If you’re exploring roofing options, chances are you’ve heard about Single-Ply Membrane Roofing—systems like TPO (thermoplastic polyolefin) and EPDM (ethylene propylene diene monomer) that have become some of the most widely used in commercial roofing. At Weather Shield Roofing Systems, we’ve been helping businesses choose the right roofing solutions for over 40 years, so we understand how confusing it can be to sort through the pros and cons. The more you know about what single-ply can (and can’t) do for your building, the more confident you’ll be in your investment.

What Makes Single-Ply Membrane Roofing Popular?

Does it have a proven performance record?

Yes. Both TPO and EPDM have been used on commercial roofs for decades. This long track record means there’s plenty of real-world data on how they stand up to different climates, foot traffic, and maintenance practices. A properly installed single-ply membrane can last 20–30 years, especially with proactive roof inspections and timely repairs.

Can I choose the insulation type I want?

Absolutely. Unlike built-up roofing or some metal systems, single-ply membranes are not manufactured with insulation attached. This gives building owners the flexibility to choose the insulation type and thickness that meets their specific energy goals. Common choices include:

• Polyisocyanurate (ISO): High R-value per inch, great for maximizing insulation without adding bulk.

• Expanded Polystyrene (EPS): Cost-effective and moisture-resistant.

• Extruded Polystyrene (XPS): Durable, moisture-resistant, and high compressive strength.

How Does Single-Ply Perform in Fire and Energy Efficiency?

Is it energy efficient?

Yes—depending on the membrane type. TPO’s bright white surface reflects sunlight, which can help reduce cooling costs in hot climates. EPDM’s dark surface, on the other hand, absorbs heat, which is beneficial in colder regions. Matching the membrane to your climate is an important part of maximizing energy savings.

What about fire safety?

Both TPO and EPDM can achieve Class A fire ratings when fire retardants are added during manufacturing. This can be important for meeting building codes and protecting your investment.

Is Installation Easy and Lightweight?

Can it work for retrofits?

Yes. Single-ply membranes are lightweight and flexible, making them a good option for retrofit projects where adding extra weight to the structure is a concern. The sheets are typically wide, which means fewer seams to seal and a faster installation process. They can be mechanically fastened or fully adhered to the insulation, depending on building needs and wind-uplift requirements.

What Are the Drawbacks of Single-Ply Membrane Roofing?

Is it prone to punctures?

This is one of the most common concerns. The membrane itself is relatively thin and can be punctured by hail, falling debris, or even regular foot traffic from maintenance crews. That’s why we recommend installing protective walkway pads in high-traffic areas to reduce the risk of damage.

Can seams cause problems?

Potentially, yes. Single-ply systems depend on heat-welded or adhesive-bonded seams. These seams, along with flashing around roof penetrations (like HVAC units or vents), can become weak points if not installed properly. Over time, UV exposure can break down adhesives, making proactive inspections especially important.

Does it have built-in insulation?

No. The membrane alone doesn’t provide insulation, so thermal performance depends entirely on the insulation boards beneath it. Adding higher R-value insulation improves energy efficiency but also increases the project’s cost.

What Are My Options at the End of Its Lifespan?

The good news is that reaching the end of a single-ply roof’s life doesn’t always mean tearing it off.

• Silicone Restoration Membrane System: If less than 25% of the insulation is wet and the seams are still solid, a silicone coating can extend the roof’s life while providing a new leak-free warranty.

• Spray Foam Roofing: If there’s significant moisture damage or failing seams, spray foam offers a seamless, high-R-value alternative that eliminates fasteners and seams entirely.

So, Should You Choose Single-Ply Membrane Roofing?

If you want a flexible, proven, and energy-efficient system, single-ply is worth serious consideration. But like all roofing systems, its success depends on expert installation and consistent maintenance. At Weather Shield Roofing Systems, we help building owners weigh the benefits and potential drawbacks of Single-Ply Membrane Roofing so they can protect their investment for the long haul. If you’d like to talk through whether this system is right for your property, we’re here to help.

Contact us to schedule a consultation and get straightforward answers about your commercial roofing options.