Roofing
Commercial roof inspection and maintenance program field guide
How a facility manager runs a real roof program: the spring and fall cadence, the warranty maintenance the manufacturer requires, the inspection walk, the drains, and the roof file that backs every decision.
Direct answer
A roof inspection and maintenance program is a scheduled cycle of documented roof inspections and minor repairs that keeps a commercial roof watertight and the warranty valid. Industry practice, following NRCA guidance, is to inspect twice a year, in spring and fall, plus after any major storm. The manufacturer warranty and project documents govern the required maintenance.
Key takeaways
- NRCA guidance: inspect a commercial roof at least twice a year, in spring and fall, plus after any major storm.
- Nearly every manufacturer system warranty, including No Dollar Limit, requires documented maintenance and inspection or the claim can be denied.
- Clearing drains, strainers, scuppers, and gutters is the single most important and most neglected low-slope maintenance task.
- Ponding is water standing more than about 48 hours after rain, a warranty exclusion that accelerates membrane aging.
- Repair with the manufacturer's membrane-specific materials by an approved applicator: a TPO puncture needs a welded TPO patch, not generic sealant.
The roof program, and why the roof earns one
A roof inspection and maintenance program is a standing schedule of documented roof inspections and small repairs, run on a calendar instead of run when something leaks. The roof is usually the most expensive single building component you can see from the parking lot, and it is the only one fully exposed to weather every hour of its life. Everything under it depends on it staying closed.
The math behind a program is simple. A breach the size of a pencil eraser, found in the spring and sealed in twenty minutes, costs almost nothing. The same breach found when a tenant calls about a stained ceiling has already wet the insulation, soaked the deck, and put water somewhere you will spend a week chasing. Water does not get cheaper to fix the longer it sits. It gets more expensive every storm.
So the program is not really about the roof membrane. It is about catching the cheap problem before it becomes the expensive one, and having the paper to prove the roof was maintained when the warranty claim or the capital request lands on someone's desk.
Proactive maintenance vs run-to-failure
Run-to-failure is the default on most buildings, and it is the most expensive way to own a roof. Nobody touches it until it leaks, the leak gets patched, and the patch holds until the next one. The roof reaches the end of its life early, full of trapped moisture and dead insulation, and the owner pays for a full tear-off years before they had to.
A maintained roof lasts materially longer. A commonly cited figure from the trade puts the average service life of a proactively maintained low-slope roof near 21 years against roughly 13 years run reactively, and neglect can cut a roof's life by as much as half. Treat the exact numbers as directional, not a guarantee, because they vary with the membrane, the climate, and how the building is used. The direction does not vary. Maintenance buys years.
The other half of the case is the warranty. The manufacturer's long-term warranty, the thing that made the roof worth its price, generally requires documented maintenance to stay in force. Skip the program and you have quietly thrown that away too. The program protects the asset and the warranty at the same time, on the same inspection visit.
How often should you inspect a commercial roof?
Inspect a commercial roof at least twice a year, in spring and fall, plus after any major storm or event. That cadence is the NRCA recommendation and the practice most manufacturers and consultants follow. The spring inspection catches what winter did: the freeze-thaw splits, the snow and ice damage, the debris that blew on over the cold months. The fall inspection clears the roof and the drains before winter loads it again.
Some roofs earn a tighter schedule. A roof with heavy rooftop equipment, constant trade foot traffic, a vegetated or ballasted assembly, or one past about 15 years of age is worth inspecting quarterly. The more a roof gets walked on and worked on, the more often something gets dropped, dragged, or left open.
The post-storm inspection is the one people skip, and it is the one that pays. After hail, after a wind event, after heavy snow or an ice dam, get on the roof while the damage is fresh and before the next rain drives it inside. That timing also matters for an insurance claim, because fresh, dated, photographed damage is far easier to tie to the storm than damage found three months later.
Does roof maintenance affect the warranty?
