Detroit’s roofing conversation is shaped by two things that reinforce each other unpleasantly: harsh winters, and an older housing stock that was not built to today’s insulation and ventilation standards. Wayne County averages 35 inches of snowfall a year, winter temperatures routinely dip below 20°F, and the resulting freeze-thaw cycling forms ice dams reliably on any Detroit-area roof where the attic runs warmer than it should. On the older, steeper roofs across Detroit proper, Hamtramck, Grosse Pointe, and the inner-ring suburbs, that ice-dam pressure is the single largest source of winter leaks.
The mechanism is always the same: warm air escapes from the living space into the attic, warms the roof deck, melts snow, meltwater refreezes at the colder eave, and the ridge of ice pushes subsequent meltwater back up under the shingles. Insulation and ventilation are the fix; the ice-and-water barrier at the eave required under Michigan code (IRC 2018 R806.4 mandates a minimum one-inch ventilation gap under roof sheathing) is a mitigation. A Detroit re-roof that does not add insulation and continuous soffit-to-ridge airflow is treating a symptom, not the cause.
Older brick homes need contractors who understand them
A large share of Detroit’s residential stock is early-to-mid twentieth century brick, with steep pitches, complex valleys, dormers, and framing that predates modern engineered lumber. A crew accustomed to tear-and-replace on 1990s tract housing will struggle with the framing quirks, and the resulting compromises usually show up at valleys and dormer intersections. Look for a Detroit contractor whose portfolio includes work on comparable older homes.
Roof life runs shorter here than the warranty suggests
Most asphalt shingle roofs in Detroit deliver 18 to 25 years — meaningfully less than the manufacturer’s warranty. The combination of freeze-thaw cycling, snow load, and summer heat compresses the useful life, and the difference is even sharper on roofs with poor original ventilation. Buying a 50-year shingle for a Detroit roof does not necessarily deliver 50 years of service; buying a shorter-warranty shingle with better installation and ventilation often does.
Wayne County permits and inspections
The City of Detroit requires a permit through the Buildings, Safety Engineering and Environmental Department (BSEED) for a full re-roof, and suburban Wayne County jurisdictions each pull their own. Ice-barrier compliance, ventilation gap, and drip-edge details are inspected — non-compliance blocks the certificate of occupancy on any concurrent work. Confirm the permit is a line item on the written quote.