Reroofing Ann Arbor's Campus-Adjacent Commercial Buildings
A commercial reroof decision in Ann Arbor starts with two questions: how much of the existing roof assembly is still doing its job, and how many freeze-thaw cycles has it already absorbed without a proper tear-off. Between the university's research buildings, Michigan Medicine's clinical roofs, and the older brick commercial stock along State Street and Packard, no two reroofing scopes end up looking the same.
Recover Versus Full Tear-Off on a 40-Year-Old Roof
A moisture survey settles most of this argument before we write a scope. Infrared scanning or core cuts at drain low points and parapet returns tell us how much of the insulation board underneath an old built-up or modified bitumen roof has taken on water over four decades of freeze-thaw swings. Wet insulation loses R-value and, worse, keeps re-wetting the new membrane from below no matter what goes on top of it.
Older campus-adjacent buildings near Central Campus and the Kerrytown blocks often carry masonry parapets, gravel-ballasted built-up roofs, and generations of patch repairs stacked on top of each other. On those roofs a recover is rarely honest math once the moisture survey comes back positive in more than a handful of spots. A full tear-off costs more up front but resets the clock instead of insulating a wet deck.
Membrane Selection for Michigan's Temperature Swing
Ann Arbor sees roof deck temperatures that swing from summer highs near a hot black membrane surface to sub-zero cold snaps within a matter of months, and that range matters more for membrane chemistry than most owners expect. EPDM stays flexible in deep cold better than some single-plies, which is why it still shows up on smaller commercial roofs and additions where low-temperature seam performance is the priority. TPO and PVC handle the swing well too, provided the hot-air welding happens inside the manufacturer's temperature window rather than being forced on a 20-degree install day.
Where an existing membrane is sound but faded or ponding slightly, a fluid-applied recoat can extend service life without a full tear-off; that option is detailed on our silicone roof coatings page.
Phasing Reroofs Around Academic and Clinical Schedules
Central Campus and North Campus buildings run on an academic calendar that makes summer the obvious construction window, but Michigan Medicine's surgical and inpatient roofs don't get that luxury. Reroofing over an occupied clinical building means coordinating noise-generating work, odor control from adhesives, and crane staging around procedure schedules rather than a semester break.
Lab buildings carry their own constraints. Roofs over vivarium space or sensitive research equipment at facilities like the North Campus Research Complex need continuous exhaust and negative-pressure systems maintained through the work, which changes how we sequence tear-off area by area instead of opening large sections at once.
What Gets Checked Before the Spec Is Written
Before we finalize a reroof spec, several structural and code items get reviewed together rather than assumed:
- Deck type and condition, including steel, concrete, or wood plank, and whether it needs repair before new insulation goes down
- Insulation thickness needed to meet current Michigan energy code R-value targets
- Wind uplift zone and fastening pattern, since exposed sites near open parking fields see higher perimeter and corner loads
- Snow drift accumulation against parapets and rooftop units, which changes structural loading in specific zones rather than uniformly
- Rooftop equipment weight and curb condition for anything being reset during the reroof
- Existing warranty status and whether a tear-off voids coverage that's still active
Sheet Metal and Drainage Get Rebid With the Membrane
A reroof that leaves the old edge metal and drains in place is usually a reroof that leaks again within a few winters. Coping, gutters, and scuppers take direct freeze-thaw abuse and often need replacement on the same timeline as the membrane; we scope that work alongside the field membrane rather than as a change order discovered mid-project. Details on that scope are on our edge metal, coping, and gutters page.
Drain bowls and scupper throats get the same review. A membrane can be brand new and still hold water at a low point if the drain sump wasn't reset or the scupper opening wasn't resized during the reroof, and ponding water shortens a new roof's service life faster than almost anything else on the assembly.
Budgeting a Reroof Across a Multi-Building Portfolio
Property managers overseeing several buildings near campus, whether that's a mix of medical office space, older retail conversions, or research-adjacent buildings, rarely want every roof replaced in the same fiscal year. We help sequence a portfolio by remaining service life and risk, putting roofs with active moisture problems ahead of ones that are simply aging out, so capital gets spent where it prevents a failure rather than just on the oldest square footage.
Reroofing Questions We Hear Most in Ann Arbor
How do I know if my roof needs a recover or a full tear-off?
A moisture survey is the honest answer. If wet insulation shows up in more than isolated spots, a recover just traps that moisture under a new membrane. We show owners the scan results before recommending either path.
How long does a commercial reroof take on an occupied building?
It depends on square footage and how tightly the building needs to stay operational, but phased work over an occupied clinical or lab building typically runs longer than the same square footage on a vacant warehouse shell, because each day's tear-off area has to be dried in before crews leave.
Does Michigan's freeze-thaw cycle change which membrane you'd recommend?
It narrows the field more than it dictates a single answer. We weigh low-temperature seam performance, UV exposure, and rooftop traffic together rather than picking a membrane on cold tolerance alone.
Can reroofing happen during a Michigan winter?
Emergency and limited-area work can, with heated tents and adjusted adhesive chemistry, but we schedule full reroofs for windows with more workable temperatures whenever the building's calendar allows it.
What happens to the torn-off roofing material?
Old membrane, insulation, and ballast get separated and hauled off site through standard construction debris channels; we account for disposal volume in the estimate rather than treating it as an afterthought.