Granulated cap
The finished top layer with protective granules with fully sealed laps.
Flat Roofing
Modified Bitumen Roofing Dumont, NJ
A roofer in Dumont can install, repair or replace a modified bitumen roof, the layered asphalt membrane often called torch-down, and match the method to the building and its fire risk. Call (551) 374-2031 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. Torching gives tight, fused laps, but the flame is a fire risk near wood decks, parapets and anything combustible. Self-adhered peel-and-stick sheets and cold-applied adhesives skip the torch, which makes them common on houses.
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. Also mention any past coatings or cement patches, which the roofer will need to deal with.
Many modified bitumen roofing calls in Dumont also turn up a need for flat roof replacement or flat roof repair.
Need modified bitumen roofing in Dumont? Call (551) 374-2031 to talk to a local roofer.
Call nowThe process
The modified bitumen process
A mod bit roof goes on in layers, starting with a sound base.
Inspect the roof
Before planning, the roofer cuts a small sample to see what is underneath and checks for soft decking. With two roofs already in place or wet insulation present, a tear-off is the norm.
Prep the base
On a tear-off, everything comes down to the deck and damaged plywood or planks are replaced. Rigid insulation and tapered crickets go down next to improve drainage.
Lay the base sheet
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.
Apply the cap sheet
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.
Flash the details
Parapets and curbs are flashed with mod bit plies, then capped or counterflashed with metal. Drains get new flashing, and the roof edge gets new metal.
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
Drain flashing
Metal edges and flashed drain bowls to finish the system cleanly.
Base flashing
Two-ply flashing up walls and parapets so wall joints stay dry.
Insulation
New insulation where the roof is torn off to improve drainage and efficiency.
Base sheet
The first ply of polymer-modified asphalt that gives the roof its first line of defense.
Related service
Torch Down Roof Repair Dumont, 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. Loose granules are embedded in the bleed-out so the patch does not weather quickly.
In Dumont, 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 Dumont, 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 Dumont buildings with built up roofs, patching is done with felts or mod bit after the gravel is cleared. Replacement often means a tear-off, since the gravel and the weight make recovering difficult. 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 Dumont cover everything from older homes with flat sections to strip centers and churches. Homes and buildings in Dumont and around Haworth, New Milford, Bergenfield and Cresskill face summer sun, heavy rain and the occasional strong storm, all of which wear on cap sheets and laps, so the right method depends on what is up there now.
Need modified bitumen roofing around Dumont? Call (551) 374-2031 for a Dumont roofer who serves the towns around it too.
How the weather here affects roofs around Dumont
Winters here are long and cold, with snow on the roof for weeks at a time and plenty of nights below freezing. 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. Strong coastal storms push rain into every weak spot at the flashing and valleys. That is why roof repair in Dumont is busiest after a hard winter and before the next one.
Why call
Why act early
Smaller repairs
A roof problem fixed early rarely spreads to the decking, the insulation or the ceilings.
Local knowledge
Roofers in Dumont know the roof types and weather wear common in local homes.
Clear next steps
Ask your questions before you agree to anything.
Modified Bitumen Roofing questions
Can a mod bit roof be coated?
Modified bitumen takes coatings well when the cap sheet is sound and the roof drains. Before coating, the roofer repairs blisters and laps and may use a bleed-blocking primer. White coatings reflect sun, which helps the asphalt last.
Are torch-applied roofs a fire risk?
The open flame is the main concern with torch-down roofing. Safe practice includes not torching directly on wood, keeping extinguishers on the roof and watching for smoldering after the flame is off. Where flame is a concern, peel-and-stick sheets are a common alternative.
How long does a modified bitumen roof last?
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 use asphalt, but the plies and surfacing differ. 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 often preferred today for its flexibility and lower weight.
Can modified bitumen be installed over an existing roof?
The existing roof decides that. 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.
More questions? Call (551) 374-2031
Often needed together
Flat Roof Replacement
Replacing old built-up, torch-down, EPDM or TPO roofs with a new system built to drain, 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, after the real leak source is found, not guessed.
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
Looking for something else?
See all roofing servicesTalk to a Dumont roofer about modified bitumen roofing
Call (551) 374-2031 for a local roofer in Dumont and nearby towns.