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Gutters · Hillsborough County

Gutters in Hillsborough County, FL

Tampa International Airport logs 49.48 inches of rain in a normal year, but gutters in Hillsborough County have to handle the bursts: NOAA Atlas 14 puts Tampa's 10-year, 5-minute rate at 9.61 inches an hour. An older sizing table, built on records through 1978, listed Tampa at 8.3 inches an hour.

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Updated October 2026

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.

Gutters in Hillsborough County, in short

Florida's code requires gutters only where eaves project less than 6 inches, with downspouts discharging at least 1 foot from the wall. Beyond that, size for Tampa's burst rate rather than the yearly total: at 9.61 inches an hour, a 6-inch half-round gutter at a 1/8-inch slope drains about 1,100 square feet of roof plan area.

Sources for this answer

Rain

9.61 inches an hour: sizing for Tampa's 5-minute burst

Gutter tables work from short, intense rain, not annual totals. The SMACNA-style table a gutter maker reproduces is based on records through 1978 and gives Tampa's 10-year, 5-minute intensity as 8.3 inches an hour. NOAA Atlas 14, the current federal estimate, puts the same storm at 9.61 at Tampa, about 16% higher.

Here is what that does to capacity, with the inputs shown. The plumbing code rates a 6-inch half-round gutter at a 1/8-inch-per-foot slope at 110 gallons a minute, and 96.15 square feet of roof under 1 inch an hour of rain sheds 1 gallon a minute. At 9.61 inches an hour, that gutter serves about 1,100 square feet of plan area. On a 100-year, 1-hour basis, the kind the plumbing code uses for storm drainage, Atlas 14 gives Tampa 3.96 inches an hour, and the same gutter serves about 2,670.

Pitch adds area too: a roof sloped 6 to 8 inches per foot counts its plan area times 1.10. The design basis you pick changes the answer by more than double.

Storm rain

Debby, Eta and a wetter east county

Storm totals here can run high. Debby left 10 to 15 inches near and south of Tampa Bay in August 2024, and Eta dropped up to 10.64 inches near Sun City Center in November 2020. For comparison, Atlas 14's design depths at Tampa are 6.24 inches in 24 hours for a 10-year storm and 11.3 inches for a 100-year storm.

Rain also rises toward the east. The Plant City station averages about 56.1 inches a year, against 49.48 at Tampa International Airport, where about 61% falls June through September. Enter your roof size below to see what a 10-year, 24-hour storm at Tampa puts on it.

Rain on your roof

Preset: 6.24 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Tampa).

7,775 gallons run off that roof, all of it toward the gutters and downspouts.

Math: square feet × inches × 0.623 gallons.

Code

Downspouts, the 1-foot rule and where the water goes

The residential code requires gutters with downspouts where eaves project less than 6 inches, except at gable-end rakes or over a lower roof. Every downspout must discharge at least 1 foot from the wall, by underground pipe, extension or splash block (R318.5; FBC-B 1503.7).

Downspouts have ratings of their own: a 3-inch round or 2½ by 3-inch leader carries 92 gallons a minute, and a 4-inch round carries 192 (FBC-P Table 1106.3).

Water covers 23.5% of Hillsborough's total area, from Tampa Bay to the county's lakes and rivers. On a waterfront or low lot, decide where each downspout sends its water before the gutters go up.

Upkeep

Gutter metals, fasteners and a cleaning rhythm

The code allows gutters of metal or approved plastic, with lapped, soldered or caulked joints and corrosion-resistant fasteners of a material compatible with the gutter (R903.4.2).

A Florida home insurer advises cleaning at least twice a year, in spring and fall, and more often under overhanging trees or after storms. Southern live oaks drop leaves and fruit, pollen peaks in March and April, and pine needle fall is heaviest from September through November, so late spring and late fall line up with the debris.

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Questions

Gutters in Hillsborough County: questions

What size gutters do Hillsborough County homes need?

