How long can water sit on a flat roof before it's a problem?

The Florida Building Code's definition of positive roof drainage is a roof that drains within 48 hours of rain. Water still standing after two days is the sign to call. It adds weight, finds every weak seam, and in the HVHZ a repair isn't allowed to make the ponding any worse than it was.

What does it cost to fix a leaking flat roof?

National guides split it three ways: $150 to $500 for sealing a small crack or loose spot, $500 to $1,200 for several leaks that need new membrane, and $1,200 to $3,000 when water has damaged the roof structure underneath. Ask whether tracing the entry point is included in the price.

Should I coat my flat roof instead of repairing it?

Repair first, then coat. Cost guides describe a coating as the last step after the patching is done, not a substitute for it. A coating over an open seam or a wet spot just hides the problem. Once the repairs are in, guides credit a coating with 7 to 10 more years on a weathered roof that's otherwise sound.

Flat Roof Repair in Pompano Beach, FL

Typical cost: cost guides put most flat roof repairs at $300 to $1,100, or $2.50 to $10 a square foot.
Leaks: $150 to $500 for minor sealing, $500 to $1,200 when membrane has to be replaced.
Drainage test: a sound low-slope roof drains within 48 hours of rain.
Repair or replace: guides suggest replacing a flat roof 10 to 15 years old that needs extensive repairs.

Pompano Beach Roofers sends flat roof repair requests on to a contractor who does flat-roof work. The jobs are standing water, blistered or split cap sheet, seams and edge metal that have let go, and the low-slope roofs over Florida rooms, porches and carports.

Flat Roof Repair by Problem

A shallow pool of standing water in a low spot on a gray flat roof near a parapet wall

Ponding water and blocked drains

The code's own yardstick is drainage within 48 hours of rain, and HVHZ rules say a repair can't create more ponding than the roof had. A clogged drain or scupper is the cheap fix. A sagging section is not. Guide prices:

clearing or adding a roof drain: $70 to $340
sagging or pooling repair: $800 to $2,500 for up to 100 square feet

A raised blister and fine cracks in the granulated cap sheet of a modified bitumen flat roof

Blisters, splits and cracked cap sheet

Blisters are pockets where the layers have pulled apart. Splits and alligator cracking come from sun, weather and age, which is a short list in South Florida. Guides put this repair at $250 to $1,250. If the roof is later recovered rather than torn off, the code requires every blister to be cut and repaired before the new system goes on, so a patch now isn't wasted.

An open seam between two sheets of light gray flat roof membrane, with the edge lifting

Open seams and failed edge flashing

Cracks or punctures in the membrane, worn seams and flashing, and clogged drains are the usual leak sources on a flat roof. Flashing repair typically runs $200 to $500. Edge metal and terminations on low-slope roofs in Broward follow the RAS 111 standard, so ask whether a loose drip edge will be refastened to that detail or only caulked. Welded TPO seams have their own method; see TPO roofing.

The low-slope roof of a screened Florida room attached to the back of a stucco home

Florida room, porch and carport roofs

These additions are often pitched too low for shingles, which need 2:12 in the HVHZ, so they carry a membrane instead. New low-slope decks need at least 1/4 inch of fall per foot. That rule covers new construction, so a 1970s porch roof in Cresthaven can have less fall than that and hold water against the house wall. Repairs here are still permitted roofing work; roof repair covers the permit.

A roofer's gloved hands pressing on the rubber pipe boot flashing of a vent on a gray shingle roof

Why Pompano Beach homeowners call Pompano Beach Roofers

Calling or sending the form costs you nothing
Your request goes to one roofer, not a list of bidders
Ask for tear-off, deck work and the permit on one itemized quote
Get the roofer's CC or RC license number and check it yourself

Flat Roof Repair or Replacement: Where the Line Falls

Age
Cost guides suggest replacing rather than repairing a flat roof that's 10 to 15 years old and needs extensive work.
Repair cost by membrane
Guides list $2 to $9 a square foot to repair TPO and $3 to $8 for modified bitumen, so a large repair area quickly approaches the price of new.
Recover as a middle step
Coating, resealing or a membrane recover runs $500 to $2,000 on a typical job. A recover only works if the roof underneath passes the code's moisture and uplift tests; flat roof replacement explains them.
Section size
A big repair on an older roof can hit Florida's 25% rule and turn into a full re-roof of that section.

Ask for photos of the damage and the repair area marked on a sketch, so you can see what the price covers.

See roof coating for what to put on the roof once the repairs are done.