APP Modified Bitumen Roofing: What Gainesville Homeowners Should Know

If you have a flat or low-slope roof, there’s a good chance someone has recommended modified bitumen roofing—and specifically, APP membranes. Here at L&L Roofing & Construction in Gainesville, GA, we’ve installed and repaired these systems across North Georgia for years. They’re durable, cost-effective, and built to last when installed correctly.

But what exactly is APP modified bitumen? And is it the right solution for your home or commercial building?

Let’s break it down.

What Is APP Modified Bitumen?

APP stands for Atactic Polypropylene. It’s a type of plastic added to asphalt during manufacturing to create a more flexible, UV-resistant membrane. APP membranes are usually torch-applied and come in rolls—kind of like a thicker, more rugged shingle for low-slope roofs.

Key Benefits of APP Roofing:

• Excellent UV resistance

• Tough against cracking and aging

• Flexible and easy to work with during installation

• Can be applied over existing roofs in some cases

• Multiple surface options: smooth, granulated, or reflective

APP membranes are typically installed in one or two layers, using heat (torch-down method) or adhesive, depending on your roof structure and local code.

Why It Works for North Georgia Roofs

Flat or low-slope roofs in Georgia face intense heat, occasional hail, and heavy rains. APP membranes are a smart choice because:

• They hold up well under sun and thermal stress

• They resist ponding water better than many traditional systems

• They’re a good long-term investment with a lifespan of 15–25 years when properly maintained

For homeowners in areas like Gainesville, Buford, or Cumming with carports, porch roofs, or commercial buildings with minimal pitch, this system makes sense.

Installation Matters—A Lot

Here’s the deal: even the best roofing material can fail if it’s installed wrong. APP systems must be:

• Applied to a clean, dry, well-prepped surface

• Installed with proper flashing at edges, penetrations, and transitions

• Heated evenly during the torching process to avoid weak seams

At L&L Roofing, we follow manufacturer specs to the letter and use skilled installers—not just whoever's available that week. Because we believe in doing the right thing—even when no one’s watching.

Is It Better Than SBS or TPO?

Every roof is different. APP membranes are great for:

• Long-term UV exposure

• High foot traffic (granulated surface)

• Roofs without lots of movement (vs. SBS, which is more rubber-like)

On the other hand, TPO (thermoplastic polyolefin) might be better for energy savings or commercial buildings looking for white, heat-reflective roofing.

We’ll help you make the right call based on your roof, not a sales quota.

FAQs

How long does APP modified bitumen roofing last?
Typically 15–25 years with proper installation and maintenance.

Is torch-applied roofing safe?
Yes—when installed by trained professionals. We follow all fire safety codes and use fire blankets during installation.

Can APP roofing be repaired?
Absolutely. Small blisters, punctures, or seam issues can often be spot-repaired without replacing the whole system.

Can I install it over my old roof?
Sometimes. If the existing roof is smooth, dry, and structurally sound, APP may be layered on top. We'll inspect first to be sure.

Serving Gainesville and Beyond

Whether you're in Gainesville, Flowery Branch, Dahlonega, or Dawsonville, we're here to serve. Our faith-driven team has worked on homes, businesses, churches, and rental properties throughout the region.

We're proud of our reputation—built on honesty, craftsmanship, and relationships.

Ready to talk roofing? Call us today at (770) 874-0372 or schedule a free estimate.