Most retail stores, offices and warehouses have low-slope or flat roofs. Knowing which type a building has helps a facility manager understand what can go wrong, how it is repaired and what maintenance it needs.
Single-ply membranes
Single-ply roofs are sheets of synthetic membrane laid over insulation and sealed at the seams.
- TPO (thermoplastic polyolefin): usually white and reflective; seams are heat-welded.
- PVC (polyvinyl chloride): heat-welded seams; often chosen for restaurants because of its resistance to grease and chemicals.
- EPDM (synthetic rubber): usually black; seams are taped or glued.
Common problems: open seams, punctures from foot traffic or dropped tools, and shrinkage at edges and around equipment.
Built-up roofing (BUR)
Built-up roofs are layers of roofing felt and asphalt or coal tar, often topped with gravel. They are heavy and durable.
Common problems: blistering, cracking and leaks at flashings.
Modified bitumen
Modified bitumen is an asphalt-based roof applied in rolls, often in two layers, and sealed with heat or adhesive.
Common problems: seam failure, blistering and wear at flashings.
Metal roofing
Metal roofs are common on warehouses and some retail buildings, as standing-seam panels or corrugated sheets.
Common problems: loose fasteners, rust and leaks at seams and penetrations.
Spray foam and coatings
Spray polyurethane foam is sprayed on as a liquid that expands into a solid layer, then protected with a coating. Roof coatings can also be applied over existing roofs to extend their life.
Common problems: coating wear from sun exposure and damage from foot traffic.
Maintenance every commercial roof needs
- Inspections on a schedule and after major storms
- Clearing drains, gutters and scuppers
- Checking flashings around rooftop units, vents and skylights
- Limiting foot traffic and using walk pads near equipment
- Fixing small leaks before they spread under the membrane
Repair or replace?
Small leaks and seam failures are repaired. When leaks keep coming back, the membrane is near the end of its life, or wet insulation is widespread, replacement may cost less over time. Roof warranties often require repairs by approved contractors, so check the warranty before work starts.
How Facility First handles roofing
Facility First dispatches commercial roofing providers for leaks and repairs, schedules inspections and drain clearing, and keeps photos and warranty details with each location’s record. Commercial roofing services