Detroit experiences an average of 45 freeze-thaw cycles per winter, creating expansion and contraction stress that tears apart single-ply membrane systems. Water trapped in roof substrates freezes, expands, and fractures inferior roof assemblies. Built-up roofing systems handle this stress through flexibility and redundancy. The multiple plies of asphalt and reinforcing fabric absorb movement without tearing. The thick flood coat of asphalt remains pliable even in subzero temperatures, preventing brittleness that causes cracking. This is why Detroit's oldest commercial buildings still function with original BUR systems installed in the 1960s and 1970s.
Detroit's commercial building stock includes structures built before modern energy codes. Upgrading to a properly insulated built-up roofing system reduces heating costs and brings older buildings into compliance with current standards. Local contractors understand the specific challenges of working on Detroit's industrial architecture, from the heavy timber decks common in pre-war warehouses to the structural steel decks in mid-century manufacturing plants. Choosing a Detroit-based roofing contractor means working with crews who understand local code requirements and have relationships with Wayne County building inspectors who expedite permits when you need emergency repairs.
