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Gutters · Keystone

Gutters in Keystone, FL

In Keystone, with 9,697 housing units, a 5-minute downpour in a 10-year storm falls at 9.86 inches an hour. That burst is the rate a gutter has to carry at its worst, not the average rain. Most of those homes are single-family, so the gutters sit on houses where the water has to leave the lot safely.

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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.

Keystone figures this page uses

Median year homes were built
1999
Housing units (ACS 5-year)
9,697
Single-family detached share of housing units
89.6%
Owner-occupied share of occupied homes
92.1%

Sizing for the burst

Sizing Keystone gutters for the short, hard burst

Gutters are sized for a burst, not for a steady rain. At Keystone's NOAA Atlas 14 rates, a 10-year storm drops 2.9 inches in one hour and 6.93 inches in 24 hours. A gutter that carries a steady drizzle can still overflow in the first minutes of a hard storm.

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

Keystone's 1999-era homes were built with the older sizing in mind, and a 5-inch half-round gutter carries about 74 gallons per minute at a 1/8 inch per foot slope. A 6-inch gutter at the same slope carries about 110. That is roughly 49 percent more capacity, and it is the first upgrade worth asking a roofer about on a long roof run.

Discharge and code

Where downspouts must discharge on Keystone lots

Florida's residential code requires downspouts to discharge at least 1 foot from the building's sidewall, by underground piping, tail extensions or splash blocks. On a Keystone lot where the land slopes toward a lake or a low corner, that one foot is the difference between water moving off the house and water soaking the foundation.

Keystone's 10.3 percent water coverage means many lots sit near standing water. Pick a downspout size from the burst rate above, and make sure each leader drains to a place the water can leave the lot.

Rain on your roof

Preset: 6.93 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Keystone).

8,635 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 Keystone: questions

How much rain does Keystone get in a storm?

A 10-year storm in Keystone drops rain at 9.86 inches an hour over five minutes, based on NOAA Atlas 14 for this town. A 1-hour 10-year storm brings 2.9 inches, and a 24-hour 10-year storm brings 6.93 inches. Those are the numbers gutters and downspouts have to handle. Gutters that work for a steady rain can overflow during a short hard burst, so ask a roofer to size them for the burst rate.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Keystone 2020 Census internal point (28.1278, -82.6080), read Oct 5, 2026

Related: Gutters

How many downspouts does a Keystone house need?

The code sizes downspouts by the roof area they drain, not by a fixed count. Table 1106.3 lists a 3 by 4 1/4 inch or 4 inch round leader at 192 gallons per minute, and the plumbing code says to add half the area of any vertical wall that sheds rain onto the roof. In Keystone, where a 10-year storm falls at 9.86 inches an hour, measure your roof and walls, then ask the Hillsborough County building office to confirm leader sizes for your home.

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

Related: Gutters

Do I need gutters on a Keystone home?

Florida's residential code asks for gutters where a building's eaves project less than 6 inches, skipping gable end rakes and roofs that sit above another roof. Keystone's 92.1 percent owner-occupied share means most homes are lived in by their owners, who should check their own eave depth. The Hillsborough County building office can confirm the rule for your roof.

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

Related: Gutters

Nearby

Gutters near Keystone

Sources for this page(31)
  1. 1.Median year homes were built: 1999. U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25035, via Census Reporter API. Read Oct 5, 2026.
  2. 2.Wikipedia, "Keystone, Florida" (secondary source). Read Oct 5, 2026.
  3. 3.Permit office: Hillsborough County - Building Permits & Records (unincorporated Hillsborough County). Hillsborough County - Building Permits & Records (unincorporated Hillsborough County). Read Oct 10, 2026.
  4. 4.Wikipedia, "Hillsborough County, Florida" (secondary). Read Oct 5, 2026.
  5. 5.U.S. Census Bureau, Census 2020 place geography (AREALAND/AREAWATER) via TIGERweb tigerWMS_Census2020. Read Oct 5, 2026.
  6. 6.Housing units (ACS 5-year): 9,697. U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25001, via Census Reporter API. Read Oct 5, 2026.
  7. 7.Single-family detached share of housing units: 89.6%. U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25024, via Census Reporter API. Read Oct 5, 2026.
  8. 8.Owner-occupied share of occupied homes: 92.1%. U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25003, via Census Reporter API. Read Oct 5, 2026.
  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., 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. 11.2023 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).
  12. 12.2023 Florida Building Code, Residential, 8th ed., Chapter 3 (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).
  13. 13.NOAA Atlas 14 (HDSC Precipitation Frequency Data Server). Read Oct 5, 2026.
  14. 14.bergerbp.com. Read Oct 5, 2026.
  15. 15.NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Keystone 2020 Census internal point (28.1278, -82.6080), 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 Keystone 2020 Census internal point (28.1278, -82.6080), 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.Hillsborough County - Building Permits & Records (unincorporated Hillsborough County), Hillsborough County. Read Oct 5, 2026.
  19. 19.U.S. Census Bureau, ACS 2024 5-year (2020-2024), table B25024, via Census Reporter API, U.S. Census Bureau (via Census Reporter). Read Oct 5, 2026.
  20. 20.Wikipedia (Riverview, Brandon); U.S. Census Bureau ACS 2020-2024 table B25034, Wikipedia. Read Oct 5, 2026.
  21. 21.Florida Statutes, section 627.7011 (2026), Florida Legislature. Read Oct 4, 2026.
  22. 22.2023 Florida Building Code, Building, 8th ed., Chapter 1 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  23. 23.2023 Florida Building Code, Building, 8th ed., Chapter 15 (UpCodes viewer, unofficial transcription), UpCodes (Florida Building Code transcription). Read Oct 5, 2026.
  24. 24.Miami-Dade County RER notice, Miami. Read Oct 5, 2026.
  25. 25.Wikipedia articles for each place (secondary), Wikipedia. Read Oct 5, 2026.
  26. 26.NOAA NCEI U.S. Climate Normals 1991-2020, station USW00012842 TAMPA INTL AP, NOAA National Centers for Environmental Information. Read Oct 5, 2026.
  27. 27.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Eta, NOAA National Hurricane Center. Read Oct 5, 2026.
  28. 28.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Hermine, NOAA National Hurricane Center. Read Oct 5, 2026.
  29. 29.NWS Melbourne, Lightning Facts and Trivia, National Weather Service. Read Oct 5, 2026.
  30. 30.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma, NOAA National Hurricane Center. Read Oct 5, 2026.
  31. 31.NOAA Atlas 14 at Keystone: 9.86 in/hr (5-minute, 10-year). NOAA Atlas 14 Precipitation Frequency Data Server. Read Oct 5, 2026.

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Gutters in Keystone

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