As a Hastings flat roof repair contractor, we patch seams, punctures, and drain flashing on single-ply, built-up, and modified bitumen roofs.
Fit Check
Hastings flat roof repair works when the damage is local and the membrane around it still flexes. Compare a patch with a section replacement.
Flat Roof Conditions
Low-slope roofs fail at a handful of predictable spots. These six cover most calls.
Repair Options
Each problem has a matching repair, plus the point where a patch stops being the right answer.
| Problem | Repair We Make | When It Falls Short |
|---|---|---|
| Open seam | Clean, prime, and weld or tape a cover strip over the lap | Seams opening along most of the roof |
| Puncture or tear | Matching membrane patch with rounded corners | Wet insulation spreading past the cut |
| Ponding at a drain | Tapered crickets, a lowered sump, or an added drain | Deck sag that needs structural repair first |
| Blister on built-up | Cut, dry, and reseal with new plies | Blisters across large areas of the field |
| Cracked base flashing | New flashing raised to height and terminated at the wall | Rotted wall or coping behind the flashing |
A drip under a flat roof usually means the board above is already wet. Call, and we will help you find the spot and limit the spread.
Call UsStanding water at a drain or a seam you keep watching? Schedule an inspection and get the repair priced in writing.
Schedule Your Free InspectionRepair Sequence
Five decisions take a flat roof from a wet stain to a closed, recorded repair.
Every seam, drain, and flashing on the low-slope field gets walked, and stains inside are matched to the roof above. A core cut or meter reading tells us whether the board under a bad seam is wet.
One tear in flexible membrane takes a patch. Three patches crowded into one bay, or soaked board below, call for cutting out that section and rebuilding it with new insulation.
TPO and PVC take hot-air welded patches, EPDM takes primer and seam tape, and built-up or modified bitumen takes new plies set in matching asphalt or adhesive.
Ponding gets a cause fix: crickets of tapered insulation, a lowered drain sump, or another drain or scupper. Patching inside a ponding ring without moving the water only resets the clock.
Welded seams get probed, drains get a flow check with a hose, and the repair notes mark each patch location on a roof sketch for your files.
What It Protects
Water on a low-slope roof hides in the board long before it shows on a ceiling.
Related Repairs
When the problem sits on a metal roof, inside the building, or around plant equipment, one of these fits better.
Panel roofs over shops and warehouses need new screws, washers, and lap sealant rather than membrane patches.
Metal roof repair
If the stain is clear but the entry point is not, leak tracing finds the failed seam or curb before anything gets patched.
Leak repair
Plant roofs with exhaust fans and heavy curbs need repairs planned around production and the chemicals on the deck.
Industrial roof repair
Question about your own roof?
Tell us the membrane type if you know it and where water collects after rain.
Call UsFlat Roof FAQ
Three things set most of the price: how large the damaged area is, which membrane is on the roof, and whether the insulation under it is wet. A single open seam is small work. A torn section at a curb with soaked board below takes more labor and material, and roof height or hard access adds to it.
Heavy rain raises the water level on the roof above seams and flashing that stay dry in a light shower. Clogged drains and scuppers make it rise faster, low spots hold water against weak laps, and flashing that stops too low at a wall lets water run behind it. Clearing drains and raising flashing stop many of these leaks.
The fix gives the water somewhere to go. Tapered insulation crickets steer it to a drain, an added drain or scupper shortens its path, and a sagging deck section gets corrected underneath. A lower drain sump helps too. Patching the membrane inside a ponding ring without changing the slope only delays the next leak.
A patch is enough for one puncture, tear, or open seam where the surrounding membrane still bends without cracking and the board under it is dry. Patches fail when the membrane around them is brittle or shrinking. Several patches clustered in one small area point to replacing that section.
Yes, when the damage is local. Loose or blistered plies get cut back, the area dries out, and new plies of matching material go in. Gravel gets swept aside and spread back after the repair. Blisters get opened and resealed only when they hold moisture or have cracked through.
Send the address and a note on where water stands or drips. We will check the board, then price the patch or section in writing.
