Durabit EF (EF is for Extra Flexible ) a water based, polymer emulsion waterproofing membrane. It has been tested by CSIRO (report 2947) and meets the criteria of AS4858:2004 Wet Area Membranes. Durabit EF is an elastomeric, environmentally friendly membrane designed for both internal and (non-exposed)external applications. It cures to form a durable, odourless, impervious, seamless membrane that resists re-emulsifying after it has fully even if immersed in water. Durabit EF, available in white, black, grey and blue, does not stain grout or tiles and has excellent resistance to hydrostatic pressure.
Durabit EF has been formulated for most waterproofing applications requiring long term waterproofing and meets the criteria of AS4858:2004 Wet Area Membranes and Contact With Drinking Water Test AS/NZS4020:2002 making it ideal for:
• Shower recesses & wet areas.
• Tiled or topped – decks, terraces, balconies, podiums, roofs.
• Retaining walls, planter boxes.
• Water tanks and immersed conditions.
Durabit EF is suitable for suitably primed: Concrete, cement, cement render, block work, brick, masonry, FC sheeting and CFC sheeting, plaster board and timber, plywood and particle board (if primed which Duram Primeseal) and metal (if primed with a metal primer).
Note: We do not regard particle board as a suitable substrate for wet areas and if possible should be replaced or covered with CFC sheeting – particularly in shower recesses. If covered we recommend that the particle board be coated with 2 coats of Duram Primeseal and joins and corners sealed with a polyurethane sealant prior to laying the CFC sheeting. Durabit EF may be applied to slightly damp surfaces but the product will not fully cure if the surface remains damp. This process takes longer than if the surface was allowed to dry before application. The surface must dry before the membrane can dry. Freedom from surface water, continual dampness is essential.
The information contained in this product data sheet is typical but does not constitute a full specification as conditions and specific requirements may vary from project to project. The instructions should be considered as a minimum requirement but the applicator or contractor must use their skill, knowledge and experience to carry out additional works as may be necessary to meet the requirements of the project. Specification for specific projects should be sought from the Company in writing.
Durabit EF is not designed for long term direct exposure to UV and should be tiled, topped or painted. Durabit EF is not designed as a trafficable membrane although infrequent maintenance foot traffic would be acceptable.
Benefits and Advantages
Durabit EF a versatile membrane suitable for many demanding waterproofing applications:
• It meets the criteria of AS4858:2004 and is applied in
accordance with AS3740.
• Not a hazardous product and not flammable. Water based.
• Permanently flexible (tested to class 111 – highest tensibility).
• Suitable for contact with drinking water.
• Formulated for wet area and under tile applications.
• Does not re-emulsify after proper curing.
• Tough, durable and flexible.
• Dries fast.
• Compatible with most tile adhesives.
• Easy to apply.
• Virtually odourless.
• Will not stain grout or tiles.
• Available in range of colours.
Priming and Surface Preparation
Good preparation is essential. Surfaces must be sound, stable, dry, clean and free of dust, loose, flaking, friable material and substances that may diminish adhesion.
Surfaces must be suitably primed with Duram Primeseal applied at no less than 1 litre per 4m² and allowed to dry. Duram Primeseal must be used for roof and exposed areas, timber and particle board surfaces, bitumen or where there is a risk of entrapped moisture in the substrate which may cause the membrane to bubble.
Priming is ad equate if the surface has a solid off-white appearance. Particle board and bitumen surfaces must be primed with 2 coats of corner angels under wall boards, they should be securely embedded in to a continuous, gap free bed of a polyurethane sealant / mastic.
Stir well. Apply by brush, roller, soft broom or spray. Apply in a minimum of two coats. To perform correctly the dry film
thickness of the membrane must be at least 1mm to 1.2 mm. Durabit EF is suitable for use with a reinforcing fabric (Durascrim).
The stated average coverage rate may vary depending upon type, condition, porosity, texture of the surface and application technique.
Unreinforced: Minimum 1.5 litres per sq.m., i.e 0.75 litres per m²
per coat. A 20 litre pail will cover 13 sq.m. for 2 coats.
Reinforced: Minimum: 2.0 litres per m².
The dry film thickness of the membrane must be at least 1mm.
Minimum 1 litre per 4m².
Durabit EF is available in white, grey, blue, black. Special colours available upon request but minimum orders will apply.
Drying and Curing
Drying and curing of the product is affected by type, dryness and porosity of the surface, temperature, humidity, ventilation, climate conditions and application technique and therefore drying and curing can only be given as a guide. Durabit EF is a fast drying water based product. Expected curing at 25ºC at 50% RH: Touch dry – 4 to 6 hours per coat. Set – 12 hours. Full cure 5-7 days depending on application and conditions. Contact manufacturer for further advise. Ensure
membrane is fully cured before tiling or topping.