Yes, directly. Nearly every manufacturer system warranty, including the long No Dollar Limit (NDL) warranties owners pay a premium for, requires documented maintenance and periodic inspection as a condition of coverage. Miss the maintenance and the manufacturer has grounds to deny the claim, no matter what actually caused the leak.
Here is how it goes wrong. An owner files a claim eight years into a 20-year warranty. The manufacturer pulls the maintenance file. There is no file, no inspection reports, no drain-clearing records, no photos. Claim denied, not because the membrane failed on its own, but because the owner cannot show the roof was maintained the way the warranty required. The defect almost stops mattering at that point.
Two other things void warranties quietly: roof work by a non-certified contractor, and unauthorized repairs or coatings. A penetration cut for a new conduit by an electrician who is not approved for that membrane can end the warranty on the whole roof. So can a well-meaning handyman smearing the wrong sealant on a seam. Read the actual warranty document. It lists the maintenance obligations, the inspection interval, and exactly what work has to be done by an approved applicator, and that document governs, not the rule of thumb.
What does a roof inspection actually look at?
A roof inspection works from the most likely leak sources outward, not field-first. The field of a single-ply membrane rarely fails on its own. The leaks start at the joints, the edges, and everything that pokes through the roof, so that is where the trained eye goes first.
The walk covers the membrane and its seams, the base flashings at every wall and curb, the penetrations and pipe boots, the pitch pockets, the edge metal and coping, the drains and scuppers and gutters, the rooftop equipment and its supports, and the low spots where water ponds. You are looking for splits, blisters, open or fishmouthed seams, lifted flashing, dried or cracked sealant, punctures, dropped debris, and standing water. The same seam and flashing detail that a single-ply seam QA inspection runs against at install is what the maintenance inspection re-checks for the life of the roof.
Walk the whole roof, not a sample. Cover it in a grid so you do not miss a corner, and photograph every defect in place with enough background to find it again. A defect with no location is a defect nobody will find next visit.
| Area | What you are looking for |
|---|---|
| Membrane field | Splits, blisters, punctures, shrinkage, dropped debris |
| Seams | Open laps, fishmouths, voids, lifted edges |
| Base flashing and curbs | Pulled fasteners, separation, cracking at the bend |
| Penetrations and pipe boots | Cracked boots, failed clamps, open sealant |
| Pitch pockets | Shrunken or cracked filler, exposed neck |
| Edge metal and coping | Loose fasteners, open joints, displaced cleats |
| Drains, scuppers, gutters | Debris, clogged strainers, ponding nearby |
| Rooftop equipment and supports | Rust stains, abandoned curbs, abraded membrane |
Drains, scuppers, and keeping the water moving
Clearing the drains is the single most important maintenance task on a low-slope roof, and it is the one most often neglected. A roof is a shallow bowl. Wind blows leaves, trash, and grit toward the low points, the strainers clog, and the next rain has nowhere to go. The most common cause of ponding is not a broken roof. It is a blocked one.
Ponding is water that sits on the roof more than about 48 hours after the rain stops. It is its own problem and a warning of another. The standing water accelerates membrane aging, finds every weak seam, adds dead load the structure may not have been designed to carry, and is itself a common warranty exclusion. A roof that ponds is a roof aging faster than its warranty assumes.
On every inspection, pull the strainers, clear the basket and the drain bowl, check the scuppers and overflow scuppers, and run the gutters and downspouts. Look for the new ponding ring that was not there last visit, because a fresh low spot can mean a sagging deck or wet, compressed insulation underneath. Clearing drains is cheap. The leaks and the structural questions that follow a blocked one are not.
The membrane and the seams
The membrane is the waterproofing layer, and on most commercial roofs it is single-ply: TPO, PVC, or EPDM. On the inspection you are reading the sheet for age and the seams for integrity, because a sheet that tests fine in the field can still be leaking at a lap.