It depends on roof area, pitch and the rain rate you design for. At Tampa's Atlas 14 burst of 9.61 inches an hour, a 5-inch half-round gutter at a 1/8-inch slope drains about 740 square feet of plan area and a 6-inch about 1,100, from the plumbing code's ratings of 74 and 110 gallons a minute. A large or steep roof needs more downspouts, more runs or a bigger gutter to keep up, so measure before you choose.

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Are gutters required on houses in Hillsborough County?

Not on every house. Florida's residential code calls for them only where eaves project less than 6 inches, leaving out gable-end rakes and roofs that sit above another roof (R318.5). Hillsborough's summer pattern still argues for them: about 61% of the 49.48 inches Tampa International Airport records in a normal year arrives June through September, the rainy season of near-daily thunderstorms.

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How much water does a Hillsborough roof shed in a downpour?

About 200 gallons a minute for a roof with 2,000 square feet of plan area, in Tampa's 10-year, 5-minute burst of 9.61 inches an hour. That figure uses the industry conversion of 96.15 square feet per gallon a minute at 1 inch an hour. One 6-inch half-round gutter at a 1/8-inch slope is rated for 110, and a 3-inch round downspout for 92, so that roof needs at least two runs and three such downspouts.

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How should gutters be hung for hurricane season in Hillsborough?

Closer together, with clips. One hidden-hanger maker's standard spacing is 24 inches on center, and for storm-prone areas it recommends 16-inch spacing with its clip option for more uplift resistance. The code adds that fasteners must resist corrosion and match the gutter material (R903.4.2). After a season that brought Debby, Helene and Milton to the county, walk the runs for sags and pulled hangers before the next one.

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Hillsborough County

More in Hillsborough County

Sources for this page(50)
  1. 1.NOAA NCEI U.S. Climate Normals 1991-2020, station USW00012842 TAMPA INTL AP. Read Oct 5, 2026.
  2. 2.NOAA NCEI U.S. Climate Normals 1991-2020, station USC00087205 PLANT CITY. Read Oct 5, 2026.
  3. 3.Hurricane Debby (2024). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Debby. Read Oct 5, 2026.
  4. 4.Hurricane Eta (2020). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Eta. Read Oct 5, 2026.
  5. 5.Water share of total area: 23.5%. U.S. Census Bureau TIGERweb Census 2020 county geography (AREAWATER / total); includes bay and Gulf waters inside the county boundary. Read Oct 5, 2026.
  6. 6.Hurricane Helene (2024). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Helene. Read Oct 5, 2026.
  7. 7.Hurricane Milton (2024). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Milton. Read Oct 5, 2026.
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  9. 9.2023 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").
  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).
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  22. 22.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Helene. Read Oct 5, 2026.
  23. 23.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Milton. Read Oct 5, 2026.
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  38. 38.Wikipedia articles for each place (secondary). Read Oct 5, 2026.
  39. 39.Senate SB 808 staff analysis pp. 3-4. Read Oct 5, 2026.
  40. 40.Florida Building Commission, "Florida Building Code Effective Dates". Read Oct 5, 2026.
  41. 41.FBCR Ch. 9. Read Oct 4, 2026.
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  47. 47.FBC-Building 2023 Chapter 2 definitions. Read Oct 5, 2026. Unofficial transcription; verify on floridabuilding.org.
  48. 48.OIR form. Read Oct 4, 2026.
  49. 49.FBCR Ch. 2. Read Oct 5, 2026.
  50. 50.NOAA Atlas 14 at Tampa: 9.61 in/hr (5-minute, 10-year). NOAA Atlas 14 Volume 9 (Southeastern States) version 2, partial-duration series point estimates, via the HDSC PFDS endpoint (ops/research/v3/services/data/noaa-atlas14-florida-rainfall.tsv). Read Oct 5, 2026.

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Gutters in Hillsborough County

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