Base ply
A smooth reinforced base sheet over a clean, sound deck.
Flat Roofing
Modified Bitumen Roofing Montvale, NJ
Modified bitumen roofing in Montvale is a multi-ply asphalt roof, usually a base sheet and a granulated cap sheet, used on flat and low-slope roofs, which holds up well to foot traffic and patches easily. Call (551) 390-0362 to reach a local roofer.
Modified bitumen, often shortened to mod bit, is the modern descendant of the old tar and gravel roof, with polymers added so the asphalt stays flexible. 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. The layers give it toughness, which is why it holds up well on roofs that see foot traffic.
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. 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.
Modified Bitumen Roofing is often paired with flat roof replacement and flat roof repair, depending on the cause.
Looking for Montvale modified bitumen roofing? Call (551) 390-0362 and describe the problem to a roofer who works in Montvale.
Call nowThe process
The modified bitumen process
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. Those findings decide whether the old roof must come off.
Prep the base
Old roofing is removed where needed, rotted decking is replaced and the surface is swept clean. Rigid insulation and tapered crickets go down next to improve drainage.
Install the base ply
A base sheet is fastened to wood decks or adhered to insulation and cover board. Laps are offset so seams in the cap sheet do not land on seams below.
Lay the top ply
The granulated cap sheet is torched, set in cold adhesive or self-adhered over the base. At torched laps, a small bead of melted asphalt should show along the edge, a sign the seam has fused.
Flash the walls
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
What a mod bit roof includes
Edge metal
Metal edges and flashed drain bowls set into the membrane plies.
Wall flashing
Flashing that runs up the wall and under metal where most flat roof leaks start.
Insulation
New insulation where the roof is torn off built to current code levels.
Cap sheet
The finished top layer with protective granules with fully sealed laps.
Related service
Torch Down Roof Repair Montvale, 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. Granules are pressed into any exposed asphalt so the patch is protected from sun.
Torch work on an occupied home in Montvale needs extra care, especially near wood fascia, siding and attic vents. Many roofers switch to self-adhered or cold-applied patches in tight spots where an open flame is a risk. After torching, a watch period for smoldering material is standard practice.
Related service
Built Up Roofing Montvale, 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. 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.
Repairs on a built up roof in Montvale usually involve scraping back the gravel, patching with felt and bitumen or modified bitumen, and replacing the gravel. 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
Around Montvale, mod bit replaced a lot of old tar and gravel roofs years ago, and many of those are now due for work. Homes and buildings in Montvale and around Park Ridge, Woodcliff Lake, Saddle River and Hillsdale face summer sun, heavy rain and the occasional strong storm, all of which wear on cap sheets and laps, so a check of laps and flashings every year or two catches small trouble early.
Searching for modified bitumen roofing near me from Montvale or Park Ridge, Woodcliff Lake, Saddle River and Hillsdale? Call (551) 390-0362 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. Strong coastal storms push rain into every weak spot at the flashing and valleys. Most homeowners in Montvale, 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 Montvale and nearby towns.
Know what happens next
Ask your questions before you agree to anything.
Common questions about modified bitumen roofing
What is the difference between modified bitumen and built up roofing?
Both are asphalt roofs built in layers, but they are made differently. 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.
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.
Should I coat my modified bitumen roof?
A coating can extend a modified bitumen roof that is aging but still dry and sound. Before coating, the roofer repairs blisters and laps and may use a bleed-blocking primer. White coatings reflect sun, which helps the asphalt last.
How long does a modified bitumen roof last?
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.
Are torch-applied roofs a fire risk?
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. On homes, self-adhered or cold-applied modified bitumen avoids the flame entirely.
More questions? Call (551) 390-0362
Often needed together
Flat Roof Replacement
Full replacement of failing flat roofs, with a moisture survey deciding tear-off or recover, with tapered insulation where water used to sit.
Learn moreFlat Roof Repair
Fixing open seams, blisters, splits, ponding and failed flashing on flat and low slope roofs, with the patch made from material that bonds to what is there.
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
Tear-off or recover of aging commercial roofs with new insulation and drainage, with nightly tie-ins to keep the building dry.
Learn more
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