What you look for changes with the membrane. TPO and PVC age by surface weathering and can crack or craze as the top wears; their seams are hot-air welded into one material, and a weld that was cold or narrow at install shows up later as an open lap. EPDM shows shrinkage that pulls flashings tight at the corners, and its taped or adhered seams can lift at the edge. Across all of them, watch for blisters where moisture or air is trapped under the sheet, and splits where the membrane was stressed over a ridge or a fastener.
A seam probe, a dull rounded tool run along the seam edge under steady pressure, catches a void or an unbonded section the eye misses. Where a seam fails the probe or a flashing detail looks marginal, the single-ply seam QA approach gives the welds and the repairs a real acceptance test rather than a guess.
Flashings and penetrations: where the leaks start
Most roof leaks come from the flashings and penetrations, not the field. Anywhere the membrane stops being a flat sheet and has to turn up a wall, wrap a pipe, or seal around a curb, the detail depends on a bond or a sealant that someone made by hand, and that is the part that moves, cracks, and lets go first.
Base flashing at walls and curbs takes the worst of it, because the membrane there flexes with every thermal cycle and the top edge termination is the first thing to pull loose. Pipe boots crack with age and sun, especially the molded ones, and the clamp at the top works loose. Pitch pockets are the worst detail on any roof: the sealant filler shrinks and cracks, and the only thing keeping water out of a bundle of conduit is a ring of caulk that needs topping off on a schedule.
Check every termination bar, every clamp, every sealant joint. Sealant is a maintenance item with a life of a few years, not a permanent seal, and the program exists partly to reseal these before they open. A flashing caught lifting is a five-minute fix. The same flashing found after a rain is a wet wall and a ceiling tile.
Rooftop traffic and the damage trades leave behind
A surprising share of roof damage has nothing to do with weather. It is people: HVAC techs servicing units, electricians running conduit, the satellite installer who never should have been up there. They drop tools, drag equipment across the membrane, leave fasteners and cut-offs behind, and set hot equipment down on a sheet that does not like it.
The tell is a cluster of damage around the rooftop units and the access point, where the foot traffic concentrates. Dropped screws get stepped on and punch the membrane. Sharp-edged condensate pans abrade it. Abandoned equipment curbs from a unit that got swapped out years ago sit there collecting water and rust.
The fix is partly physical and partly procedural. Walkway pads from the roof hatch to every serviceable unit give the traffic a protected path and tell people where to step. Beyond that, control who gets on the roof. A simple rule that no trade goes up without notifying the facility office, and that the roof gets a quick look after any rooftop service call, catches the puncture before it becomes the leak nobody can explain.
What do you do when the roof leaks?
When a leak shows up inside, start a leak log entry, not a ladder. Record the date, the interior location, the conditions when it appeared, and a photo of the staining. Leaks that only show in driving rain from one direction, or only during snowmelt, tell you something about where to look, and that pattern is lost if nobody writes it down.
Then accept the hard truth: where the water shows up inside is almost never directly under the breach. Water enters at a defect, runs along the deck, follows a flute or a seam, and drips through at the first low point or fastener it finds, which can be many feet away. Chasing the stain is how owners pay to seal the wrong spot three times and still leak.
Find the actual entry point before you repair. A careful inspection of the area uphill of the interior leak finds many of them. For the buried, the stubborn, and the ones that have already been chased, an electronic leak detection survey runs current through the breach to the deck and pinpoints the hole instead of guessing, which on a ponded or overburdened roof is the difference between one repair and a season of them. Repair the cause, log the repair, then verify it the next time it rains.
The moisture survey for wet insulation
A leak that ran for a while leaves wet insulation behind, and wet insulation does not dry out under a sealed membrane. It stays wet, loses its R-value, corrodes steel decks, and feeds the next failure from underneath. A moisture survey maps where the water already is, so a repair does not just close the hole over a saturated core.
Three methods are common, and they read different things. Infrared imaging finds wet areas by the way they hold heat and release it at a different rate than dry roof after sunset, commonly run per ASTM C1153, though confirm the current designation. Nuclear gauges read hydrogen content as a proxy for moisture. Electrical capacitance and impedance meters read the change in the material's electrical properties. Each has conditions that fool it, so the survey result is a map to verify by core cut, not a verdict on its own.
