June 23, 2026
Gutter and Drainage Fixes for Heavy Coastal Rain
Wilmington gets roughly 60 inches of rain a year, much of it in violent summer bursts. Here's how to tell whether your gutters and site drainage can handle it — and the fixes that actually work.
Summer on this coast is thunderstorm season, and our storms don't drizzle. Wilmington picks up roughly 60 inches of rain in a typical year — well above the national norm — and a fat share of it arrives in July and August downpours that drop an inch or two in an hour. That's the load your gutters and site drainage were supposedly designed for. Most weren't. Here's how we evaluate a property's water handling, and the fixes in rising order of cost.
Watch Your House in the Rain
The best drainage diagnostic is free: put on a rain jacket during the next heavy storm and walk the house. You're looking for:
- Gutters overflowing mid-run or at corners — undersized, clogged, or badly pitched
- Water sheeting over the gutter from the roof — the gutter's set too low or the roof's outrunning it
- Downspouts dumping at the foundation with nowhere to go
- Ponding against the house, in the crawl space vents' splash zone, or across walkways
- Erosion channels in mulch and soil — water's telling you its route
Ten minutes in a storm tells you more than any dry-day inspection.
Gutters: Size, Pitch, and Protection
Most homes carry 5-inch gutters with standard downspouts because that's what the builder priced. On big roof planes in a heavy-rain climate, that's marginal. The upgrade path we use on coastal homes: 6-inch gutters with oversized (3x4-inch) downspouts move roughly half again more water and clog far less, and adding downspouts to long runs matters as much as gutter size — every foot of gutter should have a reasonable path to an outlet.
Pitch and fastening matter too. Gutters need consistent fall toward the downspouts, and coastal fascia takes enough moisture that spikes work loose; hidden hangers screwed into sound wood hold better. While anyone's up there, fascia softness is worth probing — chronically overflowing gutters rot the board they hang on, and gutters attached to rot don't stay attached.
On guards: they help where pines and oaks load gutters constantly, but they're not maintenance-free, and cheap guards that shed heavy rain past the gutter make summer downpours worse. We're selective about where we recommend them.
Downspouts Are Half the System
A gutter system that collects water perfectly and releases it against your foundation has accomplished nothing. Every downspout needs a discharge plan: splash blocks are the bare minimum, rigid extensions carrying water 4–6 feet out are better, and buried drain lines running to daylight or a pop-up emitter are the clean long-term answer. This is the highest-value drainage money on most properties — and the most commonly skipped.
When the Yard Is the Problem
If water stands against the house even with good gutters, the site needs work:
- Regrading so soil falls away from the foundation — the fundamental fix, and sometimes just a day of shovel-and-topsoil work along one wall
- French drains (gravel trench, perforated pipe, fabric) to intercept water moving toward the house or sitting in low spots
- Channel drains across driveways and walkways that currently deliver sheet flow to the garage
- Dry creek beds and swales to give big water an intentional route — often the right answer on the sandy, flat lots common around here
Sandy coastal soil drains fast vertically but our water table runs high and lots run flat, so "it'll soak in" fails exactly when it matters — in the fourth inch of an August storm.
Why This Is Worth Real Attention Here
Water against a coastal foundation doesn't just make mud. It feeds crawl space humidity and mold, rots band joists, undermines slabs and stoops, and takes out fence posts and gate footings. Nearly every crawl space moisture problem we're called to fix starts outside, at a gutter or a grade.
We handle the whole chain — gutter upsizing, fascia repair, downspout extensions, and drainage work — across the Wilmington area. If your property fails the rainstorm walk-test, tell us what you saw at /estimate and we'll put a fix in a free written estimate.
Common questions
Are 6-inch gutters worth it over standard 5-inch?
In this climate, usually yes on any large or complex roof. Six-inch gutters with 3x4 downspouts carry roughly half again more water and clog less, which matters when summer storms drop an inch-plus per hour. On small, simple roofs, well-maintained 5-inch gutters with enough downspouts can be adequate.
Where should downspouts discharge?
At least 4 to 6 feet from the foundation, and farther is better. Splash blocks alone are the bare minimum; rigid extensions or buried drain lines to daylight or a pop-up emitter are the reliable answers. A downspout dumping at the foundation is the single most common drainage defect we find.
How do I know if my yard needs a French drain?
Walk the property during a heavy storm. If water stands against the house or crosses toward it even though gutters are working, and regrading alone can't redirect it, a French drain or swale intercepting that flow is the standard fix. Standing water that appears repeatedly in the same spot is the clearest indicator.
