Sikalastic® WPU

AS 4858-2004: Wet Area Membranes

BRANZ Appraisal- Interior applications

BRANZ Appraisal- Exterior applications

12 months from date of manufacture in original, sealed containers, if the storage conditions are met.

Store in dry, weatherproof environment, protected from direct sunlight at temperatures between +5˚C and +25˚C

43Grams/Litre- Low VOC                                          (SCAQMD method 304-91)

2.52 MPa

~ 3.29g/m2/24hr

2x coats of 750 Micron (Wet film) to acheive a DFT of 1mm

Allow Sikalastic® WPU 2-3 hours to dry between coats. Allow longer in adverse weather conditions.

Allow a minimum of 10 hours curing prior to applying finished covering, and a minimum of 3 days to cure before flood testing. Flood testing is dependent on site specific conditions and may require longer cure times than 3 days, please ensure material is well cured before proceeding.

10m2 per drum (1mm DFT)

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 provide falls to waste as per AS3740-2010 and AS4654.2-2012.

Priming

Concrete

Allow at least 28 days for the concrete to cure. Concrete should be left with an open surface. 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 7 days. Moisture content should be below 4% before membrane application. 

Building Boards

Water resistant plasterboard and fibrous cement sheeting must be solidly fixed in accordance with the manufacturer's instructions specifically for tiling. 

Non Porous Substrates

It may be necessary to mechanically prepare the area. Any existing tiles must be well bonded and be free from any sealers or coatings. Dense, low absorbent and impervious surfaces must be primed with ECO SYSTEMS® Prep 'N' Prime. Confirm adhesion and compatibility of the primer to the substrate before proceeding with membrane application.

Static Crack & Sheet Joint Treatment

For static cracks 0.5 – 3mm 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 Sika® Neutral Cure silicone to form a Bond Breaker. 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

Sikalastic® WPU is a Class III membrane with high extensibility and is designed for use with a 12mm annulus bond breaker at floor/wall and wall/wall junctions. 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. 

Clean tools and equipment with clean water while the material is still wet. Cured coating can only be removed mechanically.