Base ply
A smooth reinforced base sheet laid with laps offset from the cap.
Flat Roofing
Modified Bitumen Roofing Scotch Plains, NJ
A roofer in Scotch Plains 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 (908) 562-6873 to reach a local roofer.
Modified bitumen is asphalt with rubber or plastic polymers mixed in, made into reinforced rolls that go down in two or more layers. The two main types are SBS, which is rubbery and flexible in cold weather, and APP, which is more plastic-like and is usually torched. With two or three plies, the finished roof is thick and puncture resistant.
There are several ways to put down mod bit, and each suits different buildings. Torch-applied sheets fuse tightly at the laps, though the open flame demands care around wood framing, insulation and roof edges. Self-adhered and cold-adhesive systems avoid the flame and are often chosen for homes and occupied buildings.
A few details help the roofer plan. Note any blisters or bubbles, cracking in the cap sheet, bare spots where granules have washed off and laps that are lifting at the edges. Mention whether the roof has been coated or patched with roofing cement, since that changes how new material will stick.
If the problem goes deeper than it first looked, a Scotch Plains roofer may also recommend flat roof replacement or flat roof repair.
Dealing with this in Scotch Plains, NJ right now? Call (908) 562-6873 to talk to a local roofer.
Call nowThe process
How a modified bitumen roof is installed
Each layer of a mod bit roof has its own job.
Survey the existing roof
A core cut and a walk of the roof show how many layers exist and whether moisture is trapped. With two roofs already in place or wet insulation present, a tear-off is the norm.
Prep the base
The deck is stripped, repaired and cleaned so the new layers lie flat. Rigid insulation and tapered crickets go down next to improve drainage.
Install the base ply
The first ply is nailed or mechanically fastened on wood, or set in adhesive over insulation. The roofer offsets the laps so no seam sits directly over another.
Lay the top ply
A cap sheet with mineral granules is applied over the base sheet. On torched laps, a steady bleed-out of asphalt at the edge shows a good seal.
Detail the edges
Base flashing runs up walls and parapets in two plies and is fastened at the top under metal counterflashing or a termination bar. Edge metal, drain flashing and pipe flashings complete the system.
Walk the finished roof
If any torching was done, the crew stays on watch after the flame goes off to make sure nothing is smoldering. The last step is a full walk to confirm laps and flashings are sealed.
What is included
Parts of a modified bitumen roof
Granulated cap
A granulated cap sheet in white or a dark color to shield the asphalt from sun.
Drain flashing
New edge metal and drain flashings so water leaves the roof where it should.
Insulation
New insulation where the roof is torn off built to current code levels.
Base flashing
Two-ply flashing up walls and parapets where most flat roof leaks start.
Related service
Torch Down Roof Repair Scotch Plains, NJ
Repairing a torch-down roof usually means cutting out the bad section and fusing new modified bitumen over it. For blisters and splits, the damaged section is opened up, dried and covered with a larger patch. Loose granules are embedded in the bleed-out so the patch does not weather quickly.
In Scotch Plains, many torch-down repairs sit close to wood framing, so fire safety is part of every job. Where a flame could reach wood or insulation, a self-adhered patch is the safer choice. A fire watch after torching is a basic part of any torch-down repair.
Related service
Built Up Roofing Scotch Plains, 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. With age, these roofs blister, crack at the flashings and open at the edges.
Most built up roof repairs in Scotch Plains start by clearing the gravel, then patching with new plies and setting gravel back in place. Because these roofs are heavy, recovering over one can strain the structure, and many owners choose a tear-off when the time comes. The replacement is often a mod bit or single-ply roof that is lighter and easier to maintain.
Local help
Modified Bitumen Roofing Near Me
Modified bitumen roofs in Scotch Plains cover everything from older homes with flat sections to strip centers and churches. Across Scotch Plains and nearby towns like Fanwood, Westfield, Garwood and Plainfield, 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 Scotch Plains, NJ or nearby towns like Fanwood, Westfield, Garwood and Plainfield, call (908) 562-6873 to reach a roofer who covers your street.
How the weather here affects roofs around Scotch Plains
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. That is why roof repair in Scotch Plains is busiest after a hard winter and before the next one.
Why call
Why fix it now
Less damage
Small roof problems caught early usually stay small repairs.
Familiar with local homes
Roofers in Scotch Plains know the roof types and weather wear common in local homes.
Straight answers
Ask your questions before you agree to anything.
Modified Bitumen Roofing questions
Can modified bitumen be installed over an existing 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.
Should I coat my modified bitumen roof?
A coating can extend a modified bitumen roof that is aging but still dry and sound. Loose granules are cleaned off, blisters and open laps are repaired and a primer may be needed to keep asphalt from bleeding through. White coatings reflect sun, which helps the asphalt last.
Is torch-down roofing safe?
Torching uses an open flame, so it carries a real fire risk that has to be managed. 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.
What is the lifespan of a torch-down roof?
A two-ply modified bitumen roof commonly lasts around 15 to 25 years. Drainage and the condition of the cap sheet granules make the biggest difference. Some owners extend the roof with a coating once granules start to thin.
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. The polymer sheets stay flexible in cold and are easier to repair.
More questions? Call (908) 562-6873
Other services that may help
Flat Roof Replacement
Full replacement of failing flat roofs, with a moisture survey deciding tear-off or recover, and new flashing at every wall, curb and drain.
Learn moreFlat Roof Repair
Fixing open seams, blisters, splits, ponding and failed flashing on flat and low slope roofs, 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, with seams welded into one watertight sheet.
Learn moreCommercial Roof Replacement
Full replacement of membrane, built-up and metal roofs on commercial buildings, planned around rooftop units and drains.
Learn more
Looking for something else?
See all roofing servicesGet modified bitumen roofing help in Scotch Plains
Call (908) 562-6873 to talk to a roofer serving Scotch Plains, NJ.