A walk through Forest Hills, Carolina Heights, Sunset Park, or the Wilmington Historic District will show you thousands of homes built between roughly 1880 and 1965 over crawl space foundations. Add in the cottages on Wrightsville Beach and Carolina Beach, plus the older sections of Hampstead and the surviving farmhouses around Castle Hayne, and you’re looking at the dominant foundation type for everything in this region built before the modern slab era.
These crawl spaces are in trouble. Decades of coastal humidity, salt-laden air, repeated hurricane flooding, and sandy soil erosion have done damage that you can’t see from the curb but you can feel under your feet — sloping floors, soft spots, doors that no longer close.
What’s Happening Down There
Original crawl space construction in Wilmington was straightforward and, for its time, sound. Brick piers — usually 16 inches square on shallow concrete or brick footings, sometimes just on packed sand — were laid up to support heavy heart-pine girders. Joists ran across the girders, subfloor on top of joists. For decades it worked.
What’s failed now, on most Wilmington crawl space homes, is some combination of:
Pier deterioration. Lime-mortar brick piers from the early 1900s simply don’t hold up in a coastal humidity environment past about 80 years. The mortar turns powdery, bricks lean, and individual piers settle inches below original elevation.
Sill plate and rim joist rot. Wilmington’s relative humidity sits above 70% for most of the year, and the original sill plates were untreated yellow pine or cypress. Many have softened, rotted through, or hollowed out from termite damage. The eastern subterranean termite is endemic to coastal North Carolina and Wilmington homes are prime territory.
Hurricane flooding. Florence in 2018 put crawl spaces underwater for days throughout New Hanover and Pender counties. Matthew, Isaias, Ian, and the unnamed nor’easters that hit hard between named storms have all left flood lines in Wilmington crawl spaces. Even after the water recedes, the moisture stays in the wood for months.
Sandy soil erosion under footings. Coastal sand washes more easily than the clay soils most building codes were designed around. We routinely see piers in Wilmington crawl spaces sitting on what’s now thin air — the original footing soil has been carried away by groundwater flow.
Chronic moisture and mold. Even without flooding, Wilmington crawl spaces operate at near-100% relative humidity for months at a time. Wood members rot, fasteners corrode, and mold colonies thrive.
How We Repair It
Crawl space work in Wilmington is rarely one job — it’s usually four jobs combined. A typical project includes:
Pier replacement and supplementation. Failed brick piers are removed and replaced with adjustable steel piers on properly poured footings, or with new concrete block piers where the historic appearance matters. We use galvanized hardware throughout because of the coastal environment.
Sill plate, rim joist, and girder repair. Rotted wood members are sistered with pressure-treated lumber or replaced section by section using carefully managed jacking. We work in stages so the floor above never loses support.
Termite damage remediation. We coordinate with your pest control company — or recommend one if you don’t have one — to make sure active termite issues are resolved before we close up the structure. Several of the Wilmington pest control companies are excellent and we have working relationships with them.
Moisture control. This is the critical step in a coastal climate. Vapor barriers, drainage correction, and where appropriate, full encapsulation with sealed perimeter, dehumidification, and conditioned air.
A Note on Encapsulation in a Coastal Climate
Crawl space encapsulation is a high-value upgrade for Wilmington homes — when it’s done right. A properly encapsulated crawl space can drop your home’s overall humidity by 15 to 25 percentage points, eliminate mold concerns, reduce HVAC load, and protect wood members for decades.
But cheap encapsulation in Wilmington is worse than no encapsulation. We’ve torn out plenty of failed jobs where someone rolled out 6-mil plastic, didn’t seal the perimeter, didn’t address drainage, and didn’t dehumidify — leaving moisture trapped against wood and accelerating the rot. A real encapsulation in our climate uses 12 to 20 mil reinforced barrier, sealed perimeter and seams, sealed vents, and conditioned air. Anything less isn’t worth doing.
Service Areas for Crawl Space Work
We do crawl space work throughout:
- Historic District — South Third, Front, Market, Orange Streets and surrounding blocks
- Forest Hills — 1920s and 30s construction
- Carolina Heights and Carolina Place — early 1900s frame homes
- Sunset Park — pre-WWII cottages
- Pine Valley — older sections with crawl spaces
- Wrightsville Beach and Carolina Beach — coastal cottages on piers
- Older Hampstead, Castle Hayne, and rural Pender County — farmhouses
Free Inspection
Call (555) 555-5555 for a free crawl space inspection. We’ll go down there, photograph everything, and give you an honest assessment.