# Crawl Space Structural Repair in Wilmington, NC > Sistered joists, replaced girders and adjustable steel jacks on proper footings, where moisture has. What it costs, and when it is the wrong answer. URL: https://910crawlspacepros.com/services/crawl-space-structural-repair/ Home / Services / # Crawl Space Structural Repair 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 ASTM E1745 reinforced liner • IRC R408.3 closed crawl space • Class I vapor retarder (<0.1 perm) • ICC-ES certified flood vents • Written scope before work starts 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 ## Related reading Crawl Space Repair Cost in Wilmington, NC Price my structural repair Free quotes within 24 hours. Free on-site assessment first. Website What do you need? Select a service… Crawl Space Encapsulation Crawl Space Insulation Crawl Space Waterproofing Crawl Space Mold Removal Crawl Space Vapor Barrier Installation Crawl Space Dehumidifier Installation Crawl Space Drainage Crawl Space Sump Pump Installation Crawl Space French Drain Crawl Space Cleanup Crawl Space Structural Repair Sagging Floor Repair Crawl Space Door Replacement Flood Vent Installation Not sure — I need someone to look ZIP code Continue Your name Phone What are you seeing? (optional) Back Request my inspection Got it — your request is in. We'll be in touch with a quote. Standards we work to ASTM E1745 — vapor retarder specification Class I vapor retarder, below 0.1 perms IRC R408.3 — unvented crawl space conditioning NC Residential Code crawl space requirements Other services Crawl Space Encapsulation Crawl Space Insulation Crawl Space Waterproofing All services → ## DIY, cheap quote, or done properly Most of the price difference between quotes is not labour — it is which of these steps the quote silently leaves out. 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. , not a heading: this is a CTA, not a section of the document outline. --> Get crawl space structural repair priced for your home Free on-site assessment across Wilmington and New Hanover, Brunswick and Pender counties. Call (910) 886-2018 Get a free quote ## Crawl Space Structural Repair questions How much does crawl space structural repair cost? Highly variable — a single sistered joist may be a few hundred dollars, while a replaced girder line with new footings runs into five figures. The probe survey is what turns a guess into a number. How do I know if my floor framing is actually damaged? Bounce underfoot, sloping floors, and doors that have started binding are the symptoms. The confirmation is a probe: if it sinks into a joist or girder, the wood has lost section. Can you repair framing without fixing the moisture? We will not. New wood in the conditions that destroyed the old wood decays too. The moisture correction is part of the scope, not an upsell. Do I need a permit for structural repair? Structural work generally is permitted work in New Hanover County. We confirm scope with the county before starting rather than after. Related services Crawl Space Encapsulation A sealed liner across the floor, piers and walls, taped and mechanically fastened, with the vents closed and the space dried. It is the full system, not a sheet of plastic laid on dirt. Crawl Space Insulation Wall insulation for a sealed crawl space, or subfloor batts for a vented one. Which is correct depends on whether the space is closed — installing the wrong one traps moisture against wood. Crawl Space Waterproofing Stopping water getting in, before anything gets sealed. Grading, downspout extensions, perimeter drainage and a sump where the water table demands it.