Exhaust Fans
Fan curbs vibrate and loosen their flashing. Residue from the exhaust also lands on panels downwind and has to be cleaned. Fan bases are re-fastened where they rock.
As a Yeadon metal roof coating contractor, we repair flashing at vents and curbs, clean exhaust residue, and coat around rooftop equipment.


Yeadon metal roof coating projects often involve roofs packed with exhaust fans, vents, and unit curbs. Every opening needs sound flashing and a clear plan for how the coating meets it. We also check where exhaust has dirtied the panels and keep the finished coating reachable for future equipment service.
Equipment roofs also see more visits after coating. Marking service routes and adding walk pads during the job keeps future technicians from wearing paths into the new coating.
With so many openings, the panels between them matter less than the joints around them.
Fan curbs vibrate and loosen their flashing. Residue from the exhaust also lands on panels downwind and has to be cleaned. Fan bases are re-fastened where they rock.
Heating and cooling curbs sit on the panels with sealant joints that dry out. Each joint gets new sealant and fabric. Curb corners get extra fabric.
Drips from unit condensate pool on the roof and stain coatings. Lines get routed to drains or gutters. Splash blocks catch drips that remain.
Rubber boots around pipes crack in the sun. Cracked boots are replaced before the field coat. Lead or rubber boots are matched to the pipe.
Technicians cross the roof often. Their routes get walk pads so the coating survives the traffic. Pads are sized to each unit door.
With equipment on the roof, coating avoids moving units the way a full replacement would.
| What Changes | Coating The Roof | Replacing The Roof |
|---|---|---|
| Planning cost | About $2.50 to $4.00 per square foot of roof | About $5 to $8 per square foot |
| Rooftop units | Stay in place; curbs re-flashed | Lifted or disconnected during tear-off |
| Equipment downtime | Short shutdowns near the work | Longer shutdowns per unit |
| Flashing | Rebuilt at each opening | Rebuilt at each opening |
| Future service | Walk pads on service routes | New membrane needs pads too |
| Exhaust residue | Degreased and tested before coating | New panels under the fans |
Roofs with lots of equipment usually follow one of these four paths.
Roofs with many fans and curbs take a metal system with reinforced flashing at every opening.
Spots where condensate collects suit silicone, which handles water that lingers.
Foam fills around crowded penetrations in one layer on dry, fastened roofs, then gets a topcoat.
The planning range is about $2.50 to $4.00 per square foot, with flashing work at many openings adding to it.
Curbs with cracked sealant and loose metal get new flashing, fabric at the corners, and a coating tie-in at the base.
Pads laid on the paths to each fan and unit keep repeat visits from wearing the new coating down to metal.
Most leaks on equipment-heavy roofs start at a curb or boot. Get a ballpark range, then we will trace the source on a roof walk. Bring a list of the units on the roof if you have one.
Equipment roofs need coordination with whoever services the units. The steps below build that in.
Every curb, fan, boot, and condensate line is checked, along with exhaust residue and the panels between units. Each opening is numbered on a roof plan.
Short equipment shutdowns are scheduled with you so we can work at each curb safely. Lockout steps are agreed before work starts.
Curb joints, fan bases, and pipe boots get new sealant, fabric, or replacement boots. Boots are matched to pipe sizes on site.
Panels are washed, exhaust residue degreased, and rust primed before coating. Degreased spots are rinsed and dried.
The field is coated around each unit and walk pads go down on the service routes. Pad locations are marked for future techs.
We walk the roof with you and whoever services the units, show the new walk pads, and note which curbs and boots to check after storms.
Along with Yeadon, we coat commercial roofs in these nearby communities, from loading-dock warehouses to older patched roofs.
Outside these towns? Call us or send us a message.
City warehouses with long screw rows and rusted laps.
Coating staged around trucks and dock doors.
Weak panels and wet insulation fixed before coating.
Vents need sound flashing and a clear plan for where the coating stops. We check curb joints, service access, and exhaust residue nearby, and keep the finished roof reachable for future inspection around each opening.
Start from about $2.50 to $4.00 per square foot of roof. Each curb, fan, and boot adds flashing work, so equipment-heavy roofs often land higher than open roofs of the same size.
Only briefly, near the area being worked. We schedule short shutdowns with you for each unit or fan.
Kitchen exhaust leaves grease that blocks bonding. Those areas get degreased, retested, and sometimes a pad or shield where exhaust keeps landing.
Yes. Walk pads go down on their routes, and we mark them so new service paths do not wear through bare coating.
Usually not. Fan curbs are cleaned, re-flashed, and coated in place. A fan is lifted only when its curb needs rebuilding.
The coating ties into new flashing at the curb base, reinforced with fabric at the corners, and stops at a clean line on the curb.
Unused vents and pipes can be removed and the opening closed with new metal. That cuts one more leak point before coating.
Tell us what equipment sits on the roof and where the leaks show up. We will plan the work around it.