Gutters · West Perrine
Gutters in West Perrine, FL
In West Perrine, a 5-minute downpour in a 10-year storm falls at 10.7 inches an hour. That rate is the figure to size gutters against, not the average rainfall. Gutters and downspouts that handle a normal shower can still overflow in the first minutes of a heavy storm, and that is where most gutter trouble here starts.
Updated October 2026
Rainfall design
How much rain West Perrine gutters must handle
Local design rainfall is the starting point for gutter size. At this location the 1-hour rain in a 10-year storm falls at 3.36 inches an hour, and the 24-hour total in a 10-year storm is 8.03 inches. The 100-year 24-hour total is 14.2 inches. Those figures describe how much water a roof can send at once, which matters more than the yearly total.
IllustrationIllustration: downspout splash block
Rainfall at Miami International Airport averages 67.41 inches a year, and it rains on about 89.6 days a year with at least a tenth of an inch. Much of that falls in the wet season. From May through October the airport gets about 76.6 percent of its normal annual rain. That concentration is why the short, intense burst governs gutter sizing more than the annual total does.
Sizing and code
Sizing gutters and downspouts for West Perrine roofs
Florida's plumbing code sizes horizontal gutters from the flow off the roof, and the design basis changes the answer a lot. A 6-inch half-round gutter at 1/8 inch per foot slope handles 110 gallons a minute under the code table. Going from a 5-inch to a 6-inch half-round adds about 49 percent more capacity at the same slope, by our arithmetic from the table values.
Under the 5-minute, 10-year burst rate used in traditional sizing, a 6-inch half-round at 1/8 inch per foot serves only about 1,107 square feet of roof plan area. On the plumbing code's 100-year, 1-hour basis the same gutter serves about 2,671 square feet. That gap is more than two times, so ask your installer which design basis was used on your quote.
- Check roof plan area and pitch before choosing gutter width.
- Use 6-inch half-round or larger where a long roof slope drains to one run.
- Count half the area of any wall above the roof that sheds rain onto it.
Code and drainage
Downspout discharge and where the water goes
Florida Building Code requires gutters with downspouts on most buildings with eaves under 6 inches, and it requires gutters and leaders to be metal or approved plastic with secure, corrosion-resistant fastening. A downspout that dumps water at the wall can saturate the ground at the foundation, so check where each one lands on your lot before a storm does it for you.
Hidden hangers spaced 24 inches on center are a common standard, but the maker recommends 16-inch spacing and aluminum clips for coastal, storm-prone areas. Ask your installer which spacing is used and why.
Rain on your roof
Preset: 8.03 inches, the 10-year 24-hour rain (NOAA Atlas 14 at West Perrine).
10,005 gallons run off that roof, all of it toward the gutters and downspouts.
Math: square feet × inches × 0.623 gallons.
Questions
Gutters in West Perrine: questions
How hard does it rain in West Perrine?
Short bursts set the gutter load here. A 5-minute downpour in a 10-year storm falls at 10.7 inches an hour, and a 1-hour rain in that storm falls at 3.36 inches an hour. The 24-hour total is 8.03 inches. Miami International Airport averages 67.41 inches of rain a year, with about 76.6 percent of it falling May through October.
Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the West Perrine 2020 Census internal point (25.6061, -80.3639), read Oct 5, 2026
How big should my gutters be in West Perrine?
Size them from roof area and pitch, not from a rule of thumb. Under the plumbing code, a 6-inch half-round gutter at 1/8 inch per foot slope handles 110 gallons a minute, about 49 percent more than a 5-inch. A 6-inch gutter serves about 1,107 square feet on the short-burst basis and about 2,671 square feet on the 100-year, 1-hour basis, by our arithmetic. Confirm the design basis with your installer.
Source: 2023 Florida Building Code, Plumbing, 8th ed., Chapter 11 (UpCodes viewer, unofficial transcription), read Oct 5, 2026
Where should downspouts drain in Miami-Dade?
Miami-Dade downspouts must discharge at least 1 foot from the building's sidewall, according to the residential code. Route them underground, through a tail extension, or onto a splash block. This keeps water from soaking the soil at the foundation. Confirm local requirements with the Miami-Dade County Regulatory and Economic Resources building office before you change your drainage.
Source: 2023 Florida Building Code, Residential, 8th ed., Chapter 8 (UpCodes viewer, unofficial transcription), read Oct 5, 2026
How often should West Perrine gutters be cleaned?
Clean gutters at least twice a year, usually in spring and fall, and more often under overhanging trees or during frequent storms. Southern live oaks drop leaves that make a litter problem, and pines shed most needles in September through November. Many homes here were built around 1975, so older gutter systems may need extra attention as they age. A sensible rhythm is after the spring oak drop, before the June through September storm season, and after the autumn pine-needle peak.
Source: thig.com, read Oct 5, 2026
Sources for this page(30)
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- 2.NOAA NCEI U.S. Climate Normals 1991-2020 (access data service). Read Oct 5, 2026.
- 3.Permit office: Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits. Miami-Dade County Regulatory and Economic Resources (RER) - Building & Permits. Read Oct 10, 2026.
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- 8.2023 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").
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- 14.2023 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").
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South Fork Roofing
Gutters in West Perrine
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