SikaScreed®-538

6 months from date of production

Store in undamaged, unopened, original sealed packaging in dry conditions at temperatures between +5°C and +35°C. Protect from direct sunlight, heat and moisture.

~2.13 kg/l (mixed material, at 25°C)

Hand application: 4 mm min. / 40 mm max.

Machine application: 6 mm min. / 40 mm max.

+5°C min. / +35°C max.

3.5 L of water per 20 kg bag

Working time at 23°C: ~30 min.

Note: Times are approximate and will be affected by changing substrate and ambient conditions, particularly the temperature and relative humidity.

As a guide: ~2.13 kg of mixed material per m² per mm thickness.

This figure is theoretical and does not include for any additional material required due to surface porosity, surface profile, variations in level or wastage, etc.

A 20 kg bag of SikaScreed®-538 mixed with 3.5 L of water yields ~11.1 L.

Substrate must be clean and free of oil, sealers, curing compounds, paint, polymer coatings, dust or other foreign (contaminating) matter.

Remove all weak or broken pieces of concrete. If necessary, employ mechanical cleaning methods and equipment. If sealers, paint, polymer coatings or curing compounds are present on concrete substrate, remove with mechanical shot blasting equipment.

SikaScreed®-538 is best applied where the application temperature is between 5°C and 35°C. Outside this range, please refer to your local Sika Technical Representative.

Voids and cracks (water pipes, holes, drainage pipes etc) should be filled to prevent seepage through to lower levels. Consult with your local Sika Technical Representative for product recommendations.

PRIMING

The substrate shall be saturated with SikaCeram® P 302 and mixed with water 1:1. Use at least 0.2 L (approx.) of the primer for the initial priming (1:1). Allow to dry until a transparent film has been formed. Absorbent substrates should be primed twice. The second coat approx. 0.07 L / m².

Mechanical mixing is required for SikaScreed®-538. For small areas, a slow speed stirrer of not more than 600 rpm fitted with a helical paddle, is suitable. Mixing time is 3 minutes.

Place the required quantity of water into the mixing vessel. Whilst mixing, slowly add the powder to the water within 2 minutes then mix for a further 1 minute. Allow mixed SikaScreed®-538 to stand for 3 minutes and then remix prior to application.

Use chilled water at high temperatures for longer application time.

For improved efficiency and continuous production of SikaScreed®-538, it is recommended to use at least two mixing buckets.

For larger jobs, the use of a mechanical mixer/pump unit is recommended. Refer to your local Sika Technical Representative for suitable machines.

Pour mixture over substrate or pump through a suitable pump to desired thickness. 

Whether pouring from a mixing vessel or using a mechanical mixer with an application hose, the discharge point should be approximately 200 mm from the floor to prevent splashing and air entrapment.

Progress should be steady and even. Application should take place continuously into the preceding wet material to ensure even thickness and flow. Do not make new edges and ‘fill in’ the middle.

The fresh wet topping can be rolled immediately with a suitable long spiked roller to release all air retained within the underlayment. Do not roll material that has been applied for more than 2-3 minutes.

SikaScreed®-538 is self-curing, but as with all cementitious products in hot weather, take adequate measures to protect it from exposure to direct sunlight and hot winds. DO NOT use water spray or liquid membrane curing compounds as these may affect the surface texture or prevent bonding of subsequent adhesives used with floor coverings.

Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.