Built Up Roofing in Providence, RI

Built-Up Roofing for Rhode Island's Flat Commercial Roofs

Built-up roofing, the layered tar-and-gravel system most people picture when they think of a flat commercial roof, has protected New England buildings for well over a century, and it is still one of the toughest, most redundant low-slope systems made. A built-up roof, or BUR, is assembled on site from multiple alternating plies of reinforcing felt and bitumen, built up into a thick, monolithic membrane and finished with a protective surfacing. We install, repair, and replace built-up roofs on commercial and institutional buildings throughout Rhode Island, and we maintain a great many of the original BUR roofs already in service across the state's older building stock.

How a Built-Up Roof Is Constructed

The strength of BUR comes from redundancy. Where a single-ply membrane is one layer, a built-up roof is many, so no single flaw exposes the building.

• Insulation and cover board. Rigid insulation is laid over the deck to meet the building's thermal needs, topped with a cover board that gives the membrane a firm, even base.
• Base and ply sheets. Multiple plies of reinforcing felt or fiberglass are laid in overlapping courses, each one bedded in bitumen so the felts and the bitumen bond into a single mass.
• Bitumen. Hot asphalt, or a cold-applied adhesive where open flame and kettles are not appropriate, is mopped or applied between every ply to waterproof and bind the assembly.
• Surfacing. A flood coat of bitumen with embedded gravel, a mineral cap sheet, or a reflective coating protects the membrane from sunlight, weather, and foot traffic.

The result is a thick membrane with multiple independent waterproofing layers. If one ply is nicked or weathered, the plies beneath it still hold water out. That built-in margin is a large part of why BUR roofs routinely last for decades and why so many are still on the job long after they were installed.

Why BUR Still Earns Its Place in Rhode Island

This is hard country for a flat roof, and BUR was built for exactly these conditions. Winter snow piles up and sits on low-slope roofs for weeks, and a heavy, redundant multi-ply membrane shrugs off that sustained load and the foot traffic that comes with snow removal far better than a thin single layer. The relentless freeze-thaw cycle that pries at every flat roof all winter is met by a thick membrane with no field seams to split open. Nor'easters drive rain and wind across exposed roof fields, and a gravel-surfaced BUR resists that wind-driven assault and the abrasion that comes with it. The gravel and mineral surfacing also shields the bitumen from the ultraviolet light that ages every roof, lengthening service life.

That durability is why built-up roofing is woven through Rhode Island's commercial inventory. The dense nineteenth-century textile-mill buildings of Pawtucket, Woonsocket, and West Warwick carry vast low-slope roofs, and built-up systems have long been the workhorse over that kind of large, heavily used roof field. Downtown Providence and the hospital district are full of institutional and mid-rise buildings where the proven longevity and fire resistance of BUR have made it a default for decades. When those aging roofs finally need attention, a building owner often gets the best value by staying with the system the structure was designed around.

Repair, Restoration, or Replacement

An old built-up roof rarely fails all at once, which means you usually have options short of a full tear-off, and we will tell you honestly which one your roof has earned.

Diagnosis first

We start by finding out what is actually happening inside the assembly. Trapped moisture, blisters, ridging, alligatored surfacing, and failed flashings each tell a different story, and a moisture survey shows us whether water has reached the insulation. A BUR roof with dry insulation and localized surface problems is a very different project from one that is saturated through.

Targeted repair and surface restoration

Where the membrane is fundamentally sound, we repair the specific failures: cutting out and rebuilding blistered or split areas, renewing flashings at curbs, drains, and parapets, and re-establishing the gravel or surfacing. On a weathered but dry roof, a reflective coating can renew the surface, add waterproofing, and extend service life without the cost and disruption of replacement.

Full replacement

When the insulation is wet or the membrane is at the end of its life, we tear off down to a sound deck, correct the deck and drainage, and install a new system. That may be a fresh multi-ply BUR, or a modern modified-bitumen or single-ply assembly where it better fits the building, sequenced so each day's tear-off is made watertight before we leave the roof.

Flashings, Drainage, and the Details That Decide a Flat Roof

On a low-slope roof, leaks almost never start in the open field of the membrane. They start at the edges and transitions, the base flashings where the roof turns up a parapet, the drains and scuppers, the pipe penetrations, and the equipment curbs. We give those details the attention they deserve, because a built-up roof field can be flawless and still leak if a single flashing is wrong. Drainage gets the same focus: positive slope to the drains keeps water moving off the roof, which on a Rhode Island roof is the difference between a clear roof in January and a sheet of ponded ice working its way through the membrane.

Hot, Cold, and Working Over Occupied Buildings

Traditional built-up roofing is installed with hot asphalt heated in a kettle, and on the right building with the right access that is still an excellent, economical method. But hot work is not appropriate everywhere. Over an occupied hospital, school, or office where odor and fumes cannot drift inside, near sensitive air intakes, or on a tight downtown roof in Providence with no room to stage a kettle, a cold-applied built-up system uses adhesives that go down without open flame or a fume plume. We match the method to the building, the occupancy, and the site, and where a project calls for it we use cold-applied or modified-bitumen assemblies that deliver the same multi-ply redundancy without the constraints of hot work. Fire safety and the protection of the people working below the roof drive that decision every time.

BUR Compared With Modern Alternatives

Built-up roofing is not the only way to cover a flat roof, and part of our job is helping owners weigh it honestly against single-ply and modified-bitumen systems.

• Redundancy and toughness. BUR's multiple plies give it a margin of safety and a resistance to punctures and traffic that a single-ply membrane cannot match, which is valuable on roofs that see frequent foot traffic or rooftop equipment service.
• Proven longevity. A well-built, well-maintained built-up roof has one of the longest track records of any low-slope system, which is exactly why so many of Rhode Island's older buildings still carry their original BUR decades on.
• Reflectivity options. A bare gravel BUR is not reflective, but a mineral cap or a reflective coating can give a built-up roof a bright, energy-saving surface, narrowing the gap with white single-ply membranes.
• Weight and structure. BUR is heavier than single-ply, so on some buildings the structure or the project goals point toward a lighter system, and we will say so rather than oversell the roof we happen to be discussing.

The right system depends on the building, not on a preference. For many of the large, hard-used roofs across Rhode Island's industrial and institutional stock, built-up roofing remains the most durable and sensible choice; for others, a modern membrane fits better, and we are equipped to install either.

Schedule a Built-Up Roof Assessment

If your building carries an aging built-up roof, or if you are weighing a repair against a full replacement, the right answer depends on what we find when we open up the assembly and survey it for moisture. We will inspect the roof, tell you straight whether it needs a repair, a restoration, or a tear-off, and lay out a plan that fits the building and the budget. Reach out to schedule a built-up roof assessment anywhere in Rhode Island.