Choosing a roofing membrane is a key decision that affects a commercial building’s protection and value. The popularity of TPO is attributed to its lightweight and energy-efficient properties. But membranes vary in thickness, and with that, in cost and durability.

Selecting appropriate TPO roofing thickness for buildings in Texas that are subject to extreme heat, rain, wind, and sometimes hail is crucial. Let’s compare the 3 options.

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What is TPO Roofing Thickness?

The TPO roofing thickness is measured in mils. One mil is equal to one-thousandth of an inch, thus an 80 mil membrane is thicker than an 80 mil membrane or a 45 mil membrane. Thicker membranes will typically offer greater puncture and wear resistance, but that is not the only factor to consider.

Other factors that impact durability include seam welding, flashing, drainage, insulation, and installation quality. When deciding on the TPO roofing thickness, take into account the requirements of your building and the manufacturer’s system requirements, not just what the label says.

45-Mil TPO: A Lower Cost Option

A 45 mil membrane may be suitable for commercial roofs with minimal foot traffic and simple roofing needs. It may be attractive for projects that have budget constraints.

Ideal for: Smaller buildings or offices with limited access to rooftops and infrequent maintenance.
Benefits: It is relatively inexpensive to purchase, and the membrane is lightweight enough to be used under some commercial roof systems.
Limitations: It usually has less material to resist punctures, abrasion, and repeated foot traffic than thicker materials.

If technicians need to regularly cross the roof to service HVAC units, consider installing a more durable membrane and protective walk pads.

60-Mil TPO: A Balanced Choice

A 60-mil membrane provides a middle ground between initial cost and durability. It’s often used in offices, retail spaces, warehouses, and other commercial properties that require reliable performance from their TPO commercial roofing system on a day-to-day basis.

Ideal for: Buildings that have moderate rooftop activity and typical maintenance requirements.
Benefits: Higher material content than 45-mil TPO and a convenient mix of cost and physical properties for many applications.
Limitations: It is more expensive than 45-mil and may not be suitable for roofs that are subject to frequent access or are in challenging service environments.

60-mil TPO is a logical initial choice for many owners. The roof layout, equipment, and installation requirements should still be reviewed by a contractor.

80-Mil TPO: Additional Material for Demanding Roofs

An 80-mil is the thickest among all the three options. Depending on the product and roofing system, its added material can provide better puncture and abrasion resistance.

Ideal for: Commercial roofs that are accessed frequently, have significant equipment on the roof, or are more susceptible to physical damage.
Benefits: Thicker membrane and extra protection in areas where roof access and equipment servicing is common.
Limitations: Cost is higher up front, which may not be warranted in all buildings.

For warehouses and industrial applications where there are several HVAC systems, consider an 80-mil option. The hailproofness of a membrane is not guaranteed by its thickness alone and cannot be remedied by adding more thickness if it has not been installed correctly, if the flashing was not installed correctly, or if the membrane has standing water.

Tips for Selecting the Right TPO Roofing Thickness for Your Building

Roof traffic: If employees are accessing equipment regularly, consider a thicker membrane and walk pads on high-traffic areas.
Exposure to weather elements: Texas roofs are exposed to strong sun, storms, wind, and sometimes hail. Consider product testing and manufacturer recommendations, not just thickness.
Cost and lifetime: Analyze costs of installation, future maintenance, repair, warranty, and lifetime service. The lowest initial cost might not be the most cost-effective for all buildings.
Installation and warranty: Seams, penetrations, and flashing should be properly installed. Select a competent contractor that will provide installation and warranty information.
Building codes: Wind-uplift ratings, fire requirements, insulation, and local codes determine suitable roofing systems for your property. Verify these before choosing a membrane.

Also Read: What Is a Commercial Roof Core Sample, and When Is One Needed?

Key Takeaways

45-mil: May be used on budget projects where not too much traffic will be carried on the roof.
60-mil: A realistic compromise for most commercial structures.
80-mil: To consider where frequent access and physical wear are issues.
Don’t just consider thickness; drainage, installation, and maintenance are all factors that affect roof performance.
Compare total value: Take into account long-term costs and warranties, not just the price.

Summary

The right TPO roofing thickness depends on your building’s rooftop activity, budget, exposure to weather, and needs of your roofing system. A 45-mil membrane may be sufficient for a simpler roof, a 60-mil membrane may be a good compromise, and an 80-mil membrane may be appropriate for more challenging conditions. A professional evaluation can help you select the right protection without paying for what your building doesn’t need.

Contact Us to Understand More About TPO Roofing

Looking for a TPO roofing solution for your business? Call 911 Commercial Roofing to discuss your building’s requirements and different membrane options for a long-lasting roofing solution suitable for Texas weather.