survey, then a targeted patch |
Swipe the table sideways to see every column
Less downtime for tenants
Keeping the business open while we work
Our crew works from the roof, so staff and customers keep using the floor below. Restaurants and retail storefronts get repair times set around opening hours.
Inside, we contain the drip with sheeting and buckets where it lands. Offices, warehouses and apartments above a store keep running.
The floor below stays open
From your call to a dry roof
Four steps after you call
-
01
You call and we set a time
While you wait, read what to do inside the building before the crew arrives.
-
02
We pin the source
Leak detection on the membrane, plus a moisture survey when stains keep spreading.
-
03
The leak stops that visit
Emergency tarping or patching keeps the water out the same day.
-
04
Permanent repair, photographed
The seam, flashing or drain is repaired for good and photographed for your records.
The flat roofs we repair
Which flat roof covers your building?
Single-ply
Rubber
EPDM
Lap seams and flashing let go as the adhesive ages. We re-seam them and install new flashing, as covered under how EPDM roofs leak and get fixed.
Torch-on
Modified bitumen
Blisters and open laps let water under the cap sheet, so we cut them out and torch on a patch.
Commercial leak FAQ + free estimate
Answers for owners and managers, plus your free estimate
Can you stop it while it is still raining?
Yes, usually. We tarp or patch the area to keep water out until the roof dries enough for the permanent repair.
Will the repair hold, or does the roof need replacing?
It holds when the surrounding membrane is sound. If yours is not, we say so and explain when a commercial roof is past patching.
Do you work on occupied buildings?
Yes. Your tenants and your business stay put while we work.
Before the next rain