Mould Remediation RAMS: A Practical Guide for Contractors (2026)

Table of Contents

• Why Mould Remediation RAMS Are Complex
• The Legal Framework: COSHH, CDM 2015, and Biocide Regulations
• Key Hazards in Mould Remediation
• Containment and Hygiene Controls
• Biocide Application: COSHH and Method Statement
• What Your Mould Remediation RAMS Must Cover
• Frequently Asked Questions
• Next Steps

Why Mould Remediation RAMS Are Complex

Mould remediation may appear straightforward on the surface — cleaning and treating affected areas to remove fungal growth — but from a health and safety perspective, it is a complex specialist activity. Operatives are potentially exposed to large concentrations of mould spores, which can cause serious respiratory conditions including hypersensitivity pneumonitis. The biocidal products used in treatment are hazardous substances in their own right. And if containment procedures are inadequate, mould spores can be spread to previously unaffected areas.

Under CDM 2015, mould remediation contractors must produce Risk Assessments and Method Statements before work begins. More specifically, the COSHH Regulations 2002 impose detailed duties in respect of both mould spore exposure and biocidal chemical handling. This guide provides a practical framework for producing compliant mould remediation RAMS.

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The Legal Framework: COSHH, CDM 2015, and Biocide Regulations

The key legislation governing mould remediation in the UK includes:

• COSHH Regulations 2002 — Require employers to assess the risk from hazardous substances (including biological agents such as mould) and implement controls to prevent or adequately control exposure. A COSHH assessment must be prepared before mould remediation work begins.
• CDM 2015 — Requires a RAMS for all construction and refurbishment work, including mould remediation on construction sites or as part of a building renovation.
• Biocidal Products Regulation (BPR) 528/2012 — Governs the use of biocidal products in the UK. Products used for mould treatment must be registered under the BPR (or GB equivalent post-Brexit). Only authorised products may be used, and the conditions of authorisation (including application method and PPE requirements) must be followed.
• Control of Pesticides Regulations 1986 (as amended) — May apply to certain mould treatment products classified as pesticides.
• Work at Height Regulations 2005 — Apply where mould remediation involves working at height, which is common in roof spaces, ceiling voids, and stairwells.

Key Hazards in Mould Remediation

Your risk assessment must identify all significant hazards. For mould remediation, these typically include:

• Mould spore inhalation — Disturbing mould growth releases large quantities of spores into the air. Inhalation of mould spores can cause allergic reactions, asthma exacerbation, and in susceptible individuals, hypersensitivity pneumonitis (extrinsic allergic alveolitis). Respiratory protection is required for all personnel in contaminated areas.
• Skin and eye contact with mould — Mould can cause skin irritation and eye infections. Appropriate PPE including gloves and eye protection must be worn.
• Biocidal chemical hazards — Mould treatment biocides may be corrosive, sensitising, or harmful by inhalation. COSHH assessments must be prepared for each product used. RPE requirements depend on the specific product and application method.
• Cross-contamination — If mould spores are not contained during remediation, they can be spread to previously unaffected areas. This can worsen the problem and potentially affect other occupants.
• Structural hazards — Mould growth is often associated with water damage. Affected structural elements may be weakened. Before work begins, a structural assessment may be required.
• Working in confined spaces — Mould remediation in roof voids, crawlspaces, and service risers may constitute confined space entry under the Confined Spaces Regulations 1997.
• Working at height — Treatment of ceiling surfaces and high-level walls involves working at height. Use of stepladders, hop-ups, or MEWPs must be covered in the RAMS.

Containment and Hygiene Controls

Containment is the critical control that prevents mould spore spread during remediation. Your method statement should specify:

• Work area isolation — The affected area must be sealed off from the rest of the building using polythene sheeting and tape. Air supplies should be isolated or sealed. Negative pressure should be maintained within the work area using a High Efficiency Particulate Air (HEPA) filtered negative air pressure unit (NAP).
• Decontamination unit — A decontamination procedure for operatives leaving the work area must be specified. This typically involves removing disposable overalls, wiping down footwear, and passing through a clean zone before removing respiratory protection.
• Waste management — Mould-contaminated materials (plasterboard, timber, insulation) must be double-bagged in heavy-duty polythene before removal from the work area. Waste should be classified and disposed of in accordance with the relevant waste regulations.
• HEPA vacuuming — Surfaces adjacent to affected areas should be HEPA vacuumed to remove spore fallout. Standard vacuum cleaners must not be used as they will spread spores.

Biocide Application: COSHH and Method Statement

The application of biocidal products to mould-affected surfaces requires a detailed method statement and individual COSHH assessments for each product. Your method statement should cover:

• Pre-treatment — Physical removal of loose mould growth by wire brushing, scraping, or wet wiping. This generates the highest mould spore concentrations and requires the highest level of RPE.
• Surface treatment — Application of biocide in accordance with the manufacturer's instructions and the product's BPR/UKBPR authorisation. Specify application method (spray, brush, roller), dilution rate, dwell time, and number of coats.
• Drying and ventilation — Most biocides require adequate ventilation to dry. Specify the ventilation method and drying time before other trades enter the area.
• Second coat and final inspection — Many treatment protocols require multiple applications. The method statement should specify the interval between coats and the inspection criteria before treatment is considered complete.

For each biocide product, a COSHH assessment must be prepared identifying the hazardous constituents, exposure risks, control measures (including RPE specification), and emergency procedures.

What Your Mould Remediation RAMS Must Cover

• Scope of works: extent and location of mould growth, substrate types
• Legal framework: CDM 2015, COSHH, BPR compliance confirmation
• Risk assessment: mould spore inhalation, biocide hazards, structural risks, confined space
• Containment plan: isolation, negative pressure, decontamination procedure
• Method statement: physical removal, biocide application, drying, inspection
• COSHH schedule: biocide products, product safety data sheets, exposure controls
• RPE specification: FFP3 minimum for spore exposure, APF-appropriate RPE for biocide application
• PPE schedule: coveralls, gloves (nitrile minimum), eye protection, safety footwear
• Waste management: classification, double-bagging, disposal route
• Working at height controls if applicable
• Confined space procedure if applicable
• Emergency arrangements: first aid, spill procedure

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Frequently Asked Questions

Q: What RPE is required for mould remediation?
A: For work that will disturb mould growth and generate spore aerosols, a minimum of FFP3 disposable filtering facepiece respirator is required. For biocide application by spray, the RPE class depends on the product's COSHH assessment — some products may require an air-fed respirator or half-face respirator with appropriate filter cartridges. Consult the product safety data sheet and a COSHH competent person.

Q: Do we need a separate COSHH assessment for the biocide?
A: Yes. Your RAMS should reference a separate COSHH assessment for each biocidal product used. The COSHH assessment must be product-specific and cover all routes of exposure (inhalation, skin, ingestion). COSHH assessments must be reviewed when the product changes.

Q: Is mould remediation classed as notifiable under CDM 2015?
A: CDM 2015 notification applies to construction projects that exceed 30 working days with more than 20 simultaneous workers, or 500 person-days. Most standalone mould remediation projects do not meet this threshold. However, if the remediation is part of a larger notifiable project, it falls within the CDM notification.

Next Steps

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