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Gutters · Treasure Island

Gutters in Treasure Island, FL

In a 10-year storm, a 5-minute downpour in Treasure Island falls at 9.97 inches an hour. Gutters here are sized for bursts like that, not for average rain. An undersized run or a downspout that dumps against the wall can spill water onto the foundation within minutes.

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Updated October 2026

A Treasure Island beach park sign stands beside palm trees, a white pavilion, and a walking path.
Drone view of a single-story home with a brown-gray shingle roof and box vents under large oak trees, a metal carport roof in the corner and a street behind.Our work
Photo: Sunset Beach,Treasure Island,Florida. by Roman Eugeniusz, CC BY-SA 3.0, cropped

Sizing for local rain

How much water a Treasure Island roof has to move

The short bursts matter most for gutters. A 1-hour rain in a 10-year storm reaches 2.83 inches an hour, and a 100-year storm pushes the 24-hour total to 13.5 inches. Gutter sizing has to handle the peak rate, not the daily total.

The same house in the same downpour with a white seamless gutter catching the runoff and a downspout discharging onto a splash block, flower bed intact (illustration)Illustration

Illustration: downpour with gutter

On a roof this exposed, with only about three feet of island elevation under it, the wider 6-inch half-round profile gives the margin. At 1/8 inch per foot it moves roughly 110 gallons per minute, and the 5-inch size moves 74. The wider profile carries about 49 percent more water.

Pitch and wall area add load. Pitched roofs use a larger design factor, and the code adds half the area of any vertical wall that sheds rain onto the roof. Walls that drain onto a Treasure Island roof count toward the gutter size.

Discharge rules

Downspouts and where the water goes

Eaves on a Treasure Island home that project less than 6 inches need gutters with downspouts under the residential code. Each leader must carry water at least 1 foot off the sidewall, using underground piping, tail extensions or splash blocks.

  • A 2 by 3 inch leader handles about 30 gallons per minute, far below a 6-inch run.
  • A 3 inch round leader handles about 92 gallons per minute.
  • Pick leader size against the gutter that feeds it, not by eye.

On a barrier island built partly on dredged fill toward Boca Ciega Bay, a downspout that stops at the foundation sends water toward the lowest point of the lot. Extend every leader beyond the 1-foot line.

Keeping gutters clear

Leaves, pollen and cleaning on Treasure Island

Southern live oaks drop leaves and fruit as a litter problem, and oaks are among the major pollen producers in Florida, peaking in March and April. Cleaning in late April and May, before the June to September storm season, catches most of that load.

Pine needles add a second load, with the heaviest drop from September through November. An insurer's guidance calls for cleaning at least twice a year and more often under overhanging trees.

Of Treasure Island's occupied homes, 74.4 percent are owner-occupied, so most gutter cleaning here falls to the person who lives under the roof.

Rain on your roof

Preset: 7.36 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Treasure Island).

9,171 gallons run off that roof, all of it toward the gutters and downspouts.

Math: square feet × inches × 0.623 gallons.

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Questions

Gutters in Treasure Island: questions

How hard does it rain in Treasure Island during a storm?

In a 10-year storm, a 5-minute downpour in Treasure Island falls at 9.97 inches an hour. A 25-year storm reaches 11.3 inches an hour. Those short peaks decide whether a gutter overflows, so they are the number to size against. For a 24-hour storm, the 10-year total is 7.36 inches and the 100-year total is 13.5 inches. Confirm current design rates with the City of Treasure Island Building Division.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Treasure Island 2020 Census internal point (27.7640, -82.7688), read Oct 5, 2026

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How big should my gutters be in Treasure Island?

Size from your own roof's flow, not from the street. The plumbing code table lists a 5-inch half-round at 74 gallons per minute and a 6-inch at 110, both at 1/8 inch per foot. Pitched roofs and walls that drain onto the roof add to the design load. With a 10-year burst of 9.97 inches an hour here, the larger size is the safer choice. The City of Treasure Island Building Division can confirm what applies to your house.

Source: 2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription), read Oct 5, 2026

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Where should my downspouts send the water?

The residential code requires downspouts to discharge at least 1 foot from the sidewall, by underground piping, tail extensions or splash blocks. On Treasure Island, with about three feet of elevation, water left near the foundation has nowhere low to go. Extend leaders past that 1-foot line and check the grade after heavy rain.

Source: 2023 Florida Building Code, Residential, 8th ed., R318.5 (UpCodes viewer, unofficial transcription); FBC-Building 1503.7, read Oct 5, 2026

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How often should I clean gutters near oaks on Treasure Island?

