Aqua Blok WPU 15Ltr Grey

Waterbased polyurethane waterproofing

$175.00 inc GST




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.



Concrete Sand / cement screeds Cement render Fibrous cement sheeting Structural particle board sheeting Compressed fibrous cement sheeting Water resistant platerboard Structural plywood sheeting.



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






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.



Apply two coats to achieve a minimum dry film thickness of 1mm.

Application coverage rate of 0.75mm wet film thickness per coat.



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


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 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.


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



Sika AQUA BLOK WPU Data Sheets


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Colour accuracy disclaimer: We have taken care to display the most accurate visuals of our products. However, we are not responsible for the colour accuracy of the device you are viewing our swatches on. These variations arise due to different computer monitors and devices (make, model and technology, as well as resolution, contrast and brightness control settings) in much the same way a scan will differ from an original image and a colour photocopy. Furthermore, coatings can exhibit variation in perceived colour depending on gloss level and application method. If you require a very specific colour match, please make your selection via actual swatches and colour boards available at our showroom.

Product Disclaimer: Ensure you read all product, technical and safety data sheets prior to application as liability falls on the applicator. All products must be applied in accordance with manufacturer’s recommended method.