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What Is a Duro-Last Roofing System and Why Do We Recommend It?
If you're evaluating flat roof systems for a commercial property, you've likely come across three names: EPDM, TPO, and Duro-Last. They all go on low-slope and flat roofs. The difference in how they're manufactured and how they hold up over time is significant enough that the choice matters.
What Duro-Last Actually Is
Duro-Last is a brand, not a material category. It uses a PVC membrane, but what separates it from other single-ply products is how it's manufactured. Every system is custom-fabricated to the exact dimensions of a specific roof before it ships drain locations, curb flashings, penetration details, edge terminations. Up to 85% of the seam work is done in a controlled factory environment rather than in the field. Everything else about the system flows from that.
How It Compares to TPO and EPDM
TPO comes in rolls and is seamed together on the roof with a heat gun. It's less expensive upfront and performs well in many applications. The tradeoff is that all the seaming happens in the field, under whatever conditions exist that day. TPO also has a shorter track record; it came to market in 1991, while PVC membranes have been in use since 1966. At comparable thickness, the performance layer in TPO is thinner than Duro-Last's PVC membrane and the reinforcement scrim typically has a lower thread count.
EPDM is rubber, generally the least expensive of the three, and installed without heat welding. The drawbacks for most commercial buildings: it's primarily available in black, which absorbs heat and increases cooling costs, and it's less resistant to grease and chemical exposure than PVC.
What the Certification Means
Landmark is a certified Duro-Last installer. To maintain that certification, installers must complete a minimum number of warranted commercial jobs per year and score in the "outstanding" category on installation quality reviews conducted by Duro-Last's independent QA representatives. Every installation gets inspected and graded. A manufacturer warranty is only as good as the installation behind it, and that review process is part of what gives the Duro-Last warranty weight.
When We Recommend It and When We Don't
Duro-Last tends to be the right call for roofs with a high number of penetrations, buildings with rooftop kitchen exhaust or chemical exposure that would degrade EPDM, occupied buildings where installation disruption needs to be minimized, and owners who want a warranty with no exclusion for ponding water.
It isn't always the right fit. For smaller roofs with few penetrations and tight budgets, a quality TPO installation can perform well at lower cost. The prefabrication advantage matters less when a roof has two drains and no rooftop equipment. The right system depends on the building, the budget, and how long the owner plans to hold the asset and we'll tell you directly if something else makes more sense for your situation.
Getting a Free Assessment
If you're evaluating systems for a commercial property, we offer free inspections and estimates. We'll walk the roof, document conditions, and give you a recommendation with the reasoning behind it.
