Built-Up Roofing (BUR) for Tulsa Commercial Buildings
Built-Up Roofing (BUR) for Tulsa Commercial Buildings
Built-up roofing has been on Tulsa commercial buildings for over a hundred years. The black tar smell that hung in the air around downtown construction sites for most of the 20th century — that was BUR going down on flat roofs, layer by layer, decade after decade. A lot of those original installations are still up there. Some are 60+ years old, still keeping rain out, still serving their buildings.
That’s an extraordinary track record, and it’s why BUR — also called “tar and gravel” or “asphalt built-up” — still has its place in commercial roofing in 2026, even as single-ply membranes have taken over most new construction.
This guide walks through built-up roofing in Tulsa: how it actually works, where it still makes sense, what it costs, and how to think about it relative to the modern alternatives. We’ll also cover what BUR maintenance and repair looks like for the many Tulsa-area buildings still operating on older BUR systems.
What Built-Up Roofing Actually Is
A built-up roof is exactly what it sounds like — a roof system literally built up from multiple layers, each adding to the strength and waterproofing of the whole.
The classic specification:
Base sheet — a fiberglass or organic felt mat fastened to the deck or insulation
Multiple plies of asphalt-saturated felt or modified glass-mat felts (typically 3-4 plies)
Asphalt or coal tar bitumen between each ply, applied hot or in cold-process adhesive
Surfacing — typically gravel embedded in a flood coat of asphalt, or modified surface materials
The result is a multi-redundant system. Even if the top layer is damaged, several more layers underneath maintain waterproofing. This redundancy is what makes BUR famously durable.
The two main bitumen types
Hot asphalt BUR — the traditional approach. Asphalt heated to 400°F+ and applied with mops between plies. Most common in Tulsa.
Coal tar BUR — uses coal tar pitch instead of asphalt. Better for very low-slope roofs or roofs with consistent ponding water (rare in our market). Less common today.
Cold-process BUR
A modern variant uses cold-applied adhesives instead of hot asphalt. Slower to install but eliminates the safety and odor issues of hot work. Used on buildings where hot work isn’t allowed (some industrial, food service, hospital settings).
Where BUR Still Makes Sense in Tulsa
In 2026, BUR is no longer the default for new commercial roofs in our market — single-ply has taken that title. But BUR remains the right answer in specific situations.
Heavy foot traffic roofs
The gravel surfacing on traditional BUR provides excellent walking protection. On roofs that get regular HVAC service, equipment access, or other foot traffic, the gravel layer protects the underlying membrane in a way that single-ply systems can’t match without separate walk pads.
Historical preservation
For buildings on the National Register or in historical districts where original construction matters, BUR may be the right or required match. Tulsa has several historic commercial buildings where this applies.
Specific industrial applications
Some industrial settings — chemical plants, certain manufacturing — have traditional BUR specifications that haven’t moved to single-ply. The proven performance and chemical compatibility of BUR remains preferred in these niches.
Repair and patching of existing BUR
Most BUR work in Tulsa now is repair, restoration, or partial replacement of existing systems. Many buildings have decades of life left in their BUR roofs with proper maintenance.
Owner familiarity and preference
Some Tulsa property owners and facility managers have decades of BUR experience and prefer to continue with the system they know. Familiarity with maintenance, repair, and inspection is real value.
Where BUR Doesn’t Make Sense
BUR has been displaced by single-ply for most new construction for good reasons:
Energy efficiency
BUR with traditional gravel surfacing has very low solar reflectance — typically SRI in the 5-15 range. White TPO can hit SRI 100+. In Oklahoma’s climate, the cooling cost difference over a 25-year roof life is substantial.
Modified BUR with reflective surfacing can improve this, but still typically lags single-ply reflective systems.
Speed of installation
BUR is slow. Multiple plies, between-ply asphalt application, surfacing, weather sensitivity — all add up. Single-ply membranes install much faster on equivalent buildings.
Weight
BUR with gravel surfacing weighs significantly more than single-ply systems — often 5-7 pounds per square foot vs 1-2 pounds for TPO/EPDM. This matters on buildings with marginal structural capacity, particularly older buildings or those with rooftop equipment additions.
Hot work restrictions
Many modern commercial environments restrict or prohibit hot work due to fire risk. Hospitals, data centers, food service, schools, and many industrial sites either ban hot work or require expensive permits and protections. Cold-process BUR exists but is slow and expensive.
Manufacturer warranty options
Single-ply systems have evolved sophisticated NDL (No Dollar Limit) warranty programs through major manufacturers. BUR warranty options exist but are more limited and typically shorter-term.
Aesthetics
For buildings with visible roofs (some retail, mixed-use), gravel-surfaced BUR looks utilitarian. White TPO or PVC has a more modern, intentional appearance.
Modified Bitumen as the BUR Alternative
For Tulsa commercial buildings considering BUR-like performance with some modern advantages, modified bitumen often hits a sweet spot.
BUR
4-5 layers
Typically gravel-surfaced
Hot or cold-applied
Heavier
Long-installed track record
Modified bitumen
2-3 layers
Various surfacing options
Hot, cold, or self-adhered
Lighter than BUR
More design flexibility
For many Tulsa buildings, modified bitumen captures most of BUR’s redundancy and durability advantages with faster installation and lower weight. It’s often the right answer when BUR-style performance is wanted but pure BUR isn’t ideal.