Run a moisture survey when a roof is being evaluated for repair-versus-replace, after a known long-running leak, or before a recover so you are not laying a new roof over a wet one. The dry insulation can stay. The wet has to come out, and the survey tells you how much.
Should you repair the roof or replace it?
Repair while the roof is sound and replace when repairs stop holding, but that call should rest on a condition assessment, not on the last leak. A roof condition rating, scored on a consistent scale across the portfolio, and an estimate of remaining service life turn the roof from a surprise into a line in the capital plan.
The assessment looks at the membrane's age against its expected life, the extent of wet insulation from the moisture survey, the condition of the flashings and details, and how often the roof has needed repair lately. A roof that needs a repair every few months, has widespread wet insulation, and is past its design age is telling you the repair money is now being spent to delay an inevitable replacement. A sound roof with isolated, fixable defects is worth maintaining hard.
The budget follows the rating. A funded reserve, set against the remaining service life and a real replacement estimate, means the re-roof gets planned and competitively bid on your schedule, not financed in a panic the week the roof finally lets go. The program produces the data, the inspection history, the repair record, the condition trend, that makes that reserve defensible to whoever signs the check.
Making the repair right with compatible materials
A roof repair has to match the roof, or it is not a repair, it is a future leak with a delay timer. The most common field failure is the wrong material: a tube of generic sealant smeared on a TPO seam, an asphalt-based patch on a PVC roof, a peel-and-stick patch over a membrane it will not bond to. Membranes are chemically specific. PVC and TPO are not the same plastic, and what sticks to one can attack the other.
Use the membrane manufacturer's repair materials and method for that membrane. A TPO puncture gets a welded TPO patch. A PVC detail gets PVC. An EPDM seam gets the manufacturer's cover tape and primer, not roofing cement. On a roof under warranty, the repair must also be done by an applicator the manufacturer approves, or the repair itself can void the coverage even when the work looks fine.
Temporary repairs have a place, but label them as temporary in the log and schedule the permanent one. A spot of mastic to stop water tonight in the rain is fine. The problem is when the temporary patch becomes the permanent answer, nobody comes back, and the roof file shows a permanent repair that was never made.
Storm and event response
After a hail, wind, snow, or ice event, the roof gets an extra inspection, and it gets it soon. Storm damage that is open to the next rain drives water inside fast, and the sooner it is found and dried in, the smaller the interior damage. Treat the post-storm walk as part of the program, triggered by the event rather than the calendar.
Different storms leave different marks. Hail bruises and fractures the membrane, often in a pattern, and the damage can be subtle on the surface while the mat underneath is broken. Wind lifts edges, peels back flashing, and can balloon and tear a mechanically attached membrane from the perimeter in. Snow and ice add load and dam the drainage; the damage often shows at the melt, not the storm.
Document everything for the insurer the same day. Dated, located, photographed damage tied to a specific storm is a claim that gets paid. The same damage found months later, mixed in with ordinary wear, is a claim that gets argued. The post-storm inspection report is both a repair work order and the evidence file, so write it like both.
Safety and roof access
Nobody goes on the roof who is not protected from the edge. A low-slope commercial roof reads as a safe flat surface right up to the moment someone backs toward an unguarded edge with a camera to their eye. Fall protection is not optional on a maintenance walk, and OSHA treats the roof edge as the hazard it is.
OSHA fall-protection requirements govern the access and the work. Construction work commonly triggers fall protection at a 6 ft exposure, with guardrails, personal fall arrest, or warning-line systems set back from the edge as accepted approaches on low-slope roofs; general-industry rules apply to routine inspection and have their own triggers. Confirm which rule set and which distances apply to your work and your jurisdiction, because the details matter and they are enforced. A safe, code-compliant roof hatch or access ladder, and a clear path to it, is the start of every safe inspection.
