DAMPFIX^® 1K

Bostik Dampfix^® 1K high-performance, single-component cementitious waterproofing membrane designed for a wide range of internal and external wet area applications, including below-ground and negative pressure environments. Supplied as a dry powder, it is simply mixed with water on-site to produce a brushable slurry that forms a tough, durable waterproof barrier.

Made in Australia and compliant with AS/NZS 4858, AS 4654.1, and AS 4020:2018, Dampfix^® 1K is suitable for under-tile waterproofing, basements, retaining walls, balconies, and areas exposed to potable water. It resists negative hydrostatic pressure up to 5 bar (50m), making it ideal for structural waterproofing.

KEY FEATURES

Cementitious & Single-Component: Just add water – no primers or additives required
Withstands Negative Pressure: Tested to 5 bar (50m) water head – ideal for basements and below-ground walls
AS 4020:2018 Certified: Safe for potable water contact – suitable for water tanks, troughs, and plant rooms
Made in Australia: Formulated for local conditions and compliance
Internal & External Use: Suitable for wet areas, balconies, planter boxes, and structural waterproofing
Class 1 Membrane (AS 4654.1): Low extensibility membrane for structural protection
Easy Application: Brush, roller, or trowel – no special tools or mixing agents required

SUITABLE APPLICATIONS

Dampfix^® 1K is ideal for waterproofing in both residential and commercial construction, including:
Internal: Bathrooms, showers, laundries (under tile), kitchens and splash zones, floors and walls in wet areas
External: Retaining walls, balconies and terraces (with appropriate topping or tile finish), planter boxes, water tanks, and potable water containment
Below-Ground: Basement walls and floors, lift pits

Dampfix^® 1K combines the reliability of cementitious waterproofing with the simplicity of a one-part system — just add water and apply. Whether you're working on wet areas, external decks, or below-ground retaining structures, it delivers outstanding protection against both positive and negative water pressure.

With potable water approval and compliance with multiple Australian Standards, it’s the go-to solution for waterproofing professionals who demand performance, compliance, and versatility. 

Download the TDS for mixing instructions, surface prep, and technical data.