Ann Arbor sits west of Detroit in Washtenaw County, and the roofing environment shares southeast Michigan’s harsh-winter pattern — significant snowfall, sub-zero cold snaps, freeze-thaw cycling — with a distinctive local character shaped by the University of Michigan and the older, more academic-adjacent neighbourhoods that dominate the city. Historic homes across the Old West Side, Burns Park, and the near-campus areas have their own preservation and craftsmanship considerations.
The everyday problem is what it is across greater Detroit: ice-dam pressure on any home with under-insulated attic, freeze-thaw wear on flashings, and periodic hail and wind stress. Michigan’s IRC-adopted requirements (2018 R806.4 mandates a minimum one-inch ventilation gap under sheathing) are what stands between many Ann Arbor roofs and winter leaks.
Ice dams on older Ann Arbor homes
Ann Arbor’s historic housing stock combines Victorian, Craftsman, and pre-war construction with attic ventilation practices that fall well short of current code. R-49+ insulation and continuous soffit-to-ridge ventilation is the fix for recurring ice-dam problems.
Historic-district review
The Old West Side Historic District, Ann Street area, and other locally-designated Ann Arbor districts trigger review through the Ann Arbor Historic District Commission for exterior work. Material choices may be constrained on historic-district parcels — slate, cedar shake, or specific asphalt profiles may be required.
Slate stock is meaningful in older neighbourhoods
The historic slate roofs across some of Ann Arbor’s older stock can outlast the buildings when maintained correctly. Slate failure is almost always copper flashing or fastening — not the slate itself.
Class 4 impact-rated shingles are worth pricing
Southeast Michigan sees hail events on a recurring basis. Class 4 impact-rated shingles carry a wind-and-hail premium discount with most Michigan carriers.
High-wind fastening for Midwest thunderstorms
Midwest thunderstorm gusts routinely peel shingles at ridges and hips on roofs with sparse fastening. Six nails per shingle in the double-thickness zone, a proper starter course, and hip-and-ridge shingles rated for the wind class of the field should all appear on an Ann Arbor re-roof scope.
Ann Arbor permits
The Ann Arbor Building Department issues re-roof permits, and inspection includes ice-barrier extent, ventilation gap, and fastening pattern. Historic districts add a pre-permit review. Both should appear as line items on the written quote.