Crawl Space Structural Repair

What the work involves in Wilmington and the Cape Fear region, what it costs, and the situations where it is the wrong thing to buy.

Last updated: 2 August 2026

910 Crawl Space Pros provides crawl space structural repair across Wilmington and the Cape Fear region. Crawl space structural repair is the replacement or reinforcement of framing that has lost capacity — joists, girders, sill plates and piers — usually because sustained moisture allowed decay to take hold.

What we do on the first visit

Probe suspect framing to establish whether the wood is surface-affected or genuinely decayed, take moisture content readings, and identify what is carrying load and what has stopped.

Surface growth versus decay — the probe test

Surface fungal growth sits on wood. Decay fungi digest it. The distinction is not cosmetic and it is easy to establish: a probe pushed into sound framing meets firm resistance, and into decayed framing it sinks.

Where a probe sinks, remediation is no longer the answer on its own — the member has lost section and needs sistering or replacing. This is the finding that changes a $3,000 job into a $9,000 one, and it is why we probe rather than assess visually.

Sistering, replacement and jacks

A joist with localised decay can often be sistered — a new member fastened alongside the old across sound bearing at both ends. That is cheaper and less disruptive than replacement, and structurally sound where the original still carries some load.

Girders and sill plates are more often replaced outright, because they carry more and their failure is less localised. Adjustable steel jacks on proper footings take the load during the work and, where a permanent support point is needed, stay.

The footing is the part that gets skipped

A steel jack set on the crawl space soil, or on a couple of patio pavers, will settle. It has to bear on a poured footing sized for the load it carries. This is the single most common defect we find in prior structural work under Wilmington homes — the jack is fine, what it stands on is not.

What's included

Probe survey of suspect framing with moisture content readings
Clear identification of what is decayed versus surface-affected
Sistering where the original member retains capacity
Full replacement of girders and sill plates where required
Adjustable steel jacks on poured footings sized to the load
Correction of the moisture source that caused the decay
Photographs before, during and after
Written description of what was replaced and why

	DIY	Cheapest quote	Done properly
Liner	6 mil builder sheet, laid loose	6–8 mil, taped seams, not fastened to walls	Reinforced 12–20 mil to ASTM E1745, sealed to piers and walls
Groundwater	Not addressed	Sealed over — water ends up under the plastic	Drainage and sump first, liner second
Humidity control	None, or a household dehumidifier on an extension cord	Undersized unit, condensate draining to the soil	Unit sized to cubic footage, pumped to a proper discharge
Vents	Left open, or foam blocks pushed in	Covered, not sealed	Sealed and detailed so the space is genuinely closed
Wood already affected	Bleach from a spray bottle	Surface treated, moisture source left in place	Growth removed, framing treated, dried, then sealed
What it costs	$300 – $900 in materials	$1,500 – $3,000	$4,200 – $14,000
How long it holds	A season or two	Often fails within a few years	Liner life measured in decades when water is handled first

How structural repair work runs

01
Assess and measure

Humidity, moisture content in the framing, standing water, clearance and access — photographed throughout.
02
Written scope

Line by line, in the order the work has to happen, with a price against each component.
03
The work

Water handled first where present, then the fix itself, then verification.
04
Verify and hand over

Post-work readings recorded and left with you, along with the photographs.