All new concrete slabs must have a wood float finish and be allowed to cure for at least 6 weeks Old concrete must be cleaned with a strong commercial grade detergent or degreaser. Residue must then be thoroughly washed off with clean water. Allow the surface to dry for at least 24
hours. If the concrete (new or old) has a steel trowel or power float finish, it must be mechanically abraded to expose the aggregate. Laitance must be removed prior to application.
Renders & Screeds:
New rendered or screeds surfaces must have a wood float finish and be allowed to cure for at least 7 days.
Light Weight Block / Hebel, and Cement Coated Polystyrene Boards:
Prime the surface with 2 coats of suitable Sika primer
- Metal drain connections and PVC puddle flanges Shall be lightly abraded and then cleaned
- Apply a coat of Sika® Prep N Prime and allow to dry
Construction Sheeting & Boards:
- Standard wall / floor building boards must be primed with a Suitable SIka primer and firmly fixed in accordance with manufacturer’s instructions and appropriate Australian Standards. Such boards include plasterboard, fibre cement sheeting, marine grade ply and wet area composition board. Check with manufacturer of other building boards for their suitability.
- Screw or nail heads must be sealed with a Sika® Neutral cure sealant.
- All sheeting joints, seams, penetrations and wall/floor junctions shall have a Sika® Neutral cure sealant applied.
All surfaces to be waterproofed must be firm, clean, dry, structurally sound and smooth. All grease, oil, wax, curing compounds, dust, loose material, laitance and other contaminants must be removed. All projections and rough spots should be dressed off to achieve a flat surface. The substrate surface must be continuous and not pond water with adequate falls to waste as required.
All substrates shall be primed prior to the application of Sika® Aqua Blok® Rapid
||Eco Prime WB
Siklastic Moisture Seal
|Non Porous Substrates
||Sika Prep n Prime
|Early aged screeds and concrete
||Sikalastic Moisture Seal
Static Crack and Sheet Joint Treatment:
For static cracks 0.5–3 mm wide rout out and clean thoroughly before filling with Sika® Neutral Cure Silicone to form a bond breaker. For all sheet joints and seams clean thoroughly and fill with a Sika sealant to form a bond breaker, apply a liberal coat of Sika® Aqua Blok® Rapid extending 100 mm either side of the crack/joint and place bandage into the wet membrane, press down firmly to ensure good contact, apply another liberal coat of Sika® Aqua Blok® Rapid to the entire surface to embed the bandage. For dynamic cracks, expansion joints and control joints contact Sika® technical service for advice.
Suitable sealants include;
- Sika Neutral cure silicone
- Sikaflex® Fillet
AquaBlok® Rapid has high extensibility and is designed for use with a 12 mm bond breaker, a bead of Sika® Neutral Cure Silicone must be tooled off to form a 12 mm wide bond breaker. A bond breaker must be installed at areas subject to movement, wall/wall junction, wall/floor
junction, sheet joints and seams, penetrations and where there is a change in the direction or substrate type.
Suitable Bond breakers include;
- Sika Neutral Cure silicone
- Sikaflex® Fillet
Ensure bond breakers are adequately cured in accordnace to product datasheets.
CLEANING OF EQUIPMENT
Clean tools and equipment with clean water while the material is still wet. Cured coating can only be removed mechanically.