Gutters · Longboat Key

Gutters in Longboat Key, FL

On Longboat Key, a 5-minute downpour in a 10-year storm falls at 10.2 inches an hour, and a 100-year burst reaches 13.7. Gutters sized for lighter rain will overflow in the first minutes of a summer storm. Sizing gutters here starts with that number, not a general rule of thumb.

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Updated October 2026

Two-storey white historic house with a green-trimmed entrance, palm trees, and a green lawn in daylight. — Photo: Longboat Key FL Jordan House01 by Ebyabe, CC BY-SA 3.0, cropped

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. — Photo: Longboat Key FL Jordan House01 by Ebyabe, CC BY-SA 3.0, cropped

Sizing for local rain

How big gutters and downspouts should be on Longboat Key

The plumbing code sizes horizontal gutters from the flow off the roof, and it lists capacities by size and slope. Gutters of this profile, six inches across as a half-round with a 1/8 inch per foot slope, handle 110 gallons per minute. A 5-inch one carries 74. That is about 49 percent more water for one size step, so the step matters on a wide roof.

White rectangular downspout running from the gutter down a sand-colored stucco wall, turning through an elbow into an extension that rests on a concrete splash block on the lawn, carrying water away from the foundation (illustration)

Illustration: downspout splash block

Downspouts need the same care. The code lists a 3 by 4 1/4 inch or 4-inch round leader at 192 gallons per minute, and a 2 by 2 inch leader at only 30. Before settling on a leader size, count half of every wall's area that drains rain onto the roof. A wall that drains onto a roof section adds to that roof's load even though it is not roof.

Local rainfall is heavier than many older tables assume. One older table reproduced by a gutter maker was based on records through 1978, and it gives lower intensities for Florida cities than current NOAA values. Confirm the design basis with the Town building office before you size a job from any table.

Downspout discharge rules

Where the water has to go on your lot

Under Florida code, each downspout has to empty no less than 1 foot out from the wall, whether through buried pipe, a tail extension, or a splash block. On a Longboat Key lot, that foot keeps the 10.2-inch-an-hour burst from soaking the footing and the fill against the house.

Buildings with eaves under 6 inches must have gutters and downspouts. Only 19.3 percent of homes here are single-family detached, and the rest are attached or multi-unit buildings, so check each eave line when you plan the run.

Debris and upkeep

Leaves, needles and cleaning on Longboat Key

Southern live oaks on a Longboat Key lot shed leaves and fruit that become a litter problem in gutters. Pine needles peak from September through November, and the needles stay on the ground for about two years before they fall.

Spring is the other heavy shedding season. Florida pollen runs from January to June and peaks in March and April, and oaks are among the major sources. A sensible cleaning rhythm is after the spring oak drop, before the June through September storm season, and after the autumn needle peak. Trees with heavy canopy call for more frequent checks.

Fine-mesh guards did better than screens with larger holes in an independent test, but even the top screen struggled with a severe downpour. Guards still need brushing in high-pollen areas, which means a ladder or a professional.

Rain on your roof

Roof area (square feet)Rain (inches)

Preset: 7.1 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Longboat Key).

8,847 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 Longboat Key: questions

How hard does it rain on Longboat Key?

Here, a 10-year storm lasting five minutes can drop rain at 10.2 inches per hour. A 25-year storm reaches 11.7, and a 100-year storm reaches 13.7. A 1-hour rain in a 10-year storm falls at 3.1 inches an hour. Over 24 hours, a 10-year storm drops 7.1 inches, and a 100-year storm drops 12.4 inches. Gutters need to move that water quickly, so size them for these values rather than for average rain.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Longboat Key 2020 Census internal point (27.4005, -82.6442), read Oct 5, 2026

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Do gutters on Longboat Key need downspouts that drain away from the house?

Yes. The Florida code calls for each downspout to terminate at least a foot clear of the sidewall. The discharge can be an underground pipe, a tail extension or a splash block. Confirm the exact requirement for your lot with the Town of Longboat Key Building Division before you install anything.

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

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How often should gutters be cleaned on Longboat Key?

Experts quoted by a Florida home insurer recommend cleaning gutters at least twice a year, usually in spring and fall. Clean more often under overhanging trees or after frequent storms. On a lot with live oaks, add a check after the spring pollen peak, before June, and after the autumn pine needle drop. Many of the homes on the key date from 1980, so older gutters may have sagging sections that trap debris and should be inspected at each cleaning.

Source: thig.com, read Oct 5, 2026

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Who issues permits for gutter work on Longboat Key?

The Town of Longboat Key Building Division, part of Planning, Zoning and Building, handles building permits here. Ask the Division whether your gutter or fascia work needs a permit before you start, because repairs in a town hit by recent storms may be subject to Town review.

Source: Town of Longboat Key - Building Division (Planning, Zoning & Building), read Oct 5, 2026

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