SikaScreed® HardTop-65

• VOC emission classification GEV-Emicode EC1^PLUS, licence number 11162/24.02.97

• CE Marking and Declaration of Performance to EN 13813 - Resin screed material for internal use in buildings.
• CE Marking and Declaration of Performance to EN 1504-3 - Concrete repair product for structural repair.

EN 13813: Class CT-C65-F7-A6

Complies with the general requirements of EN 1504-3: Class R4: Method 3.1, 4.4 7.1^* and 7.2^*

*  Principle 7: provided that the repair system includes a surface protection system with proven protection against carbonation or is a PC mortar.

Special cement binder with fibres and hard aggregates

9 months from date of production

Product must be stored in original, unopened and undamaged packaging in dry conditions at temperatures between +5 °C and +30 °C. Always refer to packaging.

Dmax: 3,2 mm

~1,50 kg/L

Bonding bridge

• SikaScreed®-20 EBB (on dry or matt damp substrates)

Screed

• SikaScreed® HardTop-65

Refer to the following system data sheet:

• Sikafloor^® HardTop CM-65 Rapid

12 % water addition performed on a power floated surface

Value in combination with bonding bridge: SikaScreed^®-20 EBB

A1_fl

~3,0–3,75 L of water for 25 kg of powder

8–100 mm

Minimum thickness guidelines:

*  Loading / use of the floor and the presence of underfloor heating will determine the thickness of the screed. Minimum thickness indicated is for unheated and lightly loaded floors. Also refer to the Sika Method Statement SikaScreed® HardTop- range.

+10 °C min. / +25 °C max. (fresh mortar)

+10 °C min. / +30 °C max.

+10 °C min. / +30 °C max.

~30 min. (± 5 min) at +20 °C

Start surface finishing/smoothing ~90 minutes after application. Finishing time is comparable to concrete finishing. After surface finishing/smoothing, the specific system resin-based flooring primer may be applied. Also refer to System Data Sheet Sikafloor^® HardTop CM-65 Rapid. If a resin build-up is not required, a polythene sheet must be used as protective covering.

Times are approximate and measured at +20 °C and > 50 % r.h. Application times will be affected by changing substrate and ambient conditions, layer thickness and water content.

~18 hours (without coating or impregnation application). Time is approximate and measured at +20 °C and > 50 % r.h. Time will be affected by changing substrate and ambient conditions, layer thickness and water content.

~2,0 kg/m² per mm. This figure is theoretical and does not allow for any additional material due to surface porosity, surface profile, variations in level or wastage etc.

Select the most appropriate equipment required for the project:

SUBSTRATE PREPARATION

• Abrasive blast cleaning or planing / scarifying equipment

MIXING

Small - medium volumes

• Mixing containers
• Weighing scales
• Water containers
• Water measuring container
• Electric single or double paddle mixer (<500 rpm) with spiral paddle
• Forced action mixer or rotating pan, paddle or trough type

Free fall mixers must not be used

Large volumes

• Weighing scales
• Water containers
• Water measuring container
• Forced action mixer or rotating pan, paddle or trough type.
• Continuous mortar mixer and integral delivery pump with associated hoses i.e. inoCOMB Cabrio 0,2

Free fall mixers must not be used

APPLICATION

• Mixed material carriers/carts (wheel barrows)
• Spreading equipment
• Height levelling equipment
• Dabble bar

SURFACE FINISHING

• Hand trowels
• Walk behind power trowels ( disc and blade types)
• Finishing brooms

CURING

• Polyethylene sheeting
• Specific rapid coating

Small - medium  volumes

Pour the minimum recommended clean water quantity into a suitable mixing container. While stirring slowly with electric paddle mixer, add the powder to the water and mix thoroughly for at least for 3 minutes adding additional water if necessary, to the maximum specified amount and adjust to the required consistency to achieve a smooth consistent mix. The consistency must be checked after every mix. 

Large volumes

Pour the minimum recommended clean water quantity into the forced action mixer / rotating pan or continuous mortar mixer and integral delivery pump. Add the powder to the water and mix thoroughly for at least for 3 minutes to achieve a smooth consistent mix. The consistency must be checked regularly and included in a jobsite quality control plan. Compare mixing consistency with drill and mixing paddle technique.

Pumping
When using a mortar pump with appropriate equipment (Inotec - InoCOMB). Set up the equipment to achieve a smooth consistent mix. Control the water dosage to achieve the required consistency. Compare mixing consistency with drill and mixing paddle technique.

Strictly follow installation procedures as defined in method statements, application manuals and working instructions which must always be adjusted to the actual site conditions.

Prior to application, confirm substrate moisture content, relative air humidity, dew point, substrate, air and product temperatures.

BONDED SCREEDS

Bonding bridge

SikaScreed®-20 EBB: To the prepared dry or matt damp substrate without any standing water. Apply SikaScreed® HardTop-65 ‘wet on wet’ within 30 minutes of mixing (+20 °C). Also refer to SikaScreed®-20 EBB Product Data Sheet.

Note: If the SikaScreed®-20 EBB bonding bridge has dried, it must be removed mechanically and replaced before application of SikaScreed® HardTop-65.

Bonded, unbonded and floating Screeds

Pour mixed SikaScreed® HardTop-65 onto prepared substrate and apply evenly to the required thickness using appropriate spreading equipment.

Level surface with screed bar /straight edge

Surface finishing
The finishing must be carried out using finishing tools to the required surface texture.
To obtain optimum surface strength, finish SikaScreed® HardTop-65 with suitable equipment such as trowels or walk-behind power floats. Do not use heavy ride-on trowelling machines.

It is possible to float the surface several times up to a very smooth surface to achieve high abrasion resistance values.  For this requirement, initial finishing process must be carried out using a disc power float. Extended surface smoothing must then be completed using a walk behind helicopter / blade type power float.

Small areas which are difficult to access and where optimum surface strength is not required, use hand trowels.

Apply Sikafloor®- 140 W Trowelling Primer between screed layers if additional layers are required. Refer to the System Data Sheet: Sikafloor® HardTop CM-65 Rapid.

Curing

Curing must start after the last finishing operation using polyethylene sheeting or the application of a suitable system primer. Refer to appropriate System Data Sheet.

Curing with polyethylene sheeting must be maintained for at least 18 hours. At temperatures between +10 °C and +15 °C (substrate and air) the screed must be cured with polyethylene sheeting for at least 24 hours. The ambient and subfloor temperature during application and setting (48 hours) of the SikaScreed® HardTop-65 must be always ≥ 10°C.

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