Mould Remediation

Mould growth requires persistent moisture. Commercial causes include roof leaks, failed wall joints, plumbing releases, wet insulation, foundation seepage, blocked drains, cold-surface condensation, uncontrolled humidity, and incomplete drying after a flood. Harrowgate locates the water path and affected assembly so remediation corrects the cause rather than only cleaning visible growth.

No. Porous materials that cannot be fully cleaned, such as contaminated gypsum board, ceiling tile, and insulation, are normally removed. Sound structural wood, concrete, metal, and other durable surfaces can often be retained after mechanical cleaning, HEPA vacuuming, damp wiping, and drying. The project protocol and substrate condition determine the decision.

We isolate the work with sealed barriers, protect HVAC openings, maintain inward airflow with HEPA-filtered negative-air units, and establish controlled entry and waste routes. Materials are cut carefully and bagged inside containment. HEPA-equipped tools, progressive cleaning, pressure checks, and final high-to-low cleaning keep contaminated dust inside the defined work zone.

Not always. Visible growth and water-damaged materials can often be scoped through inspection, moisture mapping, and selective openings. An occupational hygienist may specify air or surface sampling for complex, disputed, sensitive, or clearance-driven projects. Harrowgate follows the project protocol and keeps physical source removal, drying, and visual cleanliness as the core controls.

Acceptance depends on the material and a dry reference from an unaffected part of the same building. We record moisture readings over time and verify that the source repair is effective. Cavities are not closed while readings remain elevated, insulation is wet, or condensation conditions persist. Stable dry readings support the close-in decision.

Yes, when the contamination, access, and mechanical systems permit safe phasing. We use sealed work zones, negative air, protected access routes, scheduled noisy work, and defined handback points. The facility team coordinates occupant movement and HVAC operation while Harrowgate controls demolition, waste movement, cleaning, drying, and reconstruction within each phase.

Closeout should document the repaired moisture source, removed materials, cleaning method, drying readings, visual acceptance, consultant verification where specified, and reconstructed assemblies. Harrowgate also records concealed conditions and recommends access or maintenance measures for roofs, drains, sealants, plumbing, and humidity controls that could affect future building performance.