Built-Up Roofing (BUR) & Modified Bitumen Systems
Multi-ply asphalt systems for older commercial, churches with complex geometry, and industrial buildings where puncture resistance matters more than reflectivity. LA CL69991 · 5-year transferable workmanship warranty.
Built-up roofing and modified bitumen are the workhorse systems on older South Louisiana commercial — the strip retail built in the 1980s, the churches with complex roof geometry that single-ply can't easily detail, the light-industrial buildings where puncture resistance matters more than reflectivity. The systems are well understood, the failure modes are predictable, and on the right building they outperform single-ply by 5–10 years of useful life.
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Epic Roofing installs, repairs, and re-roofs BUR and modified bitumen across the Northshore and Greater South Louisiana market. Joey Noto's decade of pre-Epic commercial work included full BUR tear-offs and mod-bit installs on older Baton Rouge commercial — the expertise on these systems is on the crew.
Why BUR / Modified Bitumen for Your Building
Puncture resistance over reflectivity
Single-ply membranes are thin (60–80 mil typical) and vulnerable to dropped tools, foot traffic from HVAC service, and debris impact. Multi-ply BUR and modified bitumen run thicker, with redundant plies that survive punctures better. Best for: industrial roofs with regular service traffic, low-rise commercial in tree-line or storm-debris zones.
Complex roof geometry detail
Churches with steeples, towers, and changing pitch lines. Older commercial with multiple additions and varying parapet heights. Modified bitumen flashes complex geometry better than single-ply — heat-welded laps follow the roof's actual shape, where single-ply prefers flat planes.
Established failure-mode diagnostics
BUR and mod-bit have been installed for decades, and the failure modes are well mapped — ply separation at seams, surface cap-sheet UV degradation, parapet flashing failure, ponding-related blistering. Repair scopes are predictable.
Cost-competitive for the right scope
On smaller commercial scopes (under 10,000 sq ft) and on buildings with complex geometry, BUR and mod-bit price competitively against single-ply when the comparison includes flashings, terminations, and warranty term.
The Epic BUR / Mod-Bit Install Process
Site walk and scope
Drone imagery, deck-level inspection, moisture probes where access allows, existing-membrane manufacturer identification where possible. The bid scope includes ply count, manufacturer system, surface treatment (granule cap-sheet, smooth, flood-and-gravel), and warranty term.
Surface prep and dry-in
Existing membrane removal for full tear-off, surface prep, deck inspection, repair of rotted structural deck. Vapor retarder where required, insulation laid to manufacturer-spec R-value.
Multi-ply install
Torch-down modified bitumen — base sheet, modified bitumen plies fused with controlled torch heat. Self-adhered modified bitumen for fire-restricted environments where torch work is prohibited. Traditional BUR — multiple felt plies adhered with hot asphalt or cold-process adhesive, finished with flood coat and aggregate or granule cap sheet.
Flashings and terminations
Parapet flashings, penetration boots, edge-metal terminations, drain transitions per the manufacturer's NDL detail. Complex roof geometry where single-ply struggles is where BUR and modified bitumen earn their cost.
Punch-list, manufacturer inspection, owner packet
Close-out walk, manufacturer warranty inspection where required, photo log delivery, owner packet with as-built drawings and warranty documentation.
BUR / Mod-Bit Repair Scopes
Lap and seam repair
Lap separation on torch-down, cold-process adhesive failure, surface cap-sheet damage — repaired with manufacturer-matched modified bitumen and new surface treatment. Includes new flood coat and granule embedment on BUR repairs to maintain UV protection.
Parapet flashing repair
A common failure point on BUR and modified bitumen. Repaired with new manufacturer-matched membrane up the parapet wall, termination bar reset, and counter-flashing where required.
Penetration boot replacement
Pre-formed boots or custom-flashed details on pipes, conduit, and HVAC penetrations. Detailed to match the original system specification.