Use a qualified inspector. A roof consultant or a manufacturer-approved contractor who knows the membrane, the details, and what failure looks like will see what a general maintenance tech walks past, and will do it tied off. The roof is no place to learn either the membrane or the fall hazard the hard way.
The scheduled preventive maintenance tasks
Inspection finds problems. Preventive maintenance keeps them from forming, and it is the work done on the same visit so a separate trip is not required. These are small, recurring tasks with a known life, and putting them on the calendar is most of the program.
The recurring list is short and it repeats every roof: clear the drains, strainers, scuppers, and gutters; remove debris, leaves, and trade leftovers from the field; reseal the pitch pockets, terminations, and sealant joints that have a few-year life; re-secure loose edge metal, coping, and termination bars; and trim back any trees overhanging the roof that drop debris and shade it into staying wet. On roofs with surrounding vegetation, the trimming and the drain clearing are most of what keeps the roof dry.
Pair the PM tasks with the inspection findings into one work list per visit. The inspection says what is wrong, the PM list says what gets done every time regardless, and the two together are the visit. A program that inspects but never does the small work just builds a longer list of problems with good photos of each.
Planning the re-roof: recover or tear off
Every roof reaches the end, and the program's job near that point is to make the replacement a planned project, not an emergency. The two paths are a recover, laying a new membrane over the existing one, and a tear-off, stripping to the deck and starting clean. The condition of what is under the membrane decides which is honest.
Recover is faster and cheaper, and it is only valid when the existing roof is dry and sound enough to build on. A moisture survey is the gate: lay a new roof over wet insulation and you have sealed the water in to rot the deck under a fresh warranty. Codes also limit the number of roof layers, commonly to two, so a roof already recovered once usually has to come off. A tear-off costs more and exposes the building during the work, but it lets you correct the insulation, the drainage, and the details, and it gives the new warranty a clean base.
Start the planning a few years out, using the condition rating and the reserve the program has been building. A re-roof bid competitively, scheduled in good weather, and specified from a real survey beats one bought the week the roof finally fails by a wide margin.
The critical-facility roof: data centers and clean spaces
Over a data center white space, a hospital OR, or a clean manufacturing floor, a roof leak is not a stained ceiling tile. It is downtime, a damaged equipment, or a contaminated process, and the cost of an hour of that dwarfs the cost of the roof. These roofs get a tighter program because the consequence of a miss is so much larger.
Tighter means more frequent inspection, often quarterly or better, with closer attention to anything directly over the critical area. It means leak detection that pinpoints rather than chases, because you cannot run the failures-and-patches loop over live equipment. It means strict control of rooftop work, since a contractor's dropped screw over the white space is a different kind of risk than over a warehouse. On many of these roofs the assembly itself is upgraded, with leak-detection layers or redundancy designed in.
The program documentation matters more here too. When a roof sits over uptime that is measured in nines, the inspection record, the repair history, and the condition trend are part of the facility's risk file, reviewed alongside the power and cooling, not filed and forgotten.
Should you use a roofing contractor or in-house staff?
Use in-house staff for the simple recurring tasks and a qualified roofing contractor or consultant for the inspections and the repairs, especially under warranty. Facility staff can clear drains, pick up debris, and flag obvious problems on a walk, and having them do the routine clearing between visits keeps the roof draining. What they generally should not do is repair a warranted membrane, because work by a non-approved party can void the coverage.
The inspection and the warranty-eligible repairs go to a manufacturer-approved contractor or an independent roof consultant who works for the owner. The consultant route has an advantage worth the fee on a portfolio: the consultant is not selling the repair, so the condition assessment and the repair-versus-replace call are not coming from someone who profits either way.
Whoever does the work, put it under a written maintenance agreement that names the scope, the cadence, the response time for a leak, and the documentation deliverable. A service level agreement that defines how fast someone is on the roof after a leak call, and what report you get back, turns a vague maintenance relationship into a program you can hold someone to.
