Base ply
A smooth reinforced base sheet laid with laps offset from the cap.
Flat Roofing
Modified Bitumen Roofing Harrison, NJ
A roofer in Harrison can install, repair or replace a modified bitumen roof, the layered asphalt membrane often called torch-down, which holds up well to foot traffic and patches easily. Dial (551) 348-3304 to talk through modified bitumen with 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. SBS sheets stay flexible in the cold and can be torched, mopped, cold-applied or self-adhered, while APP sheets are almost always torched. With two or three plies, the finished roof is thick and puncture resistant.
The application method is one of the first decisions on a modified bitumen job. Torch-down uses an open flame to melt the back of the sheet onto the layer below, which makes strong laps but calls for strict fire safety near wood and insulation. For homes and buildings where open flame is a concern, self-adhered or cold-process sheets are the usual answer.
Mod bit fails in predictable ways, which helps when you call. Watch for raised blisters, alligator cracking, bare patches and open laps, especially near walls and drains. Mention whether the roof has been coated or patched with roofing cement, since that changes how new material will stick.
Modified Bitumen Roofing is often paired with flat roof replacement and flat roof repair, depending on the cause.
Dealing with this in Harrison, NJ right now? Call (551) 348-3304 and describe the problem to a roofer who works in Harrison.
Call nowThe process
What a mod bit roof job involves
Here is how a typical modified bitumen job runs.
Inspect the roof
A core cut and a walk of the roof show how many layers exist and whether moisture is trapped. Those findings decide whether the old roof must come off.
Ready the substrate
On a tear-off, everything comes down to the deck and damaged plywood or planks are replaced. Where the roof ponds, tapered insulation is added to move water off.
Install the base ply
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. On torched laps, a steady bleed-out of asphalt at the edge shows a good seal.
Flash the walls
Parapets and curbs are flashed with mod bit plies, then capped or counterflashed with metal. Edge metal, drain flashing and pipe flashings complete the system.
Final check
If any torching was done, the crew stays on watch after the flame goes off to make sure nothing is smoldering. A final walk checks laps, flashings and drainage.
What is included
What a mod bit roof includes
Edge metal
Gravel stop or drip edge at the perimeter to finish the system cleanly.
Cap sheet
The finished top layer with protective granules that takes foot traffic well.
Wall flashing
Two-ply flashing up walls and parapets where most flat roof leaks start.
Insulation
Rigid boards with tapered crickets to improve drainage and efficiency.
Related service
Torch Down Roof Repair Harrison, NJ
Torch down roof repair fixes the leaks that develop in torch-applied modified bitumen: open laps, blisters, splits and failed wall flashing. Blisters are cut open, dried, resealed and covered with a patch of new cap sheet that laps well beyond the cut. Fresh granules over the hot asphalt help protect the repair.
Repairs near walls, vents or wood trim in Harrison call for careful torch handling. Near combustible materials, a cold-process or peel-and-stick patch can replace torching. After torching, a watch period for smoldering material is standard practice.
Related service
Built Up Roofing Harrison, NJ
A built up roof is made of several plies of felt mopped together with hot asphalt or coal tar pitch, then flood-coated and covered with gravel. When the gravel thins out, the asphalt below dries, cracks and blisters. They are durable, but they show their age at the flashings and in blistered or bare areas.
For Harrison buildings with built up roofs, patching is done with felts or mod bit after the gravel is cleared. Because these roofs are heavy, recovering over one can strain the structure, and many owners choose a tear-off when the time comes. Common replacements include modified bitumen and single-ply membranes.
Local help
Modified Bitumen Roofing Near Me
Around Harrison, mod bit replaced a lot of old tar and gravel roofs years ago, and many of those are now due for work. Across Harrison and nearby towns like Newark, Kearny, North Arlington and East Orange, older buildings may still have built-up roofs under a layer of mod bit, which is why the core cut matters, so the right method depends on what is up there now.
For modified bitumen roofing in Harrison, NJ or nearby towns like Newark, Kearny, North Arlington and East Orange, call (551) 348-3304 to reach a roofer who covers your street.
What the local climate does to a roof
Winters here are long and cold, with snow on the roof for weeks at a time and plenty of nights below freezing. Heat escaping from the attic melts snow on the upper roof, and the water refreezes at the colder eaves, building ice dams that push water up under the shingles. Coastal storms and heavy spring rain drive water sideways into flashing, valleys and old chimneys. Most homeowners in Harrison, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why not wait
Smaller repairs
A roof problem fixed early rarely spreads to the decking, the insulation or the ceilings.
Familiar with local homes
Local roofers see the same roofs and storm damage across Harrison and nearby towns.
Know what happens next
Ask your questions before you agree to anything.
Modified Bitumen Roofing questions
Are torch-applied roofs a fire risk?
The open flame is the main concern with torch-down roofing. Good crews fasten the base sheet on wood decks, keep the flame away from edges and gaps and stay on fire watch afterward. Where flame is a concern, peel-and-stick sheets are a common alternative.
Do I need a tear-off for a new mod bit roof?
The core cut tells the roofer. One dry existing roof can often stay in place under a cover board. If there are already two roofs, blistering throughout or wet insulation, a tear-off is the right move.
What is the difference between modified bitumen and built up roofing?
The two are related, with key differences in material and installation. Built up roofing uses many plies of felt mopped with hot asphalt or coal tar and is topped with gravel, while modified bitumen uses fewer, thicker polymer-modified sheets with a granulated cap. Mod bit is lighter and more flexible, which is why it has replaced built up roofing on many buildings.
How long does a modified bitumen roof last?
Most mod bit roofs last somewhere between 15 and 25 years with reasonable care. Roofs that drain well and keep their granules last longest. Some owners extend the roof with a coating once granules start to thin.
Can a mod bit roof be coated?
Modified bitumen takes coatings well when the cap sheet is sound and the roof drains. 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.
More questions? Call (551) 348-3304
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
Fixing open seams, blisters, splits, ponding and failed flashing on flat and low slope roofs, after the real leak source is found, not guessed.
Learn moreTPO Roofing
Heat-welded TPO membrane for flat and low-slope roofs, built around proper drainage, flashing and edge metal.
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
Looking for something else?
See all roofing servicesNeed modified bitumen roofing in Harrison, NJ?
Call (551) 348-3304 for a local roofer in Harrison and nearby towns.