Surface restoration / granule re-embedment
UV-degraded cap sheet where the surface granules have worn away can be restored with new flood coat and granule embedment, extending service life without a full re-roof scope. See also coating & sealing for extend-life options on BUR.
Choosing Between the Systems
- Why some buildings still get BUR or modified bitumen first. Single-ply has displaced multi-ply on the majority of new commercial — but churches with steeples and changing pitches, low-rise industrial in tree-line debris zones, and older commercial where the existing membrane is mod-bit (and recover is the right scope) still favor multi-ply. We don't push single-ply on buildings where multi-ply is the better fit.
- Modified bitumen vs. traditional BUR. Mod-bit: faster install, fewer plies, lower labor cost, slightly shorter service life on the right building. Traditional BUR: longer install timeline, more plies, longer real-world service life on industrial and historic commercial, requires periodic surface restoration. For new-construction commercial under 15,000 sq ft, mod-bit usually wins on cost-of-ownership math; for larger industrial or historic projects, traditional BUR sometimes makes sense.
- Photo-doc matters more on multi-ply. The lap pattern, ply orientation, and surface treatment all carry warranty implications. Daily CompanyCam logs document the ply sequence, lap dimension, and surface treatment for the warranty file.
- Single-source manufacturer responsibility. Mod-bit and BUR manufacturers offer single-source warranty programs covering both materials and labor when the installer is authorized — meaningful coverage that standard material-only warranties don't provide, and what facility managers want for accountability if a claim comes up.
- Fire-rating and smoke-tightness compliance. Class A fire-rating compliance is available on both BUR and mod-bit system specifications. Smoke-tightness requirements for buildings near fire-exposure boundaries get documented in the system submittal with manufacturer testing documentation.
- Tear-off logistics. Multi-ply tear-offs generate more waste than single-ply — multiple asphalt-saturated plies plus surface aggregate or granule cap sheet. We coordinate dumpster placement and tear-off scheduling against tenant impact and weight-load limits on the parking lot. Dump fees and tear-off labor are line-itemized.
Cost Context
Complex-geometry roofs — churches, older commercial with multiple additions, low-rise industrial — often price competitively against single-ply when the comparison includes the flashing and termination scope. Single-ply struggles to detail complex geometry; the additional labor and material on single-ply flashings closes the cost gap.
BUR / Modified Bitumen FAQs
Is BUR or modified bitumen better for my building?
Depends on roof geometry, traffic load, and budget. Mod-bit handles complex geometry better and installs faster. BUR delivers longer service life on the right building with proper maintenance. The bid walk will compare both options against your specific roof.
Can you do torch-down on an operating commercial building?
Torch-down has fire-safety requirements that not every site supports. We use self-adhered modified bitumen on fire-restricted environments where torch work isn't permitted. The bid will specify which method we recommend based on your site.
How long does a mod-bit install take?
A 10,000 sq ft modified bitumen install typically runs 5–7 working days from tear-off through close-out, depending on system complexity and weather.
Do you handle BUR repair on a roof you didn't install?
Yes — most of our BUR repair work is on systems installed by other contractors years ago. We identify the original system as best we can and use manufacturer-matched repair materials.
Is modified bitumen reflective?
Granule-surfaced modified bitumen comes in lighter cool-roof granule options that meet some energy-code reflectivity requirements. Smooth-surfaced modified bitumen is dark and doesn't meet reflectivity requirements without a top-coat application.
What's the warranty?
Manufacturer material warranty of 15–25 years depending on system and ply count. Our 5-year transferable workmanship warranty covers the install.
Request Your BUR or Modified Bitumen Bid
Older commercial, church, or industrial roof — we'll scope BUR, modified bitumen, and single-ply alternatives so you can compare.
Epic Roofing, LLC · 137 Girod Street, Suite 3, Mandeville, LA 70448 · jnoto@builtbyepic.com
LA Commercial CL69991 (exp. 4/30/2027) · LA Residential RL886377 · Fully Insured · More on commercial roofing, TPO, and EPDM