Commercial Roof Inspection Checklist: What Building Owners Should Look For
A commercial roof is more than a structural feature—it’s a major investment. Whether you manage a warehouse, office, church, or retail center, your roofing system plays a vital role in protecting assets, equipment, and the people inside. That’s why regular roof inspections are essential for preventing costly repairs, avoiding unexpected shutdowns, and maximizing the life of the roof.
This commercial roof inspection checklist is designed to help Michigan building owners know what to look for—and when to bring in a professional.
Why Commercial Roof Inspections Matter
Unlike residential roofs, commercial roofing systems often cover larger areas, have flatter slopes, and include specialized features like HVAC units, solar panels, or skylights. These elements make commercial roofs more vulnerable to long-term wear, drainage issues, and structural strain.
Regular inspections can help you:
Spot early signs of membrane failure
Prevent water intrusion or mold development
Comply with insurance or lease requirements
Protect warranties that require routine upkeep
Save on long-term costs by catching issues early
Michigan’s freeze-thaw cycles, summer storms, and heavy snow loads make inspections especially critical in this region.
When Should You Schedule a Commercial Roof Inspection?
Most commercial roofs should be professionally inspected at least twice per year—ideally in the spring and fall.
Also schedule inspections:
After severe weather (wind, hail, snowstorms)
When leasing, buying, or selling the building
Before and after installing rooftop equipment
If your roof is more than 10 years old
When you notice signs of sagging, leaks, or drainage problems
Commercial Roof Inspection Checklist
1. Inspect the Roof Surface or Membrane
Depending on your roofing system—EPDM, TPO, PVC, built-up roofing (BUR), or modified bitumen—look for:
Cracks, blisters, or punctures
Open seams or loose membranes
Standing water or poor drainage
Discoloration or algae growth
Damage from foot traffic or rooftop units
Flat roofs are especially prone to ponding water, which can degrade materials and lead to structural rot.
2. Check Flashing and Roof Edges
Flashing is critical for sealing areas where different surfaces meet, such as around vents, parapet walls, and HVAC curbs. Over time, flashing can become detached or deteriorated.
Look for:
Gaps or tears in flashing
Rust or corrosion on metal components
Improperly sealed corners or transitions
Loose perimeter edges or fasteners
Faulty flashing is one of the most common sources of leaks on commercial buildings.
3. Examine Roof Penetrations
Every opening in the roof presents a potential vulnerability. This includes:
HVAC ducts and units
Plumbing stacks or vent pipes
Skylights or access hatches
Solar panel mounts or satellite dishes
Check for:
Cracked or missing sealants
Water stains or soft spots nearby
Unsecured equipment bases
Sealants degrade over time, especially under UV exposure, so routine reapplication may be needed.
4. Gutters, Drains, and Scuppers
Drainage systems are crucial to keep water from pooling and damaging the roof structure.
Inspect:
Internal drains and strainers for debris
Scuppers (wall-level outlets) for clogs or obstructions
Downspouts for blockages
Evidence of overflow, such as water streaks or ponding
Make sure all drainage points are free-flowing and properly pitched toward outlets.
5. Check the Interior for Signs of Water Damage
Often, the first sign of roof failure appears inside the building.
Watch for:
Ceiling stains or sagging tiles
Musty odors in upper-level rooms
Mold growth on walls or insulation
Drips or water lines after rainfall
These indicators mean water has likely breached the roof barrier and may already be compromising insulation or framing.
6. Look at Rooftop Equipment
HVAC units, exhaust fans, and other rooftop structures often cause vibration or weight stress over time.
Inspect for:
Loose flashing around equipment curbs
Missing fasteners or lifted panels
Pools of oil or water from malfunctioning machinery
Make sure all penetrations are properly flashed and resealed during any maintenance work.
What a Professional Commercial Roof Inspection Includes
While self-checks are helpful, commercial roofing systems should also be inspected by a qualified contractor who can:
Provide photo documentation and condition reports
Use infrared or moisture scanning to detect hidden leaks
Perform core cuts (if needed) to evaluate insulation integrity
Assess the roof’s remaining lifespan and warranty compliance
Routine professional inspections are often required to maintain manufacturer warranties.
Inspection Reports: What to Expect
A full roof inspection report should include:
Roof type and square footage
Noted damage or deficiencies
Photographic documentation
Recommendations for repair or maintenance
Estimated service life of the current system
Keep inspection records in your facility maintenance log for future reference and insurance purposes.
Commercial roofs don’t last forever—but with routine inspections and preventive care, they can easily last 20–30 years or more. Staying proactive with a detailed checklist can help you avoid expensive emergency repairs and protect your property value long-term.
