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 ECO SYSTEMS® Eco Prime WB. Highly porous and dusty substrates must be primed with Aqua Blök® Epoxy Prime 2K, damp green substrates must be primed using SikaTite® Moisture Seal 2K. 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 – 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 free from any movement. 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.
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 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
Aqua Blök® WPU is a Class III membrane with high extensibility and is designed for use with a 12mm Bond Breaker, a bead of Sika® Neutral Cure silicone must tooled off to form a 12mm 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.
TILING
Compatible with a range of Sika® CTA® polymer modified tile adhesives, Contact Sika Technical Service for further advice.