What BUR Costs in Tulsa
For 2026 Tulsa commercial roofing, BUR pricing typically lands:
New BUR installation: $10-$16 per sq ft fully installed
BUR over existing (where code permits): $8-$13 per sq ft
BUR repair (per area): Highly variable — $500-$5,000 for typical repair scopes
Coating restoration of aging BUR: $3-$8 per sq ft
Compared to alternatives:
BUR is typically slightly more expensive than EPDM ($6-$13/sq ft)
Comparable to or slightly more than TPO ($7-$15/sq ft)
Less expensive than PVC ($10-$18/sq ft)
Less expensive than standing seam metal ($14-$25+/sq ft)
For more detailed commercial roof cost analysis, see our pricing guide.
Maintaining an Existing BUR Roof
If you’re managing a building with an aging BUR roof — which describes many Tulsa-area commercial properties — proper maintenance can extend its life dramatically. Key practices:
Annual inspections
Walk the entire roof at least once a year, ideally twice (spring and fall). Looking for:
Cracking or crazing in the surface (alligatoring)
Bare spots where gravel has been displaced
Blisters in the membrane
Seam separation
Failed flashings at penetrations
Pooling water and inadequate drainage
Damaged or aged sealants at details
Regular debris removal
BUR roofs accumulate debris in the gravel — leaves, paper, dust, and biological growth. Periodic cleaning prevents debris-related drainage issues and reduces fire risk.
Re-graveling as needed
Over time, gravel migrates due to wind, foot traffic, and water flow. Bare areas of the underlying membrane lose UV protection and age faster. Re-graveling these areas (sometimes called “re-flooding”) restores the protective layer.
Flashing maintenance
The flashings around penetrations, at edges, and at wall transitions are typically the first failure points on aging BUR roofs. Annual sealant inspection and renewal extends overall roof life.
Repair before failure
Small issues addressed early prevent larger ones. A failed pipe boot caught and repaired in 30 minutes is dramatically cheaper than a failed pipe boot allowing months of water intrusion through a wet membrane.
Common Tulsa BUR Issues
Patterns we see in our market on aging BUR roofs:
Alligatoring
Cracking pattern that resembles alligator skin. Caused by the asphalt’s loss of plasticizers due to UV and aging. Indicates the surface is becoming brittle. Can often be addressed with restoration coating before it becomes a leak source.
Blistering
Air or moisture trapped between plies expanding under heat. Some blisters are cosmetic; some indicate underlying delamination that requires repair.
Granule loss / surface deterioration
The gravel surface migrating, separating, or being lost exposes the underlying membrane. Re-graveling or coating addresses this.
Flashing deterioration
The lead, aluminum, and modified bitumen flashings used in older BUR installations age out and require renewal. This is one of the most common BUR repair scenarios.
Edge metal failures
Where the membrane terminates at building edges, edge metal flashings and the underlying termination details fail with age. Repair requires careful integration with existing membrane.
Drainage issues
Original drainage often becomes inadequate as buildings settle, equipment is added, or maintenance is neglected. Drains clog, scuppers fail, and ponding develops in unintended areas.
When to Replace vs. Restore an Aging BUR Roof
The decision framework for Tulsa BUR roofs:
Lean toward restoration (coating) if
Membrane is structurally sound (no widespread blistering or alligatoring)
Insulation moisture survey shows mostly dry insulation
Drainage is functional
Penetrations and flashings are repairable
Building is being held long-term but not 25+ years more
Capital budget is constrained
Coating a structurally sound BUR roof can extend useful life 15-20 years for a fraction of replacement cost. Our commercial coatings guide covers this in detail.
Lean toward replacement if
Widespread membrane failure
Significant insulation moisture
Repeated repairs that haven’t held
Drainage cannot be corrected without major work
Building scheduled for major modifications
Long-term hold (25+ years) where investing in new system makes sense
How to Work With an Older BUR Building
If you’ve just acquired or started managing a Tulsa-area building with a BUR roof, here’s the practical sequence:
Get an honest condition assessment. A thorough walk by a contractor experienced with BUR — including moisture survey if appropriate — establishes the baseline.
Identify the system age. Original installation date, any subsequent re-roofs, current condition. Permit records sometimes help.
Determine the maintenance status. Has it been actively maintained? Are there warranty obligations? What repair history exists?
Develop a 5-10 year plan. Some combination of: maintenance program, targeted repairs, coating restoration, or planned replacement timing.
Budget for the plan. Include both immediate repair needs and long-term capital expenditure for eventual replacement.
This planning approach is much more cost-effective than reactive crisis management when leaks develop.
What Quality BUR Work Should Look Like
If you’re getting a quote for new BUR or significant BUR repair in Tulsa:
Specific scope — exactly which areas, exactly which work
System specification — number of plies, asphalt type, surfacing, fastener spec
Manufacturer compatibility — products that work together
Hot work plan — fire safety, permits, surrounding protection if hot asphalt is being used
Drainage verification — that drainage is being maintained or improved
Flashing details — comprehensive treatment at penetrations, edges, walls
Photo documentation plan — before, during, after
Manufacturer warranty terms if applicable
Workmanship warranty from the contractor
BUR work requires specific experience. Many roofers who handle single-ply don’t have current BUR skills. Verify the contractor’s specific BUR experience.
Get a Real Assessment of Your Tulsa BUR Roof
If you have a built-up roof on a Tulsa commercial property and you want a real assessment of where it stands — including condition, repair vs. restoration vs. replacement options, and a realistic plan for the next 10 years — schedule a free commercial roof inspection with our team.
We’ve worked on BUR roofs from the 1950s through to modern installations. Whatever your building’s situation, we can give you an honest assessment that respects both the legacy of the system and the practical realities of maintaining commercial property.
Built-up roofing has been keeping Tulsa businesses dry for a century. With proper care, your building’s BUR roof can keep doing the same for many years to come.
