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. Porous dry surfaces must be primed using Sikafloor® -01 Primer. Highly porous and dusty substrates must be primed with Sikalastic® Moisture Seal, damp green substrates must be primed with 2 coats of Sikalastic® Moisture Seal (refer to PDS for consumption rates). Dense and impervious substrates must be primed using ECO SYSTEMS® Prep 'N' Prime.
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. Prime the substrate with either Sikalastic® Moisture Seal or Sikafloor® -01 Primer. (refer to individual PDS for consumption rates)
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. Moisture content should be below 4% before membrane application. Prime the substrate with either Sikalastic® Moisture Seal or Sikafloor® -01 Primer. (refer to individual PDS for consumption rates)
Building Boards
Water resistant plasterboard, fibrous cement sheeting must be solidly fixed in accordance with the manufacturer's instructions specifically for tiling. The area must be primed with Sikafloor® -01 Primer or Sikalastic® Moisture Seal, particularly where jointing compound has been used.
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.
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
Sika® Tite WPU is a Class III membrane with high extensibility and is designed for use with a 12mm Bond Breaker. Sika® Neutral Cure silicone or Sikaflex® Fillet must be tooled off to a minimum 12mm wide as per table 3.2 in AS3740-2010. 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.
TILING
Sika® Tite WPU is compatible with a range of Sika® CTA® and Davco® polymer modified tile adhesives, Contact Sika Technical Service for further advice.
