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Gutters · San Antonio

Gutters in San Antonio, FL

A 5-minute downpour in a 10-year storm falls at 9.43 inches an hour in San Antonio, according to NOAA Atlas 14. That is a short, hard burst, and gutters and downspouts in this town have to carry it without overflowing onto the walls and foundation.

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Updated October 2026

Small stone City Hall building with a hipped roof, arched entrance and landscaped shrubs on a sunny day.
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: San Antonio FL city hall01 by Ebyabe, CC BY-SA 3.0, cropped

Sizing for the storm

Sizing San Antonio gutters for a short, hard burst

Gutter size follows the rain rate, not the yearly total. Here the 1-hour, 10-year rain falls at 2.88 inches an hour, and the 24-hour, 10-year storm drops 7.03 inches. A gutter has to pass the short, intense burst, so the 5-minute figure drives the choice.

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

The plumbing code sizes horizontal gutters from the flow off the roof and the slope of the run. A 6-inch half-round gutter at one-eighth inch per foot carries about 110 gallons a minute, while a 5-inch one carries 74. By our arithmetic, the 6-inch size gives about 49 percent more capacity for the same slope.

Pitch matters too. The code multiplies the roof's plan area by a factor that rises with steepness, from 1.00 for a low slope up to 1.30 at 12 in 12. Measure the flat footprint of each roof section and apply that factor before choosing a size.

Getting water away

Downspouts, discharge and where the water goes

Keep downspout outlets at least 1 foot away from the wall they drain. The water can run through underground pipe, a tail extension or a splash block, but it cannot pool against the foundation. Many older homes here were built around 1996, so their original downspouts may end right at the wall.

  • Check that every downspout points at least a foot from the wall.
  • Confirm each leader is sized to its roof section, not just the gutter.
  • Add the area of any wall that sheds rain onto the roof when sizing.

Hangers and seams take the weight of a full gutter after a storm. On older San Antonio roofs, check that each joint is still sealed and each hanger still holds, since a sagging run dumps rain onto the fascia.

Keeping gutters clear

Leaves, pine needles and cleaning schedule

Live oaks drop leaves and fruit as a litter problem. Pollen runs from January to June, peaking in March and April, and pine needles fall heaviest from September through November. Clogged gutters overflow in the first heavy rain, so plan cleaning around those seasons.

Insurers advise cleaning gutters at least twice a year, and more often under overhanging trees or during frequent storms. Under heavy canopy a sensible rhythm is after the spring oak drop, before the June to September storm season, and after the autumn needle peak.

Rain on your roof

Preset: 7.03 inches, the 10-year 24-hour rain (NOAA Atlas 14 at San Antonio).

8,759 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 San Antonio: questions

How hard does it rain in San Antonio, FL?

A 5-minute downpour in a 10-year storm falls at 9.43 inches an hour in San Antonio, according to NOAA Atlas 14. The 1-hour, 10-year rain falls at 2.88 inches an hour, and a 24-hour, 10-year storm brings 7.03 inches. Gutters here must move short, intense bursts without overflowing. Gutter sizing should use the 5-minute figure rather than the yearly total, so ask a contractor which storm basis their sizing uses.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the San Antonio 2020 Census internal point (28.3395, -82.2786), read Oct 5, 2026

Related: Gutters

How far should a downspout discharge from my house in San Antonio?

Under the state's residential code, the outlet of each downspout has to sit no closer than 1 foot to the sidewall. The water can leave through underground piping, a tail extension or a splash block. In San Antonio, where the typical home was built around 1996, many original downspouts may end at the wall, so check them after each storm. Confirm the details with the Dade City Building Department, which handles permits for San Antonio.

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

Related: Gutters

How often should gutters be cleaned near oak and pine trees in San Antonio?

Insurers advise cleaning gutters at least twice a year, typically in spring and fall, and more often under overhanging trees or during frequent storms. In Pasco County, where 77.4 days a year bring at least 0.10 inch of rain at Saint Leo, debris builds up fast. Clean after the spring oak drop, before the June to September storm season, and after the autumn needle peak.

