Tanking Slurry COSHH Assessment Form

A pre-filled COSHH Assessment Form for Tanking Slurry, with some example text reading:

Health risks: Irritating to the respiratory system and skin may cause chemical burns. Risk of severe damage to eyes. It may cause sensitisation by skin contact.

Skin contact: If the product comes into contact with the skin, it may cause chemical burns, and the product may sensitise the skin.

Eye contact: There may be irritation, redness, and chemical burns. The eyes may water profusely.

Ingestion: May cause irritation, nausea, vomiting and diarrhoea.

Inhalation: Respirable crystalline silica dust may cause irritation to the respiratory system. Prolonged and/or massive inhalation may cause lung fibrosis, commonly referred to as silicosis. The principal symptoms of silicosis are cough and breathlessness. Occupational exposure to respirable crystalline silica dust should be monitored and controlled.

Tanking slurry, or cementitious tanking, is a thick liquid coating used for waterproofing basements, cellars, and structures prone to water ingress. It consists of Portland cement, selected aggregates, and chemical modifiers, sometimes with acrylic polymers for added strength and flexibility.

The slurry is mixed with water to the desired consistency and applied in multiple coats to surfaces such as brick, concrete, stone, and cement. Each layer must reach a certain thickness to ensure effective waterproofing.

As it cures, the slurry forms crystals that block pores and capillaries in the masonry, creating a watertight barrier that prevents moisture penetration, dampness, mould, and structural damage.

Commonly used in below-ground basements, cellars, retaining walls, swimming pools, and other areas with standing water, tanking slurry enhances the durability and safety of structures in wet conditions, making it vital for modern construction and renovation.

This document is:

• Recognised by local authorities
• Recognised by principal contractors
• Suitable for CDM sites
• Approved by H&S managers

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