If you own a commercial building or rowhome in Philadelphia, chances are your roof is flat—or nearly flat. That makes it a perfect candidate for Built-Up Roofing (BUR), one of the oldest and most reliable flat roofing systems on the market. At Riley Roofing, we specialize in helping local property owners choose and install the right roofing system for their needs, and BUR continues to be a proven, cost-effective option.

What Is Built-Up Roofing (BUR)?

BUR consists of multiple layers of bitumen (asphalt or coal tar) alternated with layers of reinforcing fabric (typically fiberglass or felt). The top layer is usually finished with gravel or a reflective coating.

This multi-layered approach creates a:

• Water-resistant barrier
• Durable surface for foot traffic
• UV- and weather-resistant rooftop

✅ Proven durability – Many BUR systems last 20–30 years with proper maintenance.
✅ Excellent waterproofing – Multiple layers mean multiple levels of protection.
✅ Fire resistance – BUR systems are inherently fire-resistant with proper surfacing.
✅ Low maintenance – Gravel-top BUR can protect the membrane from UV and damage.

At Riley Roofing, we often recommend BUR for commercial properties, multi-family housing, and even larger rowhomes with flat roofs.

BUR is ideal for:

• Flat or low-slope roofs
• Large roof surfaces
• Buildings requiring high durability and load resistance

However, BUR may not be the best fit if:

• Weight is a concern (it’s heavier than single-ply)
• You need quick installation
• Your budget favors low initial cost over longevity
  

Work with Philadelphia’s Flat Roof Experts