EPDM Roofing in Dearborn, MI
A black rubber sheet on a low-slope roof is EPDM, and the condition that changes the decision is how the seams and flashings are holding. EPDM is a cured rubber sheet whose seams are bonded with tape or adhesive, not welded, and that single fact shapes everything a facility director needs to know about it. The sheet itself stays flexible in cold weather and forgives building movement. The splices and the flashing details are where the maintenance attention goes.
With 30.8 inches of snow a year at the Dearborn, MI station, most of it between November and April, an EPDM roof spends much of the season buried, and a membrane with a northern track record is a reasonable candidate. We check the assembly first, then the splices in sequence, and then say what the roof needs.
Rubber Sheet, Bonded Seams
EPDM, ethylene propylene diene monomer, comes in black and white, in thicknesses commonly from 45 to 90 mil, and in wide sheets that reduce the number of field seams. Black sheet absorbs heat and white sheet reflects it, which affects cooling load and the way snow melts. Seams are joined with seam tape or splice adhesive, and the quality of the bond depends on a clean, dry, primed surface and firm pressure at installation.
Flashing is usually formed from uncured EPDM or prefabricated boots, and corners use preformed pieces. Because bonded details are the weak point, we inspect every corner, boot and termination, probing for lift and photographing each one. The count and location of problems goes on the roof plan.
Black and white EPDM age in different ways. The black sheet runs hotter in summer and moves more with temperature, and the white sheet carries a reflective surface layer that wears with weather. In both, the sheet is the durable part. Most problems start at laps, tapes and flashings, and a roof with sound splices and a supple sheet can keep performing for many years, if drainage stays clear and foot traffic stays on marked walk paths.
Behavior in a Michigan Winter
NWS Detroit dates the first measurable snow at roughly November 16 and the last at roughly April 7, so the Dearborn area spends close to five months in the snow season. EPDM stays flexible in the cold and does not crack the way brittle membranes can, which is the main reason it is common in northern markets. Ice and snow load the surface, and drains choked with ice send meltwater to the nearest low spot.
Cold affects installation more than service. Adhesives and tapes need surfaces warm enough to cure, so the main window is the warm season, and a late-fall start carries a weather hold. If the schedule slips past reliable cure conditions, we stop at a watertight stage with temporary protection and finish in spring.
Adhered, Ballasted and Fastened
Fully adhered EPDM is glued to the substrate, gives a smooth surface and handles wind well. Ballasted EPDM is laid loose and held by stone or pavers, which is economical on the right deck but heavy, and the stone hides the membrane from inspection. Mechanically attached EPDM is secured with plates and screws along battens or seams.
Ballasted roofs need extra planning. Every inspection means moving stone, and drains must stay clear of it. When we find failing seams under ballast, we price both the repair and the cost of moving the stone, since the ballast is a large part of the work. A commercial roof repair on such a roof starts with clearing a working area around the damage.
Splice, Flashing and Corner Failures
The usual EPDM failures are open or lifting splices, shrinkage at flashings and terminations, split corners and punctures. Shrinkage pulls the sheet away from walls and curbs, and the pull concentrates at corners and around penetrations. UV and heat age the surface slowly, and the membrane may chalk while staying flexible far longer than many alternatives.
A flashing failure repair removes the old bond, cleans and primes the surface and installs new flashing with proper terminations. Small splice openings can be cleaned and re-taped, with the weathered surface scrubbed off so the new tape meets fresh rubber. Where splices have failed across many areas, a coating or recover may cost less than repairing them one by one, and the scope compares both.
Wet Insulation and the Repair Boundary
An EPDM roof can leak at a splice and carry the water a long way beneath the sheet, so the leak you see is rarely the one that started it. An infrared moisture survey finds trapped water, and cores confirm what it finds. We draw the wet boundary on the roof plan, date it, and let it set the repair limit.
Repair is possible when wet areas are limited. Wet insulation over a broad area calls for replacement of the affected section, and sometimes the whole roof. A recover over wet insulation only hides a problem, so the scope will not offer it. The remaining service life of the sheet, judged by flexibility and surface condition, goes into the same record.
Repair, Coat, Recover or Replace
Aging EPDM presents four paths. Repair closes isolated failures. A coating, where the sheet is clean and sound, adds protection and reflectance. A recover with a different membrane adds a new surface if the insulation is dry. A full replacement starts over with new insulation and membrane. Permitted work falls under the state's 2021 codes, and the energy side can affect insulation whenever a roof is torn off.
Compared with TPO and PVC, which weld their seams, EPDM trades seam risk for repair simplicity. A twice-yearly check of the splices fits it well: one visit after the thaw, when winter movement has shown itself, and one in early fall, before the first snow. The price comparison is plain. Material, labor for splice and flashing work, insulation and cover board, tear-off if needed, and the cost of keeping an eye on the roof. We show those lines for each path so the facility director can compare them.
Where EPDM Shows Up Around Dearborn
EPDM is a common choice on low-slope institutional and commercial roofs, so the campuses of Henry Ford College and the University of Michigan-Dearborn, the commercial blocks of the Dix-Vernor corridor, Warren Avenue and the East and West Downtown districts all put the question to a roof walk, and the walk settles what each building actually has. The same seam-first check applies in Allen Park, Melvindale and Detroit.
Commercial Roofing Questions
How do EPDM seams differ from TPO seams?
EPDM seams are bonded with tape or adhesive, and TPO seams are welded with hot air. Bonded seams need more frequent checking, particularly at corners and flashing terminations after each winter.
Does ballast hide problems?
It hides the membrane from view. Inspection means moving stone, and repairs must clear a working area first, which adds time and cost that the scope shows separately.
Is black EPDM a problem for cooling costs?
It absorbs more heat than white. The building's cooling load and the energy code decide whether white is worth the added cost, and we compare both in the scope.
Can EPDM be repaired in cold weather?
Temporary repairs can. Permanent bonded repairs wait for surfaces warm and dry enough to cure the adhesive, and the record states which repairs are temporary.
How long before shrinkage becomes a leak?
It varies. We look for pulled corners and lifted terminations, measure them and set a follow-up date, so that movement shows up in the record before water does.
Schedule an inspection of the roof seams
Send the roof plan, the leak history and the access details. We will inspect the splices, test the insulation and write down the findings, so you can choose between repair, coating, recover and replacement.
