What is TPO Roofing?

At Weather Shield Roofing Systems, we’ve been helping businesses protect their investments for over 40 years. If you’re researching commercial roofing options, you may have heard about TPO roofing. Today we’re answering your questions with clarity and practical insight — because we understand your concerns about cost, durability, and performance. 

What is TPO? 

TPO stands for Thermoplastic Polyolefin, a single‑ply roofing membrane made from a blend of polypropylene and ethylene‑propylene rubber. It typically comes in wide sheets (10’, 12’, or 20’) and is known for its bright white surface, which reflects sunlight and reduces cooling costs. 

Why is this important? 

• Energy efficiency: The reflective white TPO roof—often called a “cool roof”—helps lower HVAC expenses, especially during summer months. 

• Industry standard: TPO commands about 40% of the commercial roofing market, making it one of the most trusted and widely used systems available. 

What are the installation options and costs? 

Attachment methods

Mechanically fastened: Screws and plates secure the membrane. Ideal for fast installation and windy areas. 

Fully adhered: Adhesive bonds the membrane to the insulation or substrate. Preferred for aesthetics and enhanced uplift resistance. 

Ballasted: Held in place by stones or pavers. Less common for TPO because it disrupts reflectivity and adds weight. 

Insulation choices

Polyiso (polyisocyanurate): Offers the highest R-value per inch but comes at a higher price. 

EPS (expanded polystyrene) and XPS (extruded polystyrene): More affordable but with lower R-values. 

Existing roof substrate: May be reused with recover boards if in good condition. 

Cost factors

– Roof size and slope 

– Insulation type and thickness 

– Attachment method 

– Site accessibility and complexity 

– Local labor and material availability 

Generally, TPO is the most affordable single‑ply membrane and offers the best balance of performance and cost. 

What are the advantages of TPO?

• Cost-effective to install: Quick seaming and wide sheets reduce labor time and expense. 

• Strong seams: Heat-welded seams are stronger and more watertight than adhesive seams. 

• UV and weather resistance: Resists damage from sunlight, ozone, and chemical exposure. 

• Easy maintenance: Visual inspections and minor repairs are typically simple and affordable. 

• Eco-friendly: TPO membranes are recyclable and often manufactured without chlorine, making them a greener choice. 

What are the drawbacks of TPO?

• Seam vulnerability: Although heat-welded seams are durable, improper installation or aging can lead to separation and leaks. 

• Climate considerations: In colder climates, TPO’s reflective nature can increase heating needs in winter. 

• Lifespan: Typically lasts 15–30 years. Longevity depends on installation quality, material grade, and maintenance. 

• Limited long-term performance history: TPO has only been in wide use since the 1990s, so comparisons with older systems like EPDM or BUR are still developing. 

How can Weather Shield help extend your TPO roof’s lifespan?

Inspection & early detection

We perform comprehensive roof surveys using thermal imaging and moisture scans to detect hidden issues in seams, flashings, and insulation layers. 

Proactive maintenance

• Regular debris removal and drainage checks to prevent ponding. 

• Seam inspections using infrared and membrane testing. 

• Preventative service through our Max Life Roof Care program, designed to catch small problems before they become expensive repairs. 

Restoration vs Replacement

• If less than 25% of insulation is wet or damaged, we can restore the roof using coatings and overlays, minimizing disruption and cost. 

• If more than 25% is compromised, a full replacement may be needed to preserve building integrity and prevent further moisture damage. 

Coating upgrades

Adding reflective coatings (silicone, acrylic, or urethane-based) can: 

• Reinforce seams 

• Improve waterproofing 

• Boost UV protection and energy efficiency 

• Add 10+ years to your roof’s life expectancy 

How do you repair or restore a TPO roof?

Detailed roof survey: We check the entire roof system, identifying trapped moisture, failed seams, and substrate damage. 

Wet insulation removal: Eliminating compromised insulation is crucial to prevent blistering and mold. 

Power washing: We clean the roof surface at pressures above 2,500 psi to prepare for coating or overlay. 

Adhesion testing: Determines whether primers or surface treatment is needed for optimal product performance. 

Seam reinforcement: Taping or fabric embedding in coatings protects vulnerable areas. 

Full roof coating: Adds a waterproof, reflective layer that restores performance and extends lifespan. 

FAQs you may also be asking

How long does a TPO roof last?

Typically 15 to 30 years. Regular inspections, cleaning, and timely repairs can significantly extend this range. 

Is TPO better than EPDM or PVC?

• TPO vs EPDM: TPO has stronger seams due to heat welding. EPDM relies on adhesives and is more prone to seam failure. 

• TPO vs PVC: TPO is more affordable and eco-friendly, while PVC has a longer track record and higher chemical resistance. 

Can I add insulation to an existing TPO roof?

Yes. During a reroof or overlay, we can enhance insulation by adding polyiso or other board systems to improve thermal performance and meet updated building codes. 

We understand the pressures commercial property owners face—balancing upfront costs, long-term performance, energy savings, and peace of mind. At Weather Shield Roofing Systems, our goal is transparent, cost-efficient solutions built on practical knowledge. 

Ready to discuss your TPO roof needs? We’d be glad to assess your facility, provide clear insights, and help protect your roof investment from day one. Contact us today to get started!