Built-Up Roofing (BUR) for Tulsa Commercial Buildings

In this guide 12 sections

1. What Built-Up Roofing Actually Is
2. Where BUR Still Makes Sense in Tulsa
3. Where BUR Doesn’t Make Sense
4. Modified Bitumen as the BUR Alternative
5. What BUR Costs in Tulsa
6. Maintaining an Existing BUR Roof
7. Common Tulsa BUR Issues
8. When to Replace vs. Restore an Aging BUR Roof
9. How to Work With an Older BUR Building
10. What Quality BUR Work Should Look Like
11. Frequently Asked Questions About Built-Up Roofs
12. Get a Real Assessment of Your Tulsa BUR Roof

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

1. Hot asphalt BUR: the traditional approach. Asphalt heated to 400°F+ and applied with mops between plies. Most common in Tulsa.
2. 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, and our TPO vs. EPDM comparison covers the single-ply alternatives.

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:

1. Get an honest condition assessment. A thorough walk by a contractor experienced with BUR, including moisture survey if appropriate, establishes the baseline.
2. Identify the system age. Original installation date, any subsequent re-roofs, current condition. Permit records sometimes help.
3. Determine the maintenance status. Has it been actively maintained? Are there warranty obligations? What repair history exists?
4. Develop a 5-10 year plan. Some combination of: maintenance program, targeted repairs, coating restoration, or planned replacement timing.
5. 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:

1. Specific scope: exactly which areas, exactly which work
2. System specification: number of plies, asphalt type, surfacing, fastener spec
3. Manufacturer compatibility: products that work together
4. Hot work plan: fire safety, permits, surrounding protection if hot asphalt is being used
5. Drainage verification: that drainage is being maintained or improved
6. Flashing details: comprehensive treatment at penetrations, edges, walls
7. Photo documentation plan: before, during, after
8. Manufacturer warranty terms if applicable
9. 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.

Frequently Asked Questions About Built-Up Roofs

How long does a built-up roof last?

A well-maintained BUR roof commonly lasts 20 to 30 years, and some Tulsa installations have gone much longer. Re-graveling, flashing upkeep and a restoration coating can add years.

How much does a built-up roof cost in Tulsa?

About $10 to $16 per sq ft for new BUR in 2026, $8 to $13 where it can go over an existing roof, and $3 to $8 per sq ft for coating restoration.

Is BUR better than TPO?

BUR handles foot traffic and punctures better; TPO is lighter, faster to install, and far more reflective, which matters for Oklahoma cooling costs. For most new Tulsa buildings, single-ply wins.

What is alligatoring on a flat roof?

A pattern of cracks in aging asphalt that looks like alligator skin. It means the surface is getting brittle; caught early, a restoration coating can often address it.

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 commercial roofing team. Our commercial roof inspection checklist shows what we look at.

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.

Schedule Your Free Tulsa Commercial Roof Inspection →

Sources and disclaimer. Information in this article comes from manufacturer documentation, industry standards and RainTech’s own commercial roofing experience. It was current as of September 24, 2026; laws, insurance rules, manufacturer terms and prices change. This article is general information, not legal, insurance, tax or financial advice.