Bathrooms and Laundry’s are the wettest rooms in the house which if not waterproofed correctly will cause structural damage. Statistics indicate the average age of a bathroom is around 10 years before being renovated. One of the most commonly changed rooms in the house. Fortunately the Australian Standards AS 3740 apply to waterproof these areas. Both application and membrane products should comply with Australian Standards. The following information is designed for practical advice in two situations:

New Construction bathroom waterproofing membrane  bathroom waterproofing membrane Shower Repairs


Work from the substrate up, determine the condition of the slab or sheeting over timber structure as to the presence of water trapped. If in doubt apply a vapour barrier coating. When planning the job anticipate that building movement will occur and therefore to secure all wall/floor joints, drains, hobs, sheet joints and movement joints. We recommend liquid applied membrane systems for the Australian climate as the most practical and economic products for a secure job.

Apply any standard tile adhesive over our membranes for a decorative look. Wall can be coloured with Classic Paints Low Sheen.

Key Products:

YouTube video – Bond Breaker System – Class II Membranes


For both hob or step-down showers if leaking is a major problem, treat the project ‘as new construction’, pull out the existing shower and start again. However, for minor repairs, pull out any silicon and replace joint sealing with polyurethane. Limit the water penetration by applying a water repellent over the tile grout lines and tiles. Ensure the exit drain is waterproofed. In more extreme cases cover tiles and use a trafficable polyurethane floor.

Key Products:

Reference information:

Diagrams care of MBA NSW and other sources (jpeg diagrams)
Youtube video – Bond Breaker System- Class II Membranes


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