Built-up Roofing Is A Time-tested, Flat Roofing Method

When it comes to your flat roof options, nothing is more time-tested than built-up roofing. Built-up roofing is a durable, proven option for your commercial building, and the experts at Sorensen Roofing & Exteriors, G.C. can give you the highest quality installation and repair services for your commercial roofing needs.

For a low maintenance, easy-to-repair, and reliable built-up roofing system, call us today at (970) 400-7663. We offer free estimates for all your roofing needs throughout the Greater Greeley area, as well as in most of Colorado and Wyoming.

Low Maintenance
Easy To Repair


Built-up roof membranes, otherwise known as BUR or “tar and gravel roofs,” are some of the oldest commercial roofing systems available, having been used in the United States for over 100 years. That being said, modern built-up roofing systems have adapted with the times and often incorporate an insulation layer that allows for improved energy efficiency within a commercial building.

These systems are mat up of alternating layers of reinforcing fabrics and bitumen to create a finished membrane. They are designed to be used on low-slope or flat roofs because of the continuous sealed surface it creates.



Proven and reliable option

BUR roofs have not been in use for over 100 years without good reason. Built-up roofs have proven their credibility by lasting for the long haul. In fact, a well-cared for BUR can have a lifespan of 40 years or more, living far longer than their expected service life.

Not many other commercial roofing materials can claim this level of proven reliability.

Low Maintenance Roofing Option

Reliability and the amount of maintenance required go hand-in-hand. Built-up roofing has fewer individual parts that need to be replaced, meaning there is less chance for damage.

On top of that, built up roofing is relatively easy to repair. This means if you see a blister, ripple, or cracks in the material, the affected section can easily be removed and patched. This will save you money in the long-term by avoiding expensive whole roof replacements.

Superior waterproofing and fire resistance

Thanks to the multiple layers of bitumen and saturated reinforcing fabrics, these roofs have great waterproofing. You can rest assured that your roof will protect your business against the harsh Colorado elements for years to come.

On top of that, BUR’s aggregate top layer makes it resistant to fire, which is always a huge bonus when it comes to protecting your commercial property. It also does well against strong winds.

Options for surfacing to reduce heat intake

Thanks to the special coatings on this roofing system that have high reflectivity values, you’ll have a consistent building temperature throughout. Let’s face it, commercial energy costs simply aren’t cheap, so you’re going to enjoy every bit of energy savings built-up roofs have to offer.

On top of that, your commercial HVAC unit will experience less strain from the amount of usage it takes to keep your building at inhabitable temperatures, meaning you’ll save over time on heating and cooling maintenance costs as well!


Modern flat roofing methods are single-layer membranes that are focused on reflecting UV rays. Built-up roofing offers superior reliability and waterproofing, and finishing options are available to improve UV resistance.

Additionally, the flexibility and ease of your roof’s installation means your company’s business won’t be interfered with while the long-term warranty gives you peace of mind.


Sorensen Roofing & Exteriors are experts in all aspects of commercial roofing, including installation, maintenance, and repair of all types of materials because your business depends on it.

We use the best products from top-of-the-line manufacturers to ensure that your commercial property gets the highest quality roof possible.

On top of that, our commercial roofing contractors actually take the time to get to know your business and your roofing needs, so we can make the best possible recommendation. That means, when it comes time to install a new commercial roof, you can be confident you’re getting a roof that works best for your business.

Call us at (970) 400-7663 for a free estimate today. We proudly service Denver, Colorado Springs, Littleton, Aurora, Arvada, Englewood, Boulder, Fort Collins, Longmont, Broomfield, and surrounding Colorado and Wyoming areas.