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How to waterproof a retaining wall  

SikaTite UnderTile Water based synthetic rubber waterproofing membrane for under-tile, and protected applications.  

Product Description

SikaTite UnderTile is a fast curing, single component, class 3 waterproofing membrane.  

Uses

Under-tile, or protected waterproofing for use on most building substrates including; concrete, render, screeds, wet area wall sheets, fibre cement sheets, brick and MDF.  

Characteristics / Advantages

  • Excellent adhesion to most substrates
  • Fast curing
  • Permanently flexible
  • Approved for use with CTA tile adhesives, and levelling systems (polymer modified adhesive acceptable)
  • Anti-Microbial protection
  • Low VOC
  • Easy clean-up with water and detergent prior to curing 

Approvals / Standards

Complies with Green Building Council of Australia VOC limit requirements (250g/L)  

Product Data Form

Appearance / Colour Thixotropic liquid / Standard grey

Packaging 1, 4 and 15L pails

Storage Storage Conditions / Shelf Life Store in original, unopened and undamaged, in dry conditions at temperature between +10°C and 35°C. A shelf life of 12 months from the date of production is achieved when stored in accordance with the above recommendations.  

Technical Data

Chemical Base One component, moisture triggered synthetic rubber

Solid Content ~ 60% by weight (+23oC / 50% r.h.)  

System Information System Structure

  • Consumption
  • Build-up Minimum of two coats at >= 0.8 litre / m2 applied, with second coat at 900 to the first coat
  • Wet Film Thickness ~ 0.8mm per coat
  • Dry Film Thickness For 1.0mm DFT (minimum)
  • * consumption figures are theoretical and do not allow for any additional material due to surface porosity, surface profile, variations in level and wastage etc. 

Substrate Preparation

Concrete / Cementitious Substrate, For standard applications concrete should be cured for at least 28 days and be free of dust, dirt, curing compounds and other contaminants. Any cracks or voids larger than 1mm should be filled

Other substrates, Should be free of dust, dirt, and other contaminants.  

Priming

Substrate

Primer

Overcoat time

Normal

Normally not required *)

N/A

Porous

SikaTite Porous Primer

30 minutes

Non-porous

SikaTite Non-Porous Primer

30 minutes

Moist, or Green (to 93% RH)

SikaTite Moisture Seal 1K, or SikaTite Moisture Seal 2K*

15 minutes for second coat (0-90% R.H.) 45 minutes for third coat (90-93% R.H.) Overcoat with SikaTite membrane after 1 hour

note: times are based upon ambient / substrate temperature and relative humidity of 18oC & 50%  

Application Conditions / Limits

Substrate Temperature min. +10oC; max. +35oC

Ambient Temperature min. +10oC; max. +35oC

Ambient Humidity max. 85% r.h.

Dew Point Beware of condensation! The substrate and uncured membrane temperature must be at least 3oC above the dew point to reduce the risk of condensation or blooming on the membrane finish.  

Application Instructions

Application Method SikaTite UnderTile can be easily applied by brush or roller. Care is to be taken to ensure that minimum material consumption is met per the Consumption table.

Floor Wall Joints Joints must be treated either using SikaTite ElastoJoint bandage system, or using SikaSil Pro, or other Sika neutral cure silicon. If SikaSil is used it must be left for minimum 24 hours at 180 C before it can be overcoated with SikaTite UnderTile membrane.

Terminations Where a terminating sealant is required, such as around windows, Sikaflex Clear should be used.  

Application Tools By brush: with a soft bristle brush By roller: with a solvent resistant, non-shedding synthetic nylon roller

Cleaning of Tools Clean all tolls and application equipment with water and detergent immediately after use. Hardened and/or cured material can only be removed mechanically.  

Curing Details

Overcoating Window

Overcoat 4-6 hours

Tile 48 hours

*~23°C / 50% r.h. ** recommended for use with CTA tiling adhesives.

Note: times are approximate and will be affected by the layer thickness, the substrate temperature.  

Notes on Application / Limitations

SikaTite Non-Porous Primer should be used on metal substrates SikaTite Elastojoint bandages, corners, and tap flanges recommended for detailing Not to be used on substrates with rising damp Contact Sika Technical Support team for further advice as required  

Value Base

All technical data stated in this Product Data Sheet are based on laboratory tests. Actual measured data may vary due to circumstances beyond our control.  

Health and Safety Information

For information and advice on the safe handling, storage and disposal of chemical products, users should refer to the most recent Material Safety Data Sheet containing physical, ecological, toxicological and other safety-related data.  

Important Notification

The information, and, in particular, the recommendations relating to the application and end-use of Sika’s products, are given in good faith based on Sika’s current knowledge and experience of the products when properly stored, handled and applied under normal conditions. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchant-ability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The proprietary rights of third parties must be observed. All orders are accepted subject of our terms and conditions of sale. Users should always refer to the most recent issue of the Technical Data Sheet for the product concerned, copies of which will be supplied on request


 

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