Gutters · Manalapan

Gutters in Manalapan, FL

Rain here can fall at 11.3 inches an hour for five minutes in a 10-year storm. A gutter sized for a gentle rain can overflow in the first few minutes of a summer downpour, and the water then runs down the fascia and onto the ground at the foundation. The sizing, discharge and debris points below all start from that rate.

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Updated October 2026

Ornate iron gates and stone pillars at the entrance to a large estate, with a house behind. — Photo: Manalapan FL Eastover02 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: Manalapan FL Eastover02 by Ebyabe, CC BY-SA 3.0, cropped

Sizing for local rain

Sizing gutters for Manalapan's heaviest short burst

Gutter sizing starts with the heaviest short burst, not the yearly total. Here that burst is the 5-minute, 10-year rate of 11.3 inches an hour, and the 1-hour, 10-year rate is 3.56 inches an hour. The plumbing code sizes horizontal gutters from the roof flow rate, and the table capacities are in gallons per minute, so a contractor converts the rain rate and the roof area before picking a size.

Heavy Florida afternoon downpour pouring off a roof edge with no gutter, splashing mud onto the wall and washing out the flower bed along the foundation (illustration)

Illustration: downpour no gutter

The yearly total is large too: West Palm Beach Intl Airport averages 61.75 inches, and 67.3% of it falls May through October. By our arithmetic, a 6-inch half-round gutter at 1/8 inch per foot carries 110 gallons per minute, about 49 percent more than a 5-inch at the same slope (74 gallons per minute). That difference decides whether a long roof run spills over the front edge in a summer burst.

Check the roof plan area served by each run, adding half the area of any wall that sheds rain onto the roof.
Match downspouts to the gutter run they drain, since a 2 by 2 inch leader carries only 30 gallons per minute.
Ask the installer which rain basis the sizing used, because the design basis can change the answer by more than twofold.

Florida discharge rule

Where downspouts must drain on a Manalapan lot

Florida's residential code calls for downspouts on most homes with short eaves, with exceptions for gable end rakes and roofs above another roof. On a Manalapan lot, the discharge point is what matters most, so the downspout must send water well clear of the wall.

Manalapan lots are small, and water that lands near a sidewall or foundation has nowhere to go but back toward the house. Many homes here are over 40 years old, since the median build year is 1979, so an older downspout that dumps at the wall is common. Owner-occupied homes make up 95.2 percent of occupied units, so the owner usually decides the fix.

Debris and cleaning

Leaves, pollen and trees near Manalapan gutters

Southern live oaks, which can grow 60 to 80 feet tall, drop leaves and fruit that clog gutters, and the spring oak drop and pollen run from January to June, peaking in March and April. Many older homes here sit under mature trees, so a clogged gutter can build up fast.

A sensible cleaning rhythm is after the spring oak and pollen drop, before the June to September storm months, and after the autumn pine-needle peak. Insurer guidance recommends cleaning at least twice a year and more often under overhanging trees or during frequent storms.

Clogged gutters can hold water against the fascia and shingle edges, which may lead to water damage, mold and pests. Confirm the cleaning schedule and any fascia repair with the Town of Manalapan Building and Zoning office before scheduling work.

Rain on your roof

Roof area (square feet)Rain (inches)

Preset: 9.14 inches, the 10-year 24-hour rain (NOAA Atlas 14 at Manalapan).

11,388 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 Manalapan: questions

How big should gutters be for Manalapan rain?

Size them for the 5-minute, 10-year rate of 11.3 inches an hour, which NOAA Atlas 14 gives for this town. A 6-inch half-round gutter at 1/8 inch per foot carries 110 gallons per minute under the plumbing code table, about 49 percent more than a 5-inch gutter at the same slope. Ask any installer which rain basis their sizing uses before you agree to a size.

Source: NOAA Atlas 14 Volume 9 version 2, partial-duration intensity estimates at the Manalapan 2020 Census internal point (26.5666, -80.0402), read Oct 5, 2026

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Where must downspouts drain in Manalapan?

Florida's residential code sets the discharge rule, and downspouts on homes in this town must send water at least 1 foot from the building's sidewall. Because many Manalapan homes were built around 1979, an older downspout that drains at the wall is common and worth checking.

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

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How often should I clean gutters under trees in Manalapan?

Insurer guidance recommends cleaning gutters at least twice a year, usually in spring and fall, and more often under overhanging trees. In Manalapan, live oaks drop leaves and fruit most in the January to June pollen season. Because 67.3% of the yearly rain at West Palm Beach Intl Airport falls May through October, a spring cleaning before that wet stretch is a practical step.

Source: thig.com, read Oct 5, 2026

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Do I need a permit to replace gutters in Manalapan?

Confirm this with the Town of Manalapan Building and Zoning office, which lists its building and zoning information on its official page. Florida rules place gutters within a licensed specialty scope, and local practice can differ, so ask the office directly before work starts.

Source: Town of Manalapan - Building & Zoning, read Oct 5, 2026

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