Flat roof maintenance checklist: what to check each season

Why does a flat roof need a schedule?

A sloped roof sheds water and debris on its own. A flat roof relies on a few drains or scuppers, so one clogged outlet can turn a small defect into a leak. Most flat roof failures start at the same places: drains, edges, seams and anything that pokes through the membrane. A short, regular routine catches them while they are still cheap to fix.

The National Roofing Contractors Association has long advised inspecting roofs at least twice a year, in spring and fall, and after severe weather such as a hurricane or hailstorm. In Florida, the calendar gives you two natural deadlines: the start of the rainy season and the start of hurricane season.

How do you get on the roof safely?

Many homeowners can do most of this checklist from a ladder at the roof edge. If you do go up:

• Use an extension ladder that reaches at least 3 feet above the roof edge, set at about one foot out for every four feet up. That’s OSHA’s ladder rule, and it’s a good homeowner rule too.
• Stay well back from unprotected edges, and treat skylights as holes in the roof. OSHA’s fall rules for workers count skylights as holes that need guarding.
• Don’t go up in wind, lightning or rain, or when the surface is wet with dew. Many membranes are slick when wet.
• Walk on the membrane gently. Stay off soft or spongy spots, which can mean wet insulation or a damaged deck.

What should you do each season?

The National Weather Service office in Miami dates South Florida’s rainy season from May 15 to October 15 and says it brings 60–70% of the average yearly rainfall. The National Hurricane Center lists the Atlantic season as June 1 to November 30, with most activity between mid-August and mid-October. Outside Florida, keep the same twice-a-year rhythm and add checks before and after your local storm season.

What’s on the twice-a-year checklist?

Drainage

• Drain strainers in place and clear; water runs freely when you run a hose.
• Scupper openings clear, and conductor heads and downspouts unclogged.
• Gutters clean, securely attached and sloped toward downspouts.
• No dirt rings or debris lines showing where water sits (signs of ponding).

Edges and flashing

• Edge metal and gravel stop flat and tight, with no lifted sections.
• Wall and parapet flashing sealed at the top, with no gaps behind it.
• Parapet caps secure, joints sealed, no rust.

Seams and surface

• Mod bit: laps closed, granules intact, no blisters or alligatoring.
• BUR: gravel evenly spread, no bare spots or splits.
• TPO/PVC: welds intact, no cracks or punctures.
• EPDM: seam tape flat, no shrinkage pulling at corners and edges.
• Spray foam: coating intact, no exposed tan or crumbling foam, no bird damage.
• Coated roofs: no peeling, chalking through to the base, or bare spots.

Penetrations and equipment

• Pipe boots, vents and exhaust fans sealed and undamaged.
• Skylight curbs flashed and lenses intact.
• AC stands and curbs stable, condensate draining off the roof rather than pooling.
• No old screws, cable ties or tools left by other trades. These puncture membranes.

Inside

• No new stains, peeling paint or musty smells at ceilings and the tops of walls.

What should you not do yourself?

Cleaning and looking are owner tasks. Cutting out blisters, re-welding seams, re-flashing walls, adding drains and applying a full coating system are roofing work. In Florida, roofing (including coatings sold to protect or extend a roof’s life) falls within the licensed roofing contractor’s scope under state law. Small sealant touch-ups with a compatible product are reasonable for a careful homeowner. Our guides to patching a leak and flashing and seams explain where the line is.

Avoid pressure washing. High pressure can strip granules, drive water under laps and void a coating or membrane warranty. Use a soft broom, a garden hose and a cleaner approved by the membrane or coating manufacturer.

When does the checklist turn into a call to a roofer?

• Any active leak, or a stain that grows after rain.
• Open seams or laps longer than a few inches, or flashing pulled away from a wall.
• Soft, spongy areas or blisters that are spreading.
• Ponding that remains after you have cleared every drain.
• Exposed foam on an SPF roof, or a coating worn through to the base.
• Any damage after a named storm. See our hurricane prep and storm damage guide for documenting it first.

A professional inspection typically costs $125–$600, depending on whether it includes a drone or infrared moisture scan. Details are in flat roof inspection cost.

What records should you keep?

Make a single folder, paper or digital, with your reroof permit and final inspection, the contract, product approval or Miami-Dade NOA numbers, manufacturer and workmanship warranties, every repair invoice, and dated photos from each inspection. Florida insurers can ask about roof age and condition, and warranty claims often require proof of maintenance. That folder is how you answer quickly.