Blister repair
Blisters cut open, dried out and sealed under a matching cap sheet patch.
Call (929) 219-1763Modified Bitumen Roof Repair in Brooklyn, NY
Modified bitumen is the layered, asphalt-based roof on many older Brooklyn rowhouses. We repair blisters, cracks, open laps and flashing with matching cap sheet, applied flame-free wherever torch work would be a fire risk.
- Typical repair cost
- $300–$1,500
- Most repairs
- One visit
- Repair method
- Flame-free cap sheet
- Workmanship warranty
- 10 years
Our Modified Bitumen Roof Repair Services
We repair mod-bit with matching modified bitumen, installed self-adhered or cold-applied so there’s no open flame on your roof.
Cap sheet patching
Cracked or split areas cut back to sound roof and patched with new cap sheet.
Call (929) 219-1763Lap & seam sealing
Open laps cleaned, primed and re-bonded so water can’t get between the sheets.
Call (929) 219-1763Flashing repair
Two-ply flashing rebuilt at parapets, chimneys, curbs and hatches.
Call (929) 219-1763Granule loss & recoating
Worn, bare areas recoated to protect the asphalt from the sun and seal fine cracks.
Call (929) 219-1763Penetration & drain repair
Pipes, vents and drains re-flashed with mod-bit target patches and sealed into the cap sheet.
Call (929) 219-1763Modified Bitumen Roof Repair Cost in Brooklyn
Modified bitumen is repaired by cutting out blisters and bad laps and installing new cap sheet, using flame-free methods near walls and wood. The price depends on how many blisters and laps are failing and whether the flashing at the parapet needs rebuilding. Most mod-bit repairs cost $300 to $1,500.
What changes the price
- Number and size of blisters
- Laps that have opened and need re-sealing
- Parapet and base flashing condition
- How many old roof layers are under the cap sheet
You get a written price after a free inspection, before any work starts.
Call for your exact price| Repair | Typical Brooklyn price |
|---|---|
| Blister cut and patch | $300 – $650+ |
| Lap or seam re-seal | $400 – $1,000+ |
| Parapet or base flashing repair | $500 – $1,400+ |
| Cap sheet section replacement | $700 – $2,000+ |
| Reflective (silver) recoat of the whole roof | $1,200 – $3,500+ |
| Leaks in several areas | $1,500 – $4,000+ |
| Emergency call outside business hours | add $200 – $350+ |
Signs Your Mod-Bit Roof Needs Repair
Modified bitumen ages slowly, but these signs mean water is close to getting in.
Call for a free inspection- Blisters or soft bubbles in the roof surface
- Cracked, split or alligatored cap sheet
- Open laps where the sheets overlap
- Bare black spots where the protective granules have worn away
- Flashing cracked or pulling away at parapet walls, chimneys or the roof hatch
- Soft or spongy spots when you walk on the roof
How We Repair a Modified Bitumen Roof
Mod-bit repairs need a dry, clean base and a fully bonded patch. We never torch over wood framing or near shared walls.
- Find the sourceWe trace the leak to the blister, lap or flashing and photograph the damage.
- Cut out and dryBlistered or damaged material is cut back and the area dried and primed.
- Patch flame-freeMatching self-adhered or cold-applied cap sheet is installed and the edges sealed, with no torch near wood or shared walls.
- Photos and warrantyYou get before-and-after photos and your warranty in writing.
Why Mod-Bit Roofs Fail in Brooklyn
- Trapped moisture. Water caught between layers expands in summer heat and forms blisters.
- Sun damage. Once granules wear away, UV dries out the asphalt and it cracks.
- Aging laps. Overlaps lose their bond over time and open up.
- Freeze-thaw winters. Small cracks fill with water, freeze and grow wider each season.
When Repair Isn’t Enough
Most mod-bit problems are repairable, and a recoat can extend an aging roof by years. We’ll recommend a new roof only when blisters and cracks cover most of the surface, the insulation is wet over large areas, or the roof already has too many layers to patch. You’ll get photos and both prices.
Emergency on your mod-bit roof? We answer 24/7.
Call (929) 219-1763Modified Bitumen Roof Repair FAQs
Still have a question about your mod-bit roof? Call us.
Call (929) 219-1763How can I tell if my roof is modified bitumen?
Mod-bit is laid in rolled sheets about three feet wide with overlapping seams. The surface is usually covered in granules or a silver coating.
How long does a modified bitumen repair take?
Most mod-bit repairs are finished in one visit. Larger cap sheet sections or flashing rebuilds can take a second day.
Will the patch match the color of my roof?
We use cap sheet with the closest granule color available. Older roofs have faded, so a new patch may look brighter at first and weathers in over time.
Can you repair a mod-bit roof in cold weather?
Yes, with cold-applied materials. Self-adhered sheets need milder temperatures to bond, so in deep cold we use cold adhesives or make a temporary repair until it warms up.
Need Modified Bitumen Roof Repair in Brooklyn?
Free inspection, photos of the problem, and a written repair price before any work starts.