Clean in late April and May, before the June to September storm season, and again after the autumn pine-needle peak from late November to December. Insurer guidance says to clean at least twice a year, more often under overhanging trees. Pinellas County normals show about 62 to 63 percent of the 52.48 inches of yearly rain falling June through September, so a clear gutter before June matters most.

Source: ask.ifas.ufl.edu, read Oct 5, 2026

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Nearby

Gutters near Treasure Island

Sources for this page(33)
  1. 1.Wikipedia, "Treasure Island, Florida" (secondary source). Read Oct 5, 2026.
  2. 2.Town of Indian Shores; City of Treasure Island (official). Read Oct 5, 2026.
  3. 3.NOAA NCEI U.S. Climate Normals 1991-2020, stations USC00087886 ST PETERSBURG and USW00012873 ST PETERSBURG INTL AP. Read Oct 5, 2026.
  4. 4.Owner-occupied share of occupied homes: 74.4%. U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25003, via Census Reporter API. Read Oct 5, 2026.
  5. 5.Permit office: City of Treasure Island - Building Division. City of Treasure Island - Building Division. Read Oct 10, 2026.
  6. 6.Hurricane Hermine (2016). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Hermine. Read Oct 5, 2026.
  7. 7.2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from COM-20 (the research cites it "as COM-20").
  8. 8.bergerbp.com. Read Oct 5, 2026.
  9. 9.2023 Florida Building Code, Residential, 8th ed., R318.5 (UpCodes viewer, unofficial transcription); FBC-Building 1503.7. Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7).
  10. 10.2023 Florida Building Code, Residential, 8th ed., Chapter 8 (UpCodes viewer, unofficial transcription). Read Oct 5, 2026. FBC text read from UpCodes (unofficial transcription): check floridabuilding.org or the ICC viewer before quoting (spec 8.7). Source URL inherited from NC-2 (the research cites it "as NC-2").
  11. 11.ask.ifas.ufl.edu. Read Oct 5, 2026.
  12. 12.blogs.ifas.ufl.edu. Read Oct 5, 2026.
  13. 13.ufdcimages.uflib.ufl.edu. Read Oct 5, 2026.
  14. 14.thig.com. Read Oct 5, 2026.
  15. 15.NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Treasure Island 2020 Census internal point (27.7640, -82.7688), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  16. 16.NOAA Atlas 14 Volume 9 version 2, partial-duration 24-hour depth estimates at the Treasure Island 2020 Census internal point (27.7640, -82.7688), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  17. 17.U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25003, via Census Reporter API, U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  18. 18.City of Treasure Island - Building Division, City of Treasure Island. Read Oct 5, 2026.
  19. 19.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Hermine, NOAA National Hurricane Center. Read Oct 5, 2026.
  20. 20.U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25034, via Census Reporter API, U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  21. 21.Citizens Property Insurance Corporation, inspections FAQ (updated 2026-03-17), Citizens Property Insurance. Read Oct 4, 2026.
  22. 22.2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  23. 23.2023 Florida Building Code, Building, 8th ed., Chapter 1 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  24. 24.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Helene, NOAA National Hurricane Center. Read Oct 5, 2026.
  25. 25.Wikipedia, "Pinellas County, Florida" (secondary), Wikipedia. Read Oct 5, 2026.
  26. 26.Pinellas County, "Building Departments in Pinellas County" (official), Pinellas County. Read Oct 5, 2026.
  27. 27.City of St. Pete Beach; Town of Redington Shores; City of Largo (official), City of St. Pete Beach. Read Oct 5, 2026.
  28. 28.City of St. Petersburg; City of Tarpon Springs (official); Wikipedia (St. Pete Beach), City of St. Petersburg. Read Oct 5, 2026.
  29. 29.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma, NOAA National Hurricane Center. Read Oct 5, 2026.
  30. 30.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Eta, NOAA National Hurricane Center. Read Oct 5, 2026.
  31. 31.City of Treasure Island, Building Division (official), City of Treasure Island. Read Oct 5, 2026.
  32. 32.Miami-Dade County RER notice, Miami. Read Oct 5, 2026.
  33. 33.NOAA Atlas 14 at Treasure Island: 9.97 in/hr (5-minute, 10-year). NOAA Atlas 14 Precipitation Frequency Data Server. Read Oct 5, 2026.

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Gutters in Treasure Island

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