A Florida builder skipped gutters across a subdivision. Do homes on sandy soil need them?
A homeowner in a three-year-old Florida subdivision asked on Reddit's r/Contractor whether the house needs the gutters its builder never installed. Florida code requires them only where eaves project less than 6 inches, but roof water still has to drain away from the slab.
Florida keeps its gutter rule in the termite chapter of its residential code. Section R318.5 of the 2023 Florida Building Code, Residential, requires gutters with downspouts on buildings whose eaves stick out less than 6 inches, with exceptions for gable rakes and a roof that sits above another roof. Wherever downspouts are installed, they have to discharge at least 1 foot from the wall. A house with eaves of 6 inches or more can meet the rule with no gutters.
The stricter rule in the model code is narrow. International Residential Code section R801.3 sends roof water 5 feet or more from foundation walls, but only in areas known for expansive or collapsible soils. An International Code Council interpretation issued in 2003 says that distance applies to foundation walls and not to slab-on-grade foundations.
Grading is required everywhere. Section R401.3 says the ground must drop 6 inches or more over the first 10 feet out from the foundation, and paved surfaces within 10 feet must slope 2% away; where a lot is too tight, drains or swales are required. Without gutters, a roof of 1,000 square feet drops about 623 gallons at the drip line in a 1-inch rain, The Roofing Brief calculates. Louvers such as Rainhandler scatter that water in a band 2 to 3 feet wide, and a gravel drip path stops splash and erosion under the eave. Neither carries water away, so both depend on grade that already drains.
Clearwater installer Guttersmith lists $12 to $18 per foot for 6-inch seamless gutters. Leaf guards add $9 to $15 per foot. Regrading costs $500 to $1,000 for a small area and $1,000 to $5,000 for an average lot, according to HomeGuide figures cited by The Roofing Brief. Owners can measure eave depth, check the 6-inch fall with a string line and a level, and look after a storm for a trench along the drip line or sand washed off the slab edge.
Why it matters: Florida builders can legally leave gutters off when eaves reach 6 inches, so grade is the item to inspect. Before closing or before the warranty runs out, check for a 6-inch drop over 10 feet and downspouts that discharge at least 1 foot out.
Sources
- Do I need gutters?Reddit r/Contractor, Oct 31