The roof file: what to document
The program lives or dies on its paper. A roof that was maintained but cannot prove it is, for a warranty claim, a roof that was not maintained. The roof file is the asset, and it is what answers every question that comes later: is the warranty valid, what has this roof needed, how much life is left, what does it cost to replace.
Build a roof file per building and keep it current. It holds the roof inventory and the basic data (area, membrane type, install date, slope, deck), the roof drawings, the warranty document and its maintenance terms, every inspection report with dated photos, the full repair history, and the moisture survey and condition results. Each inspection adds a report; each repair adds a record. Over a few years that file becomes the single most useful document about the roof anyone owns. Record each inspection finding as item, condition, action, and date, so the same line tells you what was found and whether it got fixed.
| Inspection item | Condition noted | Action | Date / interval |
|---|---|---|---|
| Drains and strainers | Debris in north basket | Cleared and flushed | On each visit |
| Pitch pocket, RTU-3 | Filler cracked, neck exposed | Topped with approved sealant | Date of visit |
| Base flashing, west wall | Termination bar fastener pulled | Re-secured and resealed | Date of visit |
| Membrane field, SE corner | Ponding ring, possible wet area | Flagged for moisture survey | Follow-up scheduled |
| Pipe boot, vent stack | Clamp loose | Re-clamped, sealant renewed | Date of visit |
| Overall condition rating | Recorded score and remaining life | Updated capital plan and reserve | Annual |
Common mistakes
- Running the roof to failure with no program, then paying for an early tear-off full of wet insulation.
- Letting the drains, strainers, and scuppers clog, so the roof ponds and ages faster than its warranty assumes.
- Skipping the documented maintenance the warranty requires, then losing the claim for lack of records.
- Chasing the interior stain instead of finding the actual entry point uphill of it.
- Keeping no roof file, so nobody can show maintenance, defend a claim, or plan the replacement.
- Repairing with the wrong material, generic sealant or an incompatible patch, on a specific membrane.
- Letting a non-approved trade cut or repair a warranted roof and voiding the coverage.
- Not inspecting after a hail or wind event, so storm damage drives water inside before anyone looks.
- Letting a temporary patch become the permanent answer that nobody ever comes back to finish.
Field checklist
Want this checklist to run itself on every job — with photo proof and a signed record crews can hand the customer? That's FieldOS.
Standards and references
The NRCA, through its roofing manual and maintenance guidance, is the trade reference for the inspection program and the spring-and-fall plus post-storm cadence. It frames the practice; it does not replace the specific terms on your roof.
The membrane manufacturer's warranty is what actually governs the required maintenance. It states the inspection interval, the maintenance obligations, what counts as an approved repair, and who may perform it, and it is the document that decides a warranty claim. Read it, follow it, and keep the records it demands. Where it is stricter than the general practice, it wins.
ASTM provides the test and survey methods by topic: infrared moisture surveying is commonly run per ASTM C1153, with separate practices for nuclear and electrical-capacitance methods, so confirm the current designation before citing one. IIBEC is the professional body for roof consultants, the independent expert who can run the assessment and write the program. OSHA fall-protection requirements govern roof access and the work performed there. Through all of it, the project specifications, the owner's program, and the adopted code edition with local amendments control the specifics; treat the references here as the framework, not the final word.
Units, terms, and references
The roof world uses a handful of terms and unit conventions that show up across warranties, drawings, and inspection reports, and the same idea reads differently between them.
Roof area is measured in squares (one square equals 100 square feet) on the trade side and in square feet or square meters on drawings. Slope is given as rise over run, such as 1/4 in. per ft for a typical low-slope roof. Membrane thickness is in mils (thousandths of an inch). Insulation is rated by R-value. Ponding is the field term for water standing more than about 48 hours after rain. NDL is the No Dollar Limit warranty, the long-term coverage with maintenance strings attached.
