A lot of the medical office buildings near the Atrium Health Navicent corridor and the institutional buildings around Mercer stay fully occupied through a reroof. Modified bitumen's multi-ply, phased installation makes that possible without leaving the building exposed at the end of a workday.
Modified bitumen goes down in layers, a base sheet, sometimes a mid-ply, and a cap sheet, each one adding watertightness before the next goes on top. That layered approach lets us close out a section of roof at the end of a shift even on a multi-day job, which matters on a medical office building where patients and staff are inside during the work.
We sequence installation by roof section so we're never leaving a large open area exposed overnight, particularly during Georgia's spring and summer thunderstorm season when an unexpected evening cell can roll through with little warning. Each section gets temporary flashing and a secure edge detail before the crew moves to the next area, so the building is never more than a few hours away from being fully weathertight again if conditions change.
Torch-applied modified bitumen bonds the cap sheet with an open flame, which delivers a strong bond but requires fire-watch protocol and isn't appropriate for every occupied building. For medical facilities and buildings with sensitive interior operations, we often spec cold-applied adhesive or self-adhered membrane instead, trading a small amount of installed cost for a safer application method around occupied space. Open-flame torch work near an HVAC intake feeding a clinical space is a risk most facility directors aren't willing to accept regardless of the modest cost savings a torch-applied system offers.
We walk owners through that tradeoff directly rather than defaulting to whichever method is fastest for us. A hospital-adjacent medical office building and a standalone warehouse call for different answers to the same question.
The layered construction gives modified bitumen more built-in redundancy against hail impact than a single-ply membrane, since a hail strike has to penetrate multiple plies before it reaches the deck. That matters in a market that sees regular severe thunderstorm activity and occasional significant hail events moving through the I-75 corridor.
After a hail event, we inspect modified bitumen roofs for granule loss and mat exposure on the cap sheet, documenting the damage with photographs an owner can use for an insurance claim.
Modified bitumen's flexibility makes it a good match for the irregular parapets, mechanical curbs, and roof-to-wall transitions common on older institutional and church buildings downtown. We flash those details with compatible modified bitumen flashing rather than mixing membrane types at transitions, which is a common source of leaks on older buildings we're called to repair.
Many of the older commercial buildings we service downtown already carry a built-up roof from decades ago. Modified bitumen is often the practical recover option in that scenario, tying into the existing gravel-stop or edge metal without requiring a full tear-off, provided the deck and insulation below still pass inspection.
We core-sample those roofs before recommending recover over replacement, since a deck with hidden moisture damage needs tear-off regardless of how sound the surface looks.
Buildings tied into the medical corridor near Atrium Health Navicent often have HVAC intakes, sensitive diagnostic equipment, or clinical space directly below the roof deck. We coordinate odor-producing steps of the modified bitumen process, and material staging, around those operational realities, and we're upfront about which application method keeps that disruption lowest before the owner picks a system.
We're not affiliated with any specific hospital system or medical group in the area; we simply do a meaningful share of our institutional work in that corridor and plan our scopes accordingly.
We also schedule around shift change and delivery windows at these buildings rather than assuming standard business hours apply, since a medical office building's busiest and quietest hours often don't match a typical retail or warehouse schedule.
Yes, and we typically recommend cold-applied or self-adhered systems for occupied medical space to avoid open-flame application near sensitive equipment or patient areas.
Its multi-ply construction generally offers more impact redundancy than a single-ply membrane, though actual performance depends on the specific products and impact severity.
It depends on the building and budget. We spec a base sheet and cap sheet minimum, with an added mid-ply where extra redundancy is warranted.
Where the existing product line is still available, yes. Where it's been discontinued, we'll recommend the closest current equivalent and detail the transition in the scope.
Yes, cold-applied and self-adhered modified bitumen avoid open flame entirely and are our standard recommendation for occupied medical and institutional buildings.
