Edge metal
Gravel stop or drip edge at the perimeter so water leaves the roof where it should.
Flat Roofing
Modified Bitumen Roofing Madison, NJ
A roofer in Madison can install, repair or replace a modified bitumen roof, the layered asphalt membrane often called torch-down, after checking the deck, the drainage and what is left of the old roof. Call (862) 431-0046 to reach a local roofer.
A modified bitumen roof is built from rolls of polymer-modified asphalt, typically a smooth base sheet under a cap sheet surfaced with granules. Sheets come in SBS, a rubber-modified type that handles cold well, and APP, a plastic-modified type made for torching. The layers give it toughness, which is why it holds up well on roofs that see foot traffic.
There are several ways to put down mod bit, and each suits different buildings. Torching gives tight, fused laps, but the flame is a fire risk near wood decks, parapets and anything combustible. For homes and buildings where open flame is a concern, self-adhered or cold-process sheets are the usual answer.
Knowing the signs makes the first conversation more useful. Watch for raised blisters, alligator cracking, bare patches and open laps, especially near walls and drains. Say whether the roof has been coated or patched before, because old coatings and mastic affect repairs.
Many modified bitumen roofing calls in Madison also turn up a need for flat roof replacement or flat roof repair.
Dealing with this in Madison, NJ right now? Call (862) 431-0046 to talk to a local roofer.
Call nowThe process
What a mod bit roof job involves
Here is how a typical modified bitumen job runs.
Survey the existing roof
A core cut and a walk of the roof show how many layers exist and whether moisture is trapped. That decides between a tear-off and laying new plies over a sound, dry existing roof.
Ready the substrate
On a tear-off, everything comes down to the deck and damaged plywood or planks are replaced. Insulation or a cover board is added, with tapered sections where water needs help reaching the drains.
Put down the first layer
The first ply is nailed or mechanically fastened on wood, or set in adhesive over insulation. Laps are offset so seams in the cap sheet do not land on seams below.
Apply the cap sheet
The granulated cap sheet is torched, set in cold adhesive or self-adhered over the base. Lap edges are checked for a continuous seal, and loose granules are pressed into any bleed-out.
Detail the edges
Parapets and curbs are flashed with mod bit plies, then capped or counterflashed with metal. New drip edge or gravel stop and properly set drain flashings finish the edges.
Walk the finished roof
Once the roof is done, the crew checks every lap, cleans up and keeps a fire watch if torches were used. A final walk checks laps, flashings and drainage.
What is included
Parts of a modified bitumen roof
Insulation
New insulation where the roof is torn off built to current code levels.
Cap sheet
The finished top layer with protective granules to shield the asphalt from sun.
Base ply
A fastened or adhered base layer laid with laps offset from the cap.
Base flashing
Flashing that runs up the wall and under metal where most flat roof leaks start.
Related service
Torch Down Roof Repair Madison, NJ
On a torch-down roof, most repairs involve resealing laps, cutting out blisters and adding new plies over damaged areas. Blisters are cut open, dried, resealed and covered with a patch of new cap sheet that laps well beyond the cut. Granules are pressed into any exposed asphalt so the patch is protected from sun.
In Madison, many torch-down repairs sit close to wood framing, so fire safety is part of every job. Many roofers switch to self-adhered or cold-applied patches in tight spots where an open flame is a risk. Either way, the roofer should stay on fire watch after any flame work.
Related service
Built Up Roofing Madison, NJ
Built up roofing stacks three or more plies of felt and bitumen into a thick, heavy membrane, finished with a layer of gravel. When the gravel thins out, the asphalt below dries, cracks and blisters. With age, these roofs blister, crack at the flashings and open at the edges.
For Madison buildings with built up roofs, patching is done with felts or mod bit after the gravel is cleared. When a built up roof reaches the end of its life, its weight and the gravel usually mean a tear-off before the new roof goes on. Many are replaced with modified bitumen, TPO or another single-ply system.
Local help
Modified Bitumen Roofing Near Me
In Madison, modified bitumen is common on low-slope roofs that see foot traffic or need a tough surface. From Madison out to Florham Park, Chatham, Summit and Morristown, roofs range from aging two-ply systems with worn granules to newer self-adhered roofs on additions, so a check of laps and flashings every year or two catches small trouble early.
Searching for modified bitumen roofing near me from Madison or Florham Park, Chatham, Summit and Morristown? Call (862) 431-0046 to talk to a roofer who works in your part of town.
Roofs in this climate
Cold winters bring snow, ice and a long stretch of freezing nights. When warm attic air melts the snow, the meltwater runs down and freezes again at the eaves, which is how ice dams form and back water up under the shingles. Coastal storms and heavy spring rain drive water sideways into flashing, valleys and old chimneys. Most homeowners in Madison, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why not wait
Smaller repairs
Small roof problems caught early usually stay small repairs.
Local knowledge
Local roofers see the same roofs and storm damage across Madison and nearby towns.
Know what happens next
Ask your questions before you agree to anything.
Modified Bitumen Roofing FAQ
Can a mod bit roof be coated?
A coating can extend a modified bitumen roof that is aging but still dry and sound. The roof is cleaned, repaired and often primed so asphalt oils do not stain the coating. A white coating also lowers roof surface temperatures in summer.
What is the lifespan of a torch-down roof?
Most mod bit roofs last somewhere between 15 and 25 years with reasonable care. Drainage and the condition of the cap sheet granules make the biggest difference. Coating an aging but sound roof can add years.
What is the difference between modified bitumen and built up roofing?
Both are asphalt roofs built in layers, but they are made differently. Mod bit replaces the many felts of a built up roof with a few thick polymer sheets, and it skips the gravel. The polymer sheets stay flexible in cold and are easier to repair.
Are torch-applied roofs a fire risk?
Fire risk with torch-down comes from the flame during installation, not the finished roof. Good crews fasten the base sheet on wood decks, keep the flame away from edges and gaps and stay on fire watch afterward. On homes, self-adhered or cold-applied modified bitumen avoids the flame entirely.
Do I need a tear-off for a new mod bit roof?
The core cut tells the roofer. If there is a single, dry, sound roof, a recovery board and new mod bit may go over it. If there are already two roofs, blistering throughout or wet insulation, a tear-off is the right move.
More questions? Call (862) 431-0046
Other services that may help
Flat Roof Replacement
Full replacement of failing flat roofs, with a moisture survey deciding tear-off or recover, so ponding and repeat leaks end for good.
Learn moreFlat Roof Repair
Repairs for leaking flat roofs, from punctures and seams to clogged drains and wet insulation, so the roof sheds water again without a full replacement.
Learn moreTPO Roofing
White, heat-welded TPO single-ply roofing for low-slope homes and buildings, sized to the deck, the drains and the way the roof is used.
Learn moreCommercial Roof Replacement
Tear-off or recover of aging commercial roofs with new insulation and drainage, planned around rooftop units and drains.
Learn more
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See all roofing servicesGet modified bitumen roofing help in Madison
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