COMMERCIAL ROOF SYSTEMSCOMPARED HONESTLY
Most system comparisons online are written by a manufacturer or a contractor who installs one thing. L&M installs them all — TPO, EPDM, modified bitumen, built-up, PMMA liquid-applied, and hot fluid-applied — so our answer to “which system is best?” is the honest one: it depends on your building, your budget horizon, and what sits on top of the roof.
Here is the short version we give property managers and boards, based on five decades of installing and repairing every one of these assemblies across NYC and the tri-state area.
THE SYSTEMS, SIDE BY SIDE
Single-ply membranes: TPO is a white, heat-welded membrane — reflective, economical, and a strong fit for large open roofs where cooling costs matter; expect roughly 20–30 years from a well-installed assembly. EPDM is black synthetic rubber with decades of proven field history, excellent in freeze-thaw climates and simple to repair, typically 25–30+ years. Asphaltic systems: modified bitumen is a multi-ply, redundant membrane that tolerates foot traffic and penetrations well — a workhorse on NYC multifamily and institutional roofs, 20+ years. Built-up (BUR) assemblies remain among the most durable and puncture-resistant choices for roofs that get service traffic, commonly 20–30 years.
Liquid-applied: PMMA systems (we are Siplast Parapro certified) install cold with no open flame, conform to complex details, and are increasingly specified for occupied-building reroofing by NYC agencies. Hot fluid-applied rubberized asphalt (American Hydrotech) is the premium fully-adhered, monolithic membrane used beneath green roofs, plazas, and amenity decks, with service lives that can run decades when protected. The honest rules of thumb: occupied buildings and tight logistics favor cold-applied and PMMA; green roofs and amenity decks favor hot fluid-applied; large open industrial roofs favor single-ply; and heavily trafficked roofs favor multi-ply asphaltic systems. Spec, insulation, drainage, and installation quality matter more than the brand on the roll.
EXPLORE THE SYSTEMS WE INSTALL
Why the Installer Matters More Than the Membrane
Every system on this page fails the same way: at the details. Flashings, penetrations, terminations, and edge metal cause the overwhelming majority of leaks — not the field membrane. L&M self-performs the membrane, the insulation, and the metal with our own crews and our own fabrication shop, and we hold certifications with Siplast, American Hydrotech, and GAF. One installer, one warranty conversation, one accountable party — on more than 1,000 projects since 1970.
SYSTEM SELECTION FAQS
Which commercial roof system lasts the longest?
Protected membranes last longest: hot fluid-applied rubberized asphalt under a green roof, pavers, or overburden can serve for decades because the membrane never sees UV or foot traffic. Among exposed systems, well-installed EPDM, BUR, and multi-ply modified bitumen assemblies routinely reach 25–30 years. Installation quality and detailing drive the real number.
Which system is most economical?
On large, open roofs, TPO usually wins on installed cost per square foot. On smaller NYC roofs with many penetrations, the mobilization and detail work dominate cost, and multi-ply or liquid-applied systems often price competitively while handling the complexity better. We price the options against each other on request.
What is best for an occupied building in the city?
Cold-applied and PMMA liquid-applied systems — no open flame, low odor options, and phased installation. This is why NYC agencies increasingly specify PMMA for occupied-building reroofing, and why we maintain Siplast Parapro certification.
Do you recommend one system over the others?
No single system wins every building. We install all of them, so our recommendation follows the building: its structure, use, logistics, code obligations like Local Laws 92/94, and how long the owner intends to hold it. Call (914) 937-1030 and we will lay out the honest trade-offs for your roof.
NOT SURE WHICH SYSTEM FITS?
MBE Certified · Self-Performed · Serving NYC Since 1970