Commercial Roof Maintenance Checklist for Property Managers
Most commercial roofs are not replaced because the membrane wore out. They are replaced because a small failure went unnoticed for three years. Here is the twice-yearly walk that prevents it.
This checklist is for property managers, facility managers and building owners with low-slope roofs. Print it, or use it as the specification for whoever does your inspections.
Two visits a year: spring, after the freeze-thaw cycle and before storm season, and autumn, before winter closes in. Those are the two moments when finding a problem is worth the most.
Before you go up
Check the roof's warranty status and its term. Note who installed it and when. Have the previous inspection report to hand so you are comparing rather than starting fresh — the value of a maintenance record is in the trend.
Know the safety situation: roof access, fall protection, skylights and smoke hatches (which are fall hazards, not walking surfaces), and whether the deck is sound enough to walk. If you are not equipped for this, do not do it yourself.
Drainage — check this first, every time
Blocked drainage is the single most common cause of ponding, and ponding is the single most common warranty exclusion. Start here.
Drains and scuppers: clear of leaves, granules, wrappers and gravel. Strainers present and intact. Are they actually draining? Run water if you are unsure.
Standing water: most manufacturers define ponding as water remaining more than 48 hours after rainfall stops. Look for tide-lines, silt deposits and algae — they show where water sits even on a dry day.
Gutters and downspouts where present: clear, secure, draining away from the building.
Overflow provision: if the primary drain blocks, where does the water go? A roof is not designed to hold it.
The membrane field
Punctures and tears, particularly near rooftop equipment and along the paths people walk. Dropped tools and dropped screws are the usual cause.
Seams: lifting, fishmouths, open laps. On TPO, look for any separation along welded seams. On EPDM, check taped and adhered seams and any patch edges.
Blisters and ridging: note size and whether they have grown since the last visit. Small and stable is usually monitored; growing is investigated.
Shrinkage, especially on older EPDM — look for the membrane pulling at corners, curbs and terminations.
Debris: anything abrasive, anything that holds moisture, and anything that can become a projectile in a derecho.
Flashings, penetrations and the edge
This is where most commercial leaks actually originate — not in the field of the roof.
Base flashings at parapets and walls: secure at the top, no open laps, termination bar and sealant intact.
Curbs for HVAC units, fans and hatches: flashing sound, no separation, pitch pans full and not cracked.
Pipe penetrations: boots and collars intact, clamps tight, sealant not perished.
Coping and edge metal: joints sealed, fasteners present, no lifting. Coping that was never sealed properly at the joints puts water into the wall cavity, and it appears inside the building a long way from where it got in — which is how owners end up replacing a membrane that was never the problem.
Counter-flashing into masonry: reglet sound, sealant intact, no gaps.
Rooftop equipment — the other trades problem
Nobody damages commercial roofs more reliably than the people servicing the rooftop units. HVAC techs, refrigeration contractors, electricians and telecoms installers are on your roof several times a year, and they are not roofers.
Look for: condensate lines discharging onto the membrane or damming water; abandoned equipment, curbs and conduit left in place; sheet metal screws and offcuts on the surface waiting to be walked in; units with panels removed and imperfectly resealed; new penetrations nobody told you about.
Photograph what you find. It is occasionally useful in working out who should pay for the repair.
Inside the building
Walk the top floor and look up. Ceiling tile staining, efflorescence on interior masonry, rust on deck or joists, damp insulation, and any tenant reports of drips — even ones that stopped.
A leak that stopped has not fixed itself. It has found a slower path.
Write it down — this is the part that pays
A photographed, dated written report after every visit is the cheapest warranty insurance available.
Manufacturer warranties, Carlisle's No Dollar Limit coverage included, carry maintenance obligations and exclude damage caused by lack of maintenance. If a manufacturer's inspector arrives after a failure and finds blocked drains, flashings that have clearly been failing for years and no record of anyone ever looking, a No Dollar Limit warranty can become a no-dollar warranty.
It is also exactly what a buyer's surveyor will ask for if the building is ever sold, and what a capital planning conversation needs.
Our DFC Roof Care Program does all of the above twice a year, includes the minor repairs on the visit, and puts program buildings at the front of the queue after a storm — which is when queue position is worth the most.