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Common moisture and mold conditions found in an unencapsulated crawl space

Crawl Space Encapsulation in New Brunswick, NJ

Crawl space encapsulation installs a reinforced 20-mil polyethylene vapour barrier over the floor and lower walls, sealed at all seams and foundation penetrations, to permanently control ground moisture and prevent future mold growth — the definitive solution for chronically damp crawl spaces.

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Crawl space encapsulation in New Brunswick: what to know

New Brunswick's historic downtown includes 19th-century commercial and residential structures where roof maintenance and building envelope integrity are ongoing challenges — interior mold from deferred maintenance is common.

The Raritan River borders the city and has caused historic flooding — low-lying properties near the riverfront have documented flood and mold risk.

Mold conditions in New Brunswick

Common mold types in this area: Cladosporium (historic masonry buildings); Chaetomium (water-damaged drywall in older residential stock); Stachybotrys (chronic basement moisture in riverfront properties).

We serve Rutgers University, Robert Wood Johnson University Hospital, State Theatre New Jersey, Raritan River waterfront and the wider New Brunswick area across ZIP codes 08901, 08902, 08903.

Signs you need crawl space encapsulation

  • Mold has been remediated in the crawl space and a permanent moisture solution is needed
  • Humidity in the crawl space consistently above 60% RH
  • Standing water or saturated soil after rain events
  • Visible condensation on crawl-space framing in summer
  • Musty odour rising from the floor above the crawl space
  • Previous crawl-space mold that has recurred after treatment

How we handle crawl space encapsulation in New Brunswick

Crawl space encapsulation converts an open, vented crawl space into a controlled, sealed environment. A heavy-duty reinforced polyethylene vapour barrier (typically 20-mil with woven reinforcement) is installed over the entire crawl-space floor and extends up the foundation walls, creating a continuous vapour barrier that prevents ground moisture from entering the space above.

Encapsulation is typically recommended after crawl-space mold remediation as the permanent moisture control measure, and sometimes as a standalone upgrade for crawl spaces with elevated humidity but no current mold. When combined with a dehumidifier or HVAC supply, the encapsulated crawl space maintains low relative humidity year-round, eliminating the conditions that support mold growth on structural framing.

Simple, transparent process

Our New Brunswick Crawl Space Encapsulation Process

  1. 1

    Pre-encapsulation assessment

    The crawl space is assessed for standing water, drainage issues, existing mold, and structural concerns. Any mold remediation must be completed and cleared before encapsulation. Active water infiltration must be addressed with drainage or waterproofing before the barrier is installed.

  2. 2

    Surface preparation

    Existing debris, old vapour barriers, and damaged insulation are removed. The soil surface is graded to promote drainage toward the sump crock if present. Foundation walls are cleaned and checked for cracks.

  3. 3

    Vapour barrier installation

    A 20-mil reinforced polyethylene barrier is cut to fit the crawl-space floor and overlapped at all seams by at least 12 inches, with seams sealed with butyl tape. The barrier is extended 6–12 inches up the foundation walls and secured with mechanical fasteners and sealant.

  4. 4

    Foundation wall coverage

    The vapour barrier is attached to the foundation wall to the rim joist level and sealed at all penetrations (pipes, wiring, columns). This prevents warm exterior air and ground moisture from entering at the perimeter.

  5. 5

    Dehumidifier installation

    A commercial-grade dehumidifier with automatic drainage is installed in the encapsulated crawl space to maintain RH below 55%. The dehumidifier is sized for the volume of the crawl space and the local climate moisture load.

Crawl Space Encapsulation in New Brunswick — FAQs

Do you provide crawl space encapsulation in New Brunswick?

Yes — MoldAct provides crawl space encapsulation throughout New Brunswick, NJ (ZIP codes: 08901, 08902, 08903) and surrounding New Jersey areas. Call us to book the earliest available appointment.

How long does crawl space encapsulation last?

A properly installed 20-mil reinforced vapour barrier lasts 20–25 years with minimal maintenance. Dehumidifiers typically require filter cleaning every 1–3 months and compressor service every 5–7 years.

Does encapsulation replace my sump pump?

No — if the crawl space has groundwater intrusion, a sump system is required to manage active water before encapsulation. Encapsulation controls vapour moisture; it does not manage liquid water infiltration.

What is the difference between a vapour barrier and encapsulation?

A vapour barrier is a thin poly sheet (typically 6-mil) placed on the crawl-space floor. Encapsulation is a full system: heavier barrier (20-mil), wall coverage to rim joist, sealed seams, and mechanical dehumidification — a sealed, conditioned environment rather than a barrier alone.

Crawl Space Encapsulation in New Brunswick — book today

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