Gutters · Boynton Beach
Gutters in Boynton Beach, FL
A 5-minute downpour in a 10-year storm drops rain on Boynton Beach at 11.1 inches an hour. That rate is higher than the older gutter tables assume. Gutters sized for gentler Florida rain can overflow in the first minutes of a summer storm.
Updated October 2026

Our workRainfall rates
Boynton Beach rainfall rates and gutter capacity
The burst matters more than the yearly total. The rate climbs to 13.1 inches an hour in a 25-year storm and 16.2 in a 100-year storm. A 1-hour rain in a 10-year storm falls at 3.49 inches an hour. Gutters overflow in the short burst, not over the hour.
IllustrationIllustration: downpour no gutter
Florida plumbing code says horizontal gutters must be sized from the flow off the roof surface. Its table lists 110 gallons a minute for a 6-inch half-round gutter and 74 for a 5-inch at the same slope. By that table, the 6-inch carries about 49 percent more.
Downspouts are the other limit. The same code rates a 3-inch round leader at 92 gallons a minute and a 4-inch round at 192. A long roof run feeding one small downspout is a common weak point. Ask whoever quotes the job which design rate they used.
Discharge rules
Where the downspout water goes on your lot
Florida Building Code requires gutters with downspouts where eaves project less than 6 inches. Gable end rakes and roofs above other roofs are exempt. The water must land at least a foot away from the wall, carried by underground piping, tail extensions or splash blocks.
Only 40.9 percent of Boynton Beach housing units are single-family detached, so many roofs sit close to a neighbor, a wall or a shared walkway. Check where a tail extension lands before you accept the layout. Water pushed toward the next unit becomes your problem.
The median home here dates to 1984, close to the Palm Beach County median of 1986. Gutters from that era are likely worn or undersized. That is an inference, so inspect each run. The code also requires metal or approved plastic, with corrosion-resistant fasteners.
Upkeep
Leaves, the wet season and when to clean
At West Palm Beach Intl Airport, 67.3 percent of normal annual rain falls May through October, and August is the wettest month at 8.68 inches. Clean gutters before May. The Atlantic hurricane season starts June 1.
A Florida insurer advises cleaning at least twice a year, more often under overhanging trees. A Central Florida schedule puts one cleaning after oak leaf drop and pollen in late April or May, and another after the autumn pine needle peak. Fine-mesh screens tested better than large-hole ones, but still need brushing.
Storms bring lightning. The National Weather Service tells people not to work on rooftops when thunder can be heard. Clean gutters on a dry, calm day, from a ladder you trust.
Rain on your roof
Preset: 8.69 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Boynton Beach).
10,828 gallons run off that roof, all of it toward the gutters and downspouts.
Math: square feet × inches × 0.623 gallons.
Questions
Gutters in Boynton Beach: questions
How big should gutters be in Boynton Beach?
Larger than the old standard. The 5-minute, 10-year rate here is 11.1 inches an hour. Florida plumbing code rates a 6-inch half-round gutter at 110 gallons a minute and a 5-inch at 74. Roof area, pitch and slope change the answer, so ask the installer to show the numbers used. A 6-inch gutter with 3-inch or 4-inch round downspouts suits many homes, but your roof decides.
Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Boynton Beach 2020 Census internal point (26.5268, -80.0806), read Oct 5, 2026
Does Florida code require gutters on a house?
Only in certain cases. Florida Building Code requires gutters with downspouts where eaves project less than 6 inches, except at gable end rakes or on a roof above another roof. The code sets a minimum of one foot between the downspout outlet and the wall. Confirm the details for your project with the Boynton Beach Building Department.
Source: 2023 Florida Building Code, Residential, 8th ed., R318.5 (UpCodes viewer, unofficial transcription); FBC-Building 1503.7, read Oct 5, 2026
How often should I clean gutters in Palm Beach County?
At least twice a year, typically spring and fall, and more often under trees. Rain is heaviest May through October, with August the wettest month at 8.68 inches at West Palm Beach Intl Airport. Clean before the wet season starts. After storms, look for granules from the shingles collecting in the gutters, which can be a sign of an aging roof.
Source: NOAA NCEI U.S. Climate Normals 1991-2020 (access data service), read Oct 5, 2026
Do I need a permit for gutters in Boynton Beach?
We could not confirm a gutter-only rule. State rules place gutters inside a specialty contractor scope, and local practice varies by county. The city's Building Department is the place to ask. Gutter work done with a roof replacement is usually reviewed with that roof permit.
Source: City of Boynton Beach - Building Department, read Oct 5, 2026
Sources for this page(39)
- 1.Single-family detached share of housing units: 40.9%. U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25024, via Census Reporter API. Read Oct 5, 2026.
- 2.Median year homes were built: 1984. U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, via Census Reporter API. Read Oct 5, 2026.
- 3.U.S. Census Bureau, American Community Survey 2024 5-year estimates (2020-2024), table B25035, via Census Reporter API. Read Oct 5, 2026.
- 4.Hurricane Matthew (2016). NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Matthew (AL142016). Read Oct 5, 2026.
- 5.NOAA NCEI U.S. Climate Normals 1991-2020 (access data service). Read Oct 5, 2026.
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- 8.NWS Miami, Weather Safety - Lightning. Read Oct 5, 2026.
- 9.Permit office: City of Boynton Beach - Building Department. City of Boynton Beach - Building Department. Read Oct 10, 2026.
- 10.2023 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").
- 11.NOAA Atlas 14 (HDSC Precipitation Frequency Data Server). Read Oct 5, 2026.
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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").
- 15.thig.com. Read Oct 5, 2026.
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- 20.Owens Corning, "3 Signs That It's Time to Replace Your Roof". Read Oct 5, 2026.
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- 23.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Matthew (AL142016), NOAA National Hurricane Center. Read Oct 5, 2026.
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- 31.Official website: City of Boynton Beach, Post Storm Permitting, Official website. Read Oct 5, 2026.
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- 36.NOAA National Hurricane Center, Tropical Cyclone Report: Hurricane Irma (AL112017), NOAA National Hurricane Center. Read Oct 5, 2026.
- 37.Florida Statutes, section 489.113 (2026), Florida Legislature. Read Oct 5, 2026.
- 38.Florida Statutes, section 713.135 (2026), Florida Legislature. Read Oct 5, 2026.
- 39.NOAA Atlas 14 at Boynton Beach: 11.1 in/hr (5-minute, 10-year). NOAA Atlas 14 Precipitation Frequency Data Server. Read Oct 5, 2026.
South Fork Roofing
Gutters in Boynton Beach
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