BUR & Modified Bitumen Roofing in Central Texas

Not every roof needs shingles and not every flat roof needs the same system.

For commercial buildings, additions, covered patios, offices, churches, retail spaces, and other low-slope roof areas, two common asphalt-based options are BUR roofing and modified bitumen roofing. Both are designed to create layered protection where water drains more slowly than it does on a steep-slope roof.

At Summit Roofing, we help property owners understand the roof system before making a repair or replacement decision.

What Is BUR Roofing?

BUR stands for Built-Up Roofing.

It is one of the older low-slope roofing methods and is built in layers. A BUR system typically uses multiple layers of asphalt and reinforcing materials to create a durable roof membrane.

Think of it as a roof system that is “built up” in layers for strength, waterproofing, and long-term protection.

BUR may be considered for certain commercial or low-slope applications where a layered asphalt roof system makes sense.

What Is Modified Bitumen Roofing?

Modified bitumen roofing is also asphalt-based, but it is made in roll-style membrane sheets.

It was developed as a more flexible, modern version of traditional asphalt roofing systems. Modified bitumen can work well on low-slope areas because it provides a protective membrane surface while still allowing for layered installation.

Some modified bitumen systems are designed for commercial roofs, while others may be used on smaller low-slope areas like porches, garages, carports, and patio covers, depending on the roof design and manufacturer requirements. GAF notes some low-slope self-adhered systems are used on areas such as porches, garages, carports, and sheds.

BUR vs. Modified Bitumen: What’s the Difference?

The simplest way to understand it:

BUR roofing is built in multiple layers on the roof.

Modified bitumen roofing comes in manufactured membrane rolls that are installed in layers or as part of a specific system.

Both can be useful for low-slope roofing, but the right choice depends on the roof slope, drainage, existing roof condition, foot traffic, building use, budget, and long-term maintenance plan.

When These Roof Systems Make Sense

BUR and modified bitumen roofing may be considered for:

Commercial flat roofs
Office and retail buildings
Churches and community buildings
Low-slope roof sections
Covered patios and additions
Multifamily or light commercial properties
Roof areas where shingles are not the right fit

A low-slope roof needs more than a quick patch. It needs proper drainage, compatible materials, clean tie-ins, and a system that fits the building.

Summit Roofing’s Approach

We do not believe in guessing from the ground.

Before recommending BUR, modified bitumen, coating, repair, or replacement, Summit Roofing looks at the full roof condition, including drainage areas, seams, penetrations, flashing, ponding concerns, prior repairs, and signs of membrane aging.

Our goal is simple: help you choose the roof system that actually fits the building — not just the one that is easiest to sell.

Need Help With a Low-Slope or Flat Roof?

Summit Roofing serves Round Rock, Austin, Georgetown, Hutto, Cedar Park, Pflugerville, Leander, Taylor, and surrounding Central Texas areas.

Schedule a professional roof assessment and get clear guidance on whether BUR roofing, modified bitumen roofing, repair, or another low-slope roofing option is the best fit.

Call Summit Roofing: (512) 828-7663
Request a roof inspection: summitrooftexas.com

FAQ Section for SEO

Is BUR the same as modified bitumen roofing?

No. BUR, or built-up roofing, is installed in multiple asphalt-based layers. Modified bitumen is also asphalt-based, but it comes in manufactured membrane rolls.

Is modified bitumen good for flat roofs?

Modified bitumen is commonly used on low-slope roof areas, but the right system depends on slope, drainage, roof condition, and manufacturer specifications.

Can shingles be installed on a flat roof?

In most cases, shingles are not the right choice for flat or very low-slope roof areas because those roofs need membrane-style protection.

Does Summit Roofing repair commercial flat roofs?

Yes. Summit Roofing can inspect low-slope and commercial roofing systems in Round Rock, Austin, and surrounding Central Texas areas.