Commercial Roof Maintenance Checklist: What to Check and How Often

Commercial roof maintenance comes down to two jobs: staff checks and roofer inspections. ARMA, a roofing trade group, advises a professional inspection every spring and fall and after major storms. Some membrane makers, like IKO, ask owners to look over the roof at least every three months. In between, keep the drains clear, limit who goes up there and write down every visit. A clogged drain caught early is a quick fix instead of a soaked roof.

Many offices, stores and warehouses have low-slope roofs that look flat but tilt slightly toward drains. Water drains slowly on these roofs, so a small clog or tear matters more. Most are covered by a membrane, a large sheet of roofing that keeps water out. TPO is one common type: a single-layer sheet, usually white, made for flat roofs. ARMA notes these roofs are not built for heavy foot traffic, so every trip up adds some wear.

This guide sorts the jobs your staff can safely handle from the ones that belong to a roofer. You will see what a roofer checks on a maintenance visit and why each item matters. You will also learn how rooftop work and new equipment can affect your warranty. It ends with the signs that call for help right away and the steps to take before storm season.

Caring for a Business Roof: Staff Jobs vs. Roofer Jobs

Trained maintenance staff can handle most of the housekeeping on a commercial roof. ARMA lists clearing debris and trimming tree limbs that hang over the roof as staff jobs. Leaves, cups and stray screws left after equipment service should come off before they reach a drain. Inside, staff should watch for ceiling stains and rust on the underside of a metal roof deck. Those are early clues that water is getting past the roof, often before anyone sees a drip.

Repairs are a different matter, even small ones. IKO's owner guide says to skip temporary repairs unless there is a true emergency, like an active leak. In that case, cover the spot with a tarp if it is safe to reach, and call your roofer. ARMA says major repairs belong to a professional, after checking with the roof's manufacturer. A patch of the wrong material may not stick, and it must come off before the real repair.

How to Clean a Membrane Roof Without Harming It

IKO says water, a soft broom and mild soap are enough to clean most single-layer membrane roofs. Skip harsh chemicals and solvents, since they can soften or weaken the roof sheet. IKO also suggests cleaning a TPO roof at least every two years to keep its surface bright. A clean white roof reflects more sun, so less heat builds up in the rooms below.

• Pick up loose debris, leaves and stray screws after every service trip to the roof.
• Trim tree limbs that hang over the roof or drop leaves into the drains.
• Clear drains, gutters and scuppers, the openings in edge walls that let water off the roof.
• Check ceilings and the deck underside for stains, drips or rust after heavy rain.

What a Roofer Looks for on a Commercial Maintenance Visit

A roofer starts at the roof's edges, where strong wind does the most harm. IBHS, a building safety group, calls loose edge flashing the leading cause of roof cover failure in high wind. Edge flashing is the metal trim on the roof's outer rim. Once it lifts, wind can get under the membrane and peel it back across the roof. Rooftop units come next, and IBHS says each should be strapped, bolted or anchored down.

Then the roofer checks the membrane for cracks, brittle spots, fading and lifting seams, which IBHS flags. Lightning protection cables should be tight, and solar panels should be firmly held down. Loose cables and panels can whip around in a storm and tear the roof. Fixing these small things early is a big part of extending commercial roof life. It keeps water out of the insulation, which is costly to replace once it gets soaked.

• Metal edge flashing that is loose, bent or missing fasteners along the roof's rim.
• Air conditioning units and vents with slack straps, missing bolts or rusted anchors.
• Flashing around pipes, vents and skylights, where holes are cut through the roof.
• On metal warehouse roofs, loose screws and panel overlaps that have opened up.

How Foot Traffic and Rooftop Work Can Affect Your Warranty

Every person who walks the roof adds wear, and some changes can put your warranty at risk. IKO asks owners to keep a record of who went on the roof, when and what they did. It also says to contact the manufacturer before adding new pipes, curbs, rooftop units or solar panels. A curb is a raised frame that holds equipment up off the roof. Skip that call, and the manufacturer's warranty coverage could end.

Restaurants need extra care on the roof, mainly around the kitchen fans. Grease from kitchen exhaust fans can soften and break down many roof membranes over time. IKO says to clean grease off restaurant roofs every month and to put a sacrificial sheet under each fan. That is a spare layer that soaks up the grease so the main roof does not. Some makers also offer membranes built to resist grease, which can suit a restaurant roof.

Keep a Roof File for Your Building

ARMA advises a roof file with the install date, roof plan, membrane type, parts list and warranty. Add the contractor and manufacturer names, plus notes and photos from every inspection and repair. IBHS notes that good records can support an insurance claim after a storm. The file also helps a new property manager learn the roof's history quickly and plan ahead.

• Lock roof hatches and log every visit, including contractors who service rooftop units.
• Call the roof maker or your roofer before anyone cuts a new opening in the roof.
• Ask your kitchen exhaust cleaner to remove grease from the roof around each fan.

When to Call a Roofer and How to Prep for Storm Season

Call a roofer as soon as you see a leak, a wet ceiling tile or a lifted seam. Some warranties set a time limit for leak reports, and IKO's guide asks for one within 30 days. Call after any major storm too, even if nothing drips inside right away. Your spring inspection should land before hurricane season starts on June 1. IBHS warns against loose stone ballast, the gravel that holds some roofs down, in hurricane areas.

A business roof holds up longest when small jobs get done on time. Your staff keeps the surface clean, the drains open and the log current. A roofer looks after the edges, seams, flashing and equipment ties twice a year and after storms. Each visit then builds on the last one, and problems show up while they are still small. That routine keeps water out of your building and helps you meet your warranty's care terms.