Commercial Roof Maintenance FAQ

A commercial flat roof should typically be inspected at least twice a year, often in the spring and fall, and after major weather events.

For large commercial, industrial, warehouse, manufacturing, and multi-tenant properties, regular roof inspections help identify small issues before they become larger repairs. Inspections can also support warranty documentation, capital planning, insurance records, and long-term roof asset management.

If your building is located in Windsor, Toronto, London, or another area that experiences heavy rain, wind, snow, ice, and freeze-thaw cycles, seasonal inspections are especially important.

Some of the most common commercial flat roof problems include:

• Leaks and moisture infiltration
• Ponding water
• Flashing failure
• Membrane damage
• Vegetation and debris buildup
• Clogged drains or scuppers
• Damage around rooftop HVAC units
• Open seams or punctures
• Aging roof materials

Many of these issues are preventable or easier to manage when they are found early through routine commercial roof maintenance.

Ponding water can be caused by clogged drains, blocked scuppers, poor roof slope, insulation settlement, structural movement, or debris buildup.

While flat roofs are designed to manage water, standing water that remains for too long after rainfall can create additional stress on the roof system. Over time, ponding water may accelerate membrane wear, contribute to leaks, and make existing roof issues worse.

If water is regularly collecting on your commercial roof, it is a good idea to schedule a roof inspection to determine whether drainage repairs, cleaning, or further investigation are needed.

You should call a commercial roofing contractor if you notice active leaks, interior water stains, recurring leak areas, loose flashing, membrane damage, blocked drains, ponding water, storm damage, or moisture near rooftop equipment.

A roof issue does not need to look severe to require attention. Small punctures, open seams, or flashing gaps can allow water into the roof assembly and create larger problems over time.

For occupied buildings, warehouses, retail properties, office buildings, industrial facilities, and manufacturing spaces, timely commercial roof repair can help reduce disruption and protect the people, inventory, equipment, and operations inside.

Yes. Summer heat can contribute to roof wear, especially on older or already vulnerable roof systems.

Heat, UV exposure, humidity, and daily temperature changes can cause roofing materials to expand and contract. This can put added stress on seams, flashings, penetrations, and membrane surfaces. During summer, rooftop HVAC service also increases, which can add more foot traffic around units, curbs, and service pathways.

A summer commercial roof inspection can help identify early signs of membrane damage, cracking, blistering, open seams, or areas that may need repair.

Rooftop HVAC units are common leak points because they involve multiple roof penetrations, curbs, seams, flashings, and service access areas.

In the summer, HVAC systems often require more maintenance, which means more contractors walking on the roof. Foot traffic, tools, open panels, aging seals, and damaged flashing around rooftop units can all increase the risk of leaks.

During a commercial roof inspection, areas around HVAC units, vents, pipes, roof hatches, and other penetrations should be reviewed carefully.

After heavy rain, high winds, or severe weather, facility managers should check for interior water stains, active leaks, ceiling tile damage, wet flooring, blocked drains, loose metal, debris on the roof, ponding water, or damage around rooftop units.

It is also important to look for changes inside the building, including musty odours, damp areas, or recurring moisture in the same location.

If your building experienced a major storm in Windsor, Toronto, London, or the surrounding region, a professional roof inspection can help confirm whether repairs are needed before the next weather event.

Preventative roof maintenance is a planned approach to inspecting, documenting, cleaning, and repairing a commercial roof before issues become larger problems.

A preventative maintenance program may include:

• Seasonal roof inspections
• Drain and scupper checks
• Debris removal
• Flashing and seam review
• Small repairs
• Photo documentation
• Roof condition reports
• Infrared drone inspections when needed
• Long-term roof asset planning

For commercial and industrial properties, preventative maintenance helps reduce emergency repair calls, extend the life of the roof system, and support better budgeting.

Infrared drone inspections can be valuable for large commercial and industrial roofs, especially when there are concerns about trapped moisture, hidden damage, or unknown leak sources.

Not every roof issue is visible during a standard walkthrough. Infrared technology can help identify temperature differences that may indicate moisture or areas requiring closer investigation.

For property portfolios, warehouses, industrial buildings, and large flat roofs, infrared drone inspections can provide useful information for repair planning, budgeting, and long-term roof management.

A professional roof assessment can help determine whether your roof needs targeted repairs, ongoing maintenance, restoration, or replacement.

Factors may include the age of the roof, type of roof system, number of leaks, condition of the membrane, drainage performance, insulation condition, warranty status, and the cost of ongoing repairs.

If your roof is leaking repeatedly, holding water, showing widespread membrane damage, or causing operational disruptions, it may be time to review long-term options.

Commercial roof maintenance is about more than fixing leaks.

Your roof protects your people, operations, tenants, inventory, equipment, and long-term asset value. When a roof issue is ignored, it can lead to business disruption, interior damage, safety concerns, and higher repair costs.

Routine inspections and preventative maintenance give building owners and facility teams better visibility into the condition of the roof and help reduce surprises.