Source: thig.com, read Oct 5, 2026

Related: Gutters

Nearby

Gutters near San Antonio

Sources for this page(33)
  1. 1.Median year homes were built: 1996. U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, via Census Reporter API (release acs2024_5yr). Read Oct 5, 2026.
  2. 2.City of San Antonio, Building Permits (read via WebFetch). Read Oct 5, 2026.
  3. 3.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25034, B01001, via Census Reporter API (release acs2024_5yr). Read Oct 5, 2026.
  4. 4.NOAA NCEI U.S. Climate Normals 1991-2020, station USC00087851. Read Oct 5, 2026.
  5. 5.Hurricane Hermine (2016). NHC TCR AL092016; FEMA OpenFEMA DisasterDeclarationsSummaries v2 (designatedArea = county). Read Oct 5, 2026.
  6. 6.Hurricane Irma (2017). NOAA NCEI Storm Events Database, event 721945 (Tropical Storm, 2017-09-10, zone/county INLAND PASCO), bulk details file; FEMA OpenFEMA DisasterDeclarationsSummaries v2 (designatedArea = county). Read Oct 5, 2026.
  7. 7.Pasco County, Coastal Management. Read Oct 5, 2026.
  8. 8.bergerbp.com. Read Oct 5, 2026.
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  10. 10.2023 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).
  11. 11.2023 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").
  12. 12.2023 Florida Building Code, Residential, 8th ed., Chapter 9 (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-29 (the research cites it "as COM-29").
  13. 13.Gutterall 6K hanger. Read Oct 5, 2026.
  14. 14.ask.ifas.ufl.edu. Read Oct 5, 2026.
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  16. 16.ufdcimages.uflib.ufl.edu. Read Oct 5, 2026.
  17. 17.thig.com. Read Oct 5, 2026.
  18. 18.NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the San Antonio 2020 Census internal point (28.3395, -82.2786), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  19. 19.NOAA Atlas 14 Volume 9 version 2, partial-duration 24-hour depth estimates at the San Antonio 2020 Census internal point (28.3395, -82.2786), NOAA Hydrometeorological Design Studies Center. Read Oct 5, 2026.
  20. 20.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, via Census Reporter API (release acs2024_5yr), U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  21. 21.NHC TCR AL092016; FEMA OpenFEMA DisasterDeclarationsSummaries v2 (designatedArea = county), NOAA National Hurricane Center. Read Oct 5, 2026.
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  23. 23.U.S. Census Bureau, 2020 Census counts (POP100/HU100) and 2020 TIGER land/water area, via TIGERweb tigerWMS_Census2020 layer 26 (2020 Census count), U.S. Census Bureau. Read Oct 5, 2026.
  24. 24.Citizens Property Insurance Corporation, inspections FAQ (updated 2026-03-17), Citizens Property Insurance. Read Oct 4, 2026.
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  27. 27.City of Dade City Building Department, under a local agreement with the City of San Antonio, City of Dade City Building Department. Read Oct 5, 2026.
  28. 28.2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  29. 29.2023 Florida Building Code, Building, 8th ed., Chapter 1 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  30. 30.NOAA NCEI Storm Events Database, event 1058671 (Tropical Storm, 2022-09-28, zone/county COASTAL PASCO), bulk details file, NOAA National Centers for Environmental Information. Read Oct 5, 2026.
  31. 31.FRSA, "New 2023 FBC Eighth Edition is Now in Effect", 2024-02-13, floridaroof.com. Read Oct 5, 2026.
  32. 32.Miami-Dade County RER notice, Miami. Read Oct 5, 2026.
  33. 33.NOAA Atlas 14 at San Antonio: 9.43 in/hr (5-minute, 10-year). NOAA Atlas 14 Precipitation Frequency Data Server. Read Oct 5, 2026.

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Gutters in San Antonio

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