Description
Aqua Blök® WPU is a premixed, single component, waterbased polyurethane waterproofing membrane. Aqua Blök® WPU has High Extensibility and forms an elastomeric, seamless waterproofing membrane for use in internal and external applications for under tiled finishes including shower recesses, bathrooms, laundries, decks, balconies, podiums and rooftops. Aqua Blök® WPU has low VOC’s and bonds to a wide variety of substrates. Aqua Blök® WPU contains micro fibre reinforcement for improved tensile strength and crack bridging.
USES
Concrete Sand / cement screeds Cement render Fibrous cement sheeting Structural particle board sheeting Compressed fibrous cement sheeting Water resistant platerboard Structural plywood sheeting.
CHARACTERISTICS AND ADVANTAGES
High Extensibility >300% Micro fibre enhanced reinforcement Internal and external applications One part – No mixing, ready to use Water based – Low VOC’s, Non hazardous Compatible with Sika® and CTA® range of tile adhesives
Colour
Grey
Packaging
15 Litre plastic pails
Curing time
Allow a minimum of 12 hours curing prior to applying finished covering, and a minimum of 3 days to cure before flood testing. Allow longer in cool or cold weather conditions.
Waiting time to overcoating
Allow Aqua BlÖk® WPU 2-4 hours to dry between coats. Allow longer in adverse weather conditions.
Consumption
Apply two coats to achieve a minimum dry film thickness of 1mm.
Application coverage rate of 0.75mm wet film thickness per coat.
APPLICATION INSTRUCTIONS
Substrate Preparation
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 level surface. The substrate surface must be continuous and not pond water.
Priming Guide:
| Substrate | Primer |
| Porous substrate | Eco Prime WB
Davco Ultraprime |
| Dense concrete | Davco PrimeX |
| Earlier aged screeds | Sikalastic Moisture Seal |
| Non porous substrates | Sika Prep n Prime |
Concrete
Allow at least 28 days for the concrete to cure. Concrete should be left with an open surface – standard wood float or broom finish. All traces of curing compounds or sealers should be removed prior to application. Old concrete must be thoroughly cleaned and washed and allowed to dry. The surface should be even unless falls are incorporated where required, imperfections to be repaired with a suitable Sika® MonoTop repair mortar.
Sand / Cement Screeds and Renders
The screeds and / or renders must conform to the appropriate standard and should be left with a wood float finish and left to cure for at least cure for 7 days.
Building Boards
Water resistant plasterboard, fibrous cement sheeting, marine ply must be solidly fixed in accordance with the manufacturer’s instructions specifically for tiling. The area must be primed with ECO SYSTEMS® Eco Prime WB, particularly where a jointing compound has been used.
Particleboard
Particleboard must be fixed in accordance with the manufacturer’s instructions specifically for tiling and meet minimum deflection standards for tiling. Secure floor with additional fixings and wedges, sand any surface contamination after initial preparation. The area must be primed with ECO SYSTEMS® Prep ‘N’ Prime.
Static Crack & Sheet Joint Treatment
For static cracks 0.5 – 3mm wide rout 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 Sika® Neutral Cure silicone to form a Bond Breaker, apply a liberal coat of Aqua Blök® WPU extending 100mm either side of the crack and place Aqua Blök® reinforcing bandage into the wet membrane, press down firmly to ensure good contact, apply another liberal coat of Aqua Blök® WPU to the entire surface to embed the bandage. For dynamic cracks, expansion joints and control joints contact Sika® technical service for advice.
BOND BREAKER / CONNECTOR SEALANT
Suitable bond breaker: Any Sika neutral cure silicone sealant
Suitable connector sealant: SikaFlex Fillet or SikaFlex construction AP
Cleaning of Equipment
Clean tools and equipment with clean water while the material is still wet. Cured coating can only be removed mechanically.
Sika AQUA BLOK WPU installation diagrams
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Sika AQUA BLOK WPU Data Sheets
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