EPDM Roofing - Installation, Repair, and Recover

EPDM is the right membrane choice for Atlanta commercial applications where high interior humidity, chemical vapor exposure, or fully adhered installation is the priority. We install and repair EPDM on industrial buildings, cold storage facilities, food processing plants, and buildings where the membrane has to hold up against what is happening inside the building, not just the Atlanta weather outside it.

EPDM - ethylene propylene diene monomer - is a synthetic rubber membrane that has been in commercial roofing service since the 1970s. It is not the dominant membrane in Atlanta's current commercial market - that position belongs to TPO - but it remains the correct specification for a specific subset of Atlanta commercial buildings where TPO's characteristics are a disadvantage. Understanding the difference between those situations and the general commercial market is the starting point for any honest EPDM recommendation.

Atlanta's climate creates one specific condition where EPDM frequently outperforms TPO: buildings with high interior relative humidity. Food processing facilities, commercial laundries, textile finishing operations, and cold storage buildings generate interior vapor pressure that drives moisture through the roof assembly from inside to outside. In these buildings, fully adhered EPDM with a proper vapor retarder assembly limits vapor drive into the insulation stack more effectively than mechanically attached TPO, because the fully adhered attachment eliminates the vapor pathway that fastener penetrations create. The Gwinnett and Cobb County industrial corridors have significant concentrations of these building types.

EPDM also remains common in Atlanta's existing building stock - particularly industrial and warehouse buildings from the 1980s and 1990s that went in on large-sheet EPDM before TPO's dominance in the market. These buildings are now in active repair or replacement cycles. The Marietta manufacturing corridor near Dobbins Air Reserve Base and the Sandy Springs older office market both carry meaningful EPDM inventories from this era that we inspect and repair as part of our regular routes.

Fully adhered EPDM: The installation method of choice for Atlanta's high-humidity interior applications. Membrane bonded to the substrate with EPDM-compatible bonding adhesive on both the insulation cover board and the membrane underside. Fully adhered installation eliminates wind-induced membrane flutter that can fatigue seams on mechanically attached systems, and it provides maximum resistance to vapor drive by eliminating the air pathway between the membrane and substrate. Atlanta's summer humidity creates application timing constraints - most EPDM bonding adhesives require surface temperatures above 40 degrees and below 95 degrees, and the adhesive must be applied to a dry surface. Our crews monitor surface temperature and moisture before adhesive application and stop work when conditions are out of range.

Mechanically attached EPDM: Less common in new installation but present throughout Atlanta's existing EPDM inventory. Membrane fastened with screws and plates on a pattern designed against the building's wind-uplift requirement. Mechanically attached EPDM is appropriate for standard dry-interior industrial and warehouse applications where the fully adhered premium is not justified. For existing mechanically attached EPDM systems in the Marietta and Gwinnett industrial corridors that are showing seam stress or membrane fatigue, repair involves seam replacement with EPDM tape or splicing adhesive - not hot-air welding, which is the TPO repair method and is incompatible with EPDM.

Ballasted EPDM: Exists in Atlanta's older building inventory - typically large-footprint industrial buildings from the 1980s where the structural system was rated for the 10 to 12 pounds per square foot ballast load. Replacement of ballasted EPDM systems in Atlanta typically moves to mechanically attached or fully adhered TPO or EPDM rather than reinstalling ballasted, because most current building owners prefer not to carry the structural load or the complexity of future repair work that ballasted systems present.