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How to waterproof a retaining wall  


The surface should be free of holes and gaps.
An elastomeric polyurethane sealant / mastic should be applied to all wall/ floor, wall/wall corners, waste outlets, bases of penetrations and around flanges so that it forms a suitable flexible fillet which should be allowed to dry.
Likewise gaps, cracks and holes should be suitable filled, possibly using a elastomeric polyurethane sealant / mastic.
Expansion gaps, large cracks and joins should be filled with a suitable elastomeric polyurethane sealant / mastic and allowed to cure. A 50mm bond breaker tape should be laid over the join. The membrane consisting of a base coat, 150mm wise (or wider) reinforcing fabric embedded into the wet coat, a saturating coat (ensuring that the fabric is completely saturated and covered and allowed to dry followed by a final coat should be applied.
If puddle flanges are used, they should be rebated into the surface to allow water to readily drain via the waste outlet.


Primeseal MC is recommended applied at approximately 4 sq.m. per litre and allow to fully dry. For non critical areas priming with WB Primer will suffice applied at 4 sq.m. per litre.
Timber surfaces must be primed with Primeseal MC.
Metal surfaces must be primed with a suitable metal primer and rust converter or solvent borne bitumen primer. Mild steel should not be directly coated.
Highly porous surfaces mat require an additional coat of primer.
If there is a risk of entrapped moisture in the substrate, it should be primed with at least 1 good coat of Primeseal MC.


Apply by brush, roller or soft broom, usually in two or more coats. The succeeding coats should be applied at right angles to the preceding coats. For best results allow each coat to dry then apply next prior to the surface becoming contaminated. If subsequent coats are applied to 'non-cured' coats inter-coat bubbling may result.
In used unreinforced the minimum dry film thickness must be 1mm.
Bituflex can be used fully reinforced using fibreglass or Durascrim (polyester fabric). Ensure that the fabric is free of bubbles and wrinkles and is fully saturated and covered.


The stated average coverage rate may vary depending upon type, condition, porosity, texture of the surface and application technique.


Unreinforced: 0.75 to 0.8 litres per sq.m. per coat. Combined coats 1.5 to 1.6 litres per sq.m.

Reinforced: 1.0 litres per sq.m. per coat. Combined coats 2.0 litres per sq.m.

Bituflex is a water-based 'rubberised' latex / bituminous waterproofing compound incorporating elastomers and reinforcing agents. It is formulated to a brushable consistency, but with sufficient body to provide a high build waterproofing membrane. Bituflex is user friendly and non-hazardous. Although black in colour it will not stain grout or tiles and it will not re-emulsify after fully curing.
Bituflex is designed as an economical waterproofing solution for many applications which are to be covered, tiled or topped including:
Wet Area
Retaining walls.
Decks, patios, balconies, terraces etc.

Suitable Surfaces


Bituflex is suitable on most commonly used construction substrates. These substrates should be sound, stable, clean, dry and free of loose matter and contaminants:
Cement render
FC sheeting and compressed sheeting
Plaster board

Bituflex can be applied to damp surfaces but freedom from surface water and continual dampness is essential. The product will not cure if surface remains damp.



The information contained in this data sheet is general in nature and refers only to the usual use of the product and it should not be construed to be a complete specification. Site conditions vary which may require the use of the products and related products to vary. For specific projects a written specification should be sought from the Company.


Bituflex is not designed for exposure to the sun.
Bituflex will not become waterproof until it had fully dried and cured. Protect from rain until it has cured.
Bituflex is not compatible with acid based sealants. Ideally Bituflex should be coated with Wrimco Primeseal before applying sealant to it. Neutral cure sealants are preferred.
Bituflex is not a trafficable membrane.

Benefits and Advantages

Bituflex is:
Easy to apply.
Excellent adhesion.
Will not stain grout and tiles after proper tiling.
Compatible with most tile adhesives.

Precautions in Use


Do not apply in areas exposed to the weather if rain is imminent.

Priming and 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.



Dries black.

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.


Generally at 25oC at 50RH:
Touch dry: 4 to 6 hours
Fully dry: 12 to 24 hours.
Full cure: 36 hours


Keep in cool dry conditions.
Do not let product freeze.
Product is non flammable and non-hazardous.

Clean Up

Wet spills can be cleaned with water.

Tiling, Topping or Top Coating

Bituflex is compatible with most tile adhesives. Ensure adhesive is compatible with flex of the surface.
Do not tile until product has fully cured. Rubbing with damp cloth that produces no stain indicates full cure.
Adequate expansion joins should be installed in accordance with good tiling practice as per AS3951.1:1991.
Bituflex can be topped with sand:cement topping.

Safety & Precautions


The use of gloves and goggles against splashes are recommended.
If in eyes, flush thoroughly with clean water, holding open to ensure trapped product may be flushed away.
If swallowed, give water to drink and seek medical advice.
If inhales, unlikely due to products viscosity, remove to fresh air and apply artificial respiration if required and seel medical attention.
If on skin, remove contaminated clothing and wash skin with soap and water.


For full safety data refer to the products Material Safety Data Sheet. Observe precautions as per label.

Tests and Technical Data


Tested and approved by ABSAC under Durabit.
Solids:  50% to 55%
   Hydrostatic pressure resistance: 180Kpa
Elongation: > 450%

Application temperature range: 10 oC to 35 oC


Waterproofing FAQ

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Waterproofing Coating

Waterproof Drainage Sheet

Waterproofing Primer

Repair and Maintenance