Drain flashing
Metal edges and flashed drain bowls so water leaves the roof where it should.
Flat Roofing
Modified Bitumen Roofing Denville, NJ
A roofer in Denville 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) 421-0116 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. 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. 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. 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. Say whether the roof has been coated or patched before, because old coatings and mastic affect repairs.
If the problem goes deeper than it first looked, a Denville roofer may also recommend flat roof replacement or flat roof repair.
Dealing with this in Denville, NJ right now? Call (862) 421-0116 to reach a nearby roofing contractor.
Call nowThe process
What a mod bit roof job involves
Each layer of a mod bit roof has its own job.
Survey the existing roof
Before planning, the roofer cuts a small sample to see what is underneath and checks for soft decking. Those findings decide whether the old roof must come off.
Prep the base
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.
Lay the base sheet
The first ply is nailed or mechanically fastened on wood, or set in adhesive over insulation. Its laps are staggered from the cap sheet laps to avoid weak lines.
Lay the top ply
The top ply goes on with the chosen method, granules facing up for sun protection. At torched laps, a small bead of melted asphalt should show along the edge, a sign the seam has fused.
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
After torch work, a fire watch confirms no hidden heat remains in insulation or wood. The last step is a full walk to confirm laps and flashings are sealed.
What is included
Parts of a modified bitumen roof
Base ply
A smooth reinforced base sheet over a clean, sound deck.
Wall flashing
Reinforced plies at every wall and curb so wall joints stay dry.
Cap sheet
The finished top layer with protective granules that takes foot traffic well.
Insulation
New insulation where the roof is torn off to improve drainage and efficiency.
Related service
Torch Down Roof Repair Denville, NJ
On a torch-down roof, most repairs involve resealing laps, cutting out blisters and adding new plies over damaged areas. A blister is cut in an X or cut out, the area is dried and sealed, and a new piece of cap sheet goes over it. Loose granules are embedded in the bleed-out so the patch does not weather quickly.
In Denville, 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 Denville, NJ
Built up roofing stacks three or more plies of felt and bitumen into a thick, heavy membrane, finished with a layer of gravel. Bare patches without gravel age quickly in the sun and are often where leaks begin. They are durable, but they show their age at the flashings and in blistered or bare areas.
For Denville 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 Denville, modified bitumen is common on low-slope roofs that see foot traffic or need a tough surface. Across Denville and nearby towns like Rockaway, Mountain Lakes, Morris Plains and Dover, older buildings may still have built-up roofs under a layer of mod bit, which is why the core cut matters, and the first step is finding out how many layers are already on the deck.
Need modified bitumen roofing around Denville? Call (862) 421-0116 for a Denville roofer who serves the towns around it too.
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 Denville, NJ have the roof checked in the fall and again after the snow melts.
Why call
Why act early
Smaller repairs
Small roof problems caught early usually stay small repairs.
Familiar with local homes
Local roofers see the same roofs and storm damage across Denville and nearby towns.
Know what happens next
Ask your questions before you agree to anything.
Common questions about modified bitumen roofing
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. A reflective coating applied before the cap sheet wears out can extend its life.
Is torch-down roofing safe?
Torching uses an open flame, so it carries a real fire risk that has to be managed. Safe practice includes not torching directly on wood, keeping extinguishers on the roof and watching for smoldering after the flame is off. Self-adhered sheets give the same kind of roof without a torch.
Can modified bitumen be installed over an existing roof?
What is already up there sets the answer. A single existing roof that is dry and well attached can sometimes be recovered. If there are already two roofs, blistering throughout or wet insulation, a tear-off is the right move.
Can a mod bit roof be coated?
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. A white coating also lowers roof surface temperatures in summer.
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. Mod bit is often preferred today for its flexibility and lower weight.
More questions? Call (862) 421-0116
Other services that may help
Flat Roof Replacement
Tearing off or recovering a worn flat roof and installing a new membrane, insulation and edge metal, so ponding and repeat leaks end for good.
Learn moreFlat Roof Repair
Flat roof repairs matched to the membrane, whether EPDM, TPO, PVC, modified bitumen or built-up, with the patch made from material that bonds to what is there.
Learn moreTPO Roofing
TPO membrane roofs installed over new insulation or in place of a worn flat roof, 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 servicesNeed modified bitumen roofing in Denville, NJ?
Call (862) 421-0116 to talk to a roofer serving Denville, NJ.