EPDM roofing is a popular choice for commercial and low-slope roofs because it provides flexibility, weather resistance, and long-term performance. In Florida, however, roofing materials must withstand intense sunlight, heavy rain, high humidity, strong winds, and, in many areas, hurricane conditions. This makes membrane thickness an important consideration when selecting an EPDM roofing system.
What EPDM Thickness Is Best for Florida?
For most commercial roofing applications in Florida, 60-mil EPDM is a commonly recommended minimum thickness, while 75-mil or 90-mil EPDM may be appropriate for projects where greater durability, puncture resistance, or enhanced warranty protection is desired.
The Florida Building Code does not simply establish one universal EPDM thickness that applies to every building. Instead, the complete roofing assembly must meet applicable material, wind-resistance, installation, and product-approval requirements. Florida-approved EPDM systems are available in several thicknesses. For example, a Florida product evaluation for Versico EPDM systems lists 45-, 60-, and 90-mil non-reinforced membranes, as well as several reinforced options.
Therefore, choosing the appropriate thickness requires considering the building’s location, roof design, attachment method, expected traffic, and required wind performance.
Why 60-Mil EPDM Is a Popular Choice
A 60-mil EPDM membrane provides a useful balance between cost and durability. Compared with thinner membranes, it offers more material to withstand normal weathering, maintenance activity, and occasional foot traffic.
Florida’s climate makes this particularly valuable. Prolonged UV exposure, temperature changes, storms, and moisture can place significant demands on a commercial roof. A properly installed 60-mil system can provide dependable protection while remaining more economical than substantially thicker membranes.
However, thickness alone does not determine whether a roof will perform well. The quality of the membrane, seams, flashing, insulation, cover board, fasteners, adhesives, and installation all contribute to the finished system.
When Should You Consider 75- or 90-Mil EPDM?
A thicker membrane can make sense when the roof is exposed to demanding conditions. 90-mil EPDM, for example, can provide additional resistance to punctures and physical damage compared with thinner membranes.
Buildings with frequent rooftop maintenance, mechanical equipment, service traffic, or increased risk of accidental damage may benefit from a heavier-duty roofing assembly. Some manufacturers also provide enhanced warranty or hail-related options that require thicker EPDM systems. Elevate’s design guidance, for example, identifies 60-mil or greater EPDM for certain enhanced warranty applications and specifies minimum 60-mil adhered EPDM with an approved cover board for certain hail coverage.
Does Florida Require 60-Mil EPDM?
Not necessarily. It is important to distinguish between a recommended thickness and a code-mandated thickness. Florida roofing requirements depend on the specific roofing assembly and project conditions rather than simply requiring every EPDM roof to have one particular membrane thickness.
The current Florida Building Code framework includes requirements for roofing material standards and wind resistance. Florida-approved EPDM systems demonstrate compliance through testing and are subject to specific installation limitations.
Because Florida’s wind requirements can vary significantly by location and building characteristics, contractors should verify the applicable Florida product approval and the required roof assembly before installation.
Choosing the Right EPDM Thickness for Your Florida Roof
For many commercial projects, 60-mil EPDM is a strong starting point, while thicker 75- or 90-mil membranes may be worth considering when durability and long-term protection are higher priorities.
The best choice should be based on the entire roofing system—not membrane thickness alone. A qualified Florida commercial roofing contractor can evaluate the roof deck, insulation, attachment method, wind zone, drainage, rooftop equipment, maintenance traffic, and applicable product approvals.
Bottom line: For Florida commercial roofing, 60-mil EPDM is commonly recommended for a good balance of durability and cost, while 75- and 90-mil EPDM can provide additional protection for demanding applications. Always verify that the selected EPDM assembly meets the applicable Florida Building Code and product-approval requirements for the specific property.
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