- Low-slope roof
- A roof at a shallow pitch, commonly 1/4 in. per ft or less, where drainage and membrane integrity drive performance
- NDL warranty
- No Dollar Limit warranty: long-term manufacturer coverage that requires documented maintenance to stay in force
- Ponding
- Water standing on the roof more than about 48 hours after rain, an aging accelerant and common warranty exclusion
- Pitch pocket
- A sealant-filled box sealing an odd-shaped penetration; the filler shrinks and needs topping on a schedule
- Base flashing
- The membrane turned up a wall or curb and terminated; a primary leak source that flexes and pulls loose
- Roof condition rating
- A consistent score of a roof's overall condition used to estimate remaining life and plan capital
- Recover vs tear-off
- A new membrane over the old one (recover) versus stripping to the deck (tear-off); moisture and code layers decide
- Square
- A roofing unit of area equal to 100 square feet
FAQ
How often should you inspect a commercial roof?
Inspect a commercial roof at least twice a year, in spring and fall, plus after any major storm, which is the NRCA recommendation. Roofs with heavy equipment, constant foot traffic, or more than about 15 years of age are worth inspecting quarterly. The membrane manufacturer's warranty may set its own required interval.
Does roof maintenance affect the warranty?
Yes. Nearly every manufacturer system warranty, including No Dollar Limit warranties, requires documented maintenance and inspection as a condition of coverage. Miss it, or keep no records, and the manufacturer can deny a claim regardless of the cause. Repairs by a non-approved contractor can void coverage too. Read the actual warranty document.
What is the most common roof maintenance item?
Clearing the drains, strainers, scuppers, and gutters is the most common and most neglected maintenance item on a low-slope roof. A roof is a shallow bowl, debris blows toward the low points, and the most common cause of ponding is a blocked drain, not a broken roof. Clear them every visit.
What goes in a roof inspection?
A roof inspection covers the membrane and seams, the base flashings and penetrations, the pitch pockets, the edge metal and coping, the drains and scuppers, the rooftop equipment and supports, and the low spots that pond. Walk the whole roof in a grid, photograph every defect in place, and log item, condition, action, and date.
Should you repair or replace a commercial roof?
Repair while the roof is sound and replace when repairs stop holding, based on a condition assessment, not the last leak. A roof past its design age, with widespread wet insulation and frequent repairs, is signaling replacement. A sound roof with isolated, fixable defects is worth maintaining hard. A moisture survey informs the call.
Why does my flat roof keep ponding water?
Most ponding comes from blocked drainage: clogged strainers, blocked scuppers, or debris in the drain bowl. A new ponding ring that was not there before can also mean a sagging deck or wet, compressed insulation underneath. Clear the drains first; if the ponding stays, investigate the deck and insulation below it.
What should you do after a hailstorm or windstorm?
Get on the roof soon, before the next rain, and document the damage the same day with dated, located photos for the insurer. Hail fractures the membrane in a pattern, wind lifts edges and flashing, and snow adds load. Fresh, dated damage tied to the storm is a claim that gets paid; damage found months later gets argued.
Can I repair a roof leak with any sealant?
No. Membranes are chemically specific, so a TPO puncture needs a welded TPO patch, PVC needs PVC, and EPDM needs the manufacturer's cover tape, not generic roofing cement. The wrong material fails and can void the warranty, and on a warranted roof the repair must be done by an approved applicator using the manufacturer's method.
Who should inspect a commercial roof?
Use a manufacturer-approved roofing contractor or an independent roof consultant for inspections and warranty-eligible repairs, and in-house staff for simple drain clearing and debris removal between visits. A consultant who does not sell the repair gives an unbiased repair-versus-replace call. Whoever does the work must follow fall-protection requirements on the roof.
How do you find a roof leak when the ceiling stain is not under the hole?
Water enters at a defect, runs along the deck, and drips through far from the breach, so chasing the stain seals the wrong spot. Inspect uphill of the interior leak first. For buried, ponded, or already-chased leaks, an electronic leak detection survey runs current through the breach to the deck and pinpoints the actual hole.
People also ask
Codes cited in this guide
This guide is written and reviewed against the published standards below. Always confirm the current adopted edition with the authority having jurisdiction.