Mold Remediation in Highland Park

The stretch of Highland Park along the Raritan River has always had a complicated relationship with moisture. Since Tropical Storm Ida pushed the river over its banks in 2021 — inundating Donaldson Park and the low-lying sections of River Road — many borough homeowners discovered that the real damage wasn’t the flood itself but what grew quietly in the weeks that followed. Mold can colonize wet framing and insulation within 24 to 48 hours, and in the dense pre-war housing stock that defines so much of Highland Park’s residential fabric, it rarely stays visible or contained for long.

Why Highland Park Properties See Mold Problems

Highland Park’s building stock is one of the most telling factors. The borough’s 1910s through 1940s colonials, bungalows, and two-family homes — the kind you find throughout Livingston Manor and the Triangle neighborhood — were built with balloon-frame construction and plaster-and-lath walls. That framing style creates uninterrupted vertical cavities from the basement sill plate to the roof line, meaning a slow leak from aging galvanized supply pipes or a failing cast-iron drain can wick moisture upward through wall cavities long before a stain appears on the ceiling. By the time a homeowner notices discoloration or a musty odor in a finished basement, mold growth may already be well established inside the wall assembly.

The Raritan River’s proximity compounds the problem. Highland Park sits at or below the 20-foot elevation contour along its southern edge, and the water table in low-lying sections near the river fluctuates significantly after heavy rain. Basement slab moisture intrusion is common even in homes that have never experienced a visible flood, and that chronic dampness — combined with the limited ventilation typical of pre-1950 basements — creates ideal conditions for mold year-round, not just after storm events.

Commercial properties along the Raritan Avenue business district face a different pattern. Restaurants and retail spaces with older sprinkler systems or commercial kitchen plumbing see water losses that saturate concrete subfloors and wall cavities, and the multi-unit rentals near Rutgers University (just across the Landing Lane Bridge) generate their own share of delayed-response water events where mold is already active before a call is placed.

Our Mold Remediation Process in Highland Park

Every project starts with a thorough inspection — not just the visible surface but the materials behind it. In Highland Park’s older homes, that means probing plaster walls with a calibrated moisture meter, checking basement rim joists and sill plates, and using a thermal imaging camera to locate moisture trapped inside wall cavities that look dry on the surface.

Once we’ve mapped the affected area, we establish negative-air containment using 6-mil poly barriers and HEPA-filtered air scrubbers. This step is especially important in open balloon-frame homes where spores can travel through wall cavities to unaffected rooms. We then remove compromised materials — whether that’s plaster, drywall, wood framing, or insulation — following IICRC S520 standard protocols. Affected structural surfaces are treated with an EPA-registered antimicrobial agent, and we run commercial-grade drying equipment until moisture readings return to baseline for the material type.

Before we demobilize, we conduct a post-remediation verification, which includes visual inspection and, when warranted, air sampling to confirm spore counts have returned to normal ambient levels. We can coordinate independent clearance testing with a third-party industrial hygienist if your insurance carrier or a prospective buyer’s inspector requires it.

Reaching Highland Park from Kenilworth

The Restoration Group’s Kenilworth office puts Highland Park well within our service radius. Our crews travel Route 28 east to the Garden State Parkway and approach the borough via the New Brunswick corridor, or come directly through Metuchen and Edison depending on traffic. Because Highland Park is a compact borough — roughly one square mile — once we’re across the Raritan we can reach addresses in North Highland Park, the Meadow neighborhood, or Downtown Highland Park within minutes of each other. We operate 24/7, so a call at 2 a.m. after a pipe failure in a Livingston Manor two-family gets the same response as a weekday morning call.

Local Note

One thing that catches homeowners off guard in Highland Park’s older two-families is the shared wall between units. Because balloon-frame construction doesn’t include fire blocking at the floor lines, a mold problem that originates in a first-floor unit’s bathroom can migrate vertically into the second-floor unit’s wall cavity without either tenant being aware. When we work in multi-unit homes in the 08904 ZIP code, we always inspect both units — and both sides of any shared wall — before scoping the remediation. Skipping that step is how a job that looks like a single-bathroom project turns into a call-back three months later.

If you’re dealing with visible mold growth, a persistent musty smell, or recently discovered water damage in your Highland Park home or commercial space, call The Restoration Group at (855) 650-7422. We’ll assess the full scope of the problem, explain what remediation involves for your specific building type, and work directly with your insurance carrier to document and process the claim.