High performance, floor levelling and fast drying, latex modified cementitious screed for indoor use 6mm to featheredge. Domestic to Light Commercial. SikaLevel-25 Latex Self Levelling is a 1-part ready to use protein free cement based self leveller for floor smoothing and levelling uneven rigid internal floors prior to applying final wearing coverings such as carpets, sheet vinyl, lino, tiles, laminates and timber.
SikaLevel-25 Latex Self Levelling is a floor levelling compound to level or smooth screeds and concrete floors at a thickness between 6mm to featheredge. Suitable for foot traffic only
Characteristics / Advantages
- Self smoothing and highly fluid
- Easy to place by pump or manual application
- SikaLevel-25 Latex Self Levelling is ready for use.
- Low shrinkage.
- Maintains good workability and joint healing throughout its pot life
- Fast setting and drying
- 2-4hours walk on time(+20°C)
- Good surface appearance and hardness
- Excellent freeze-thaw salt resistance
- Protein and Formaldehyde free
- Underfloor heating applications beneath heating cables/pipes or on top of heated screeds
Approval / Standards
Conforms to the requirements of EN 13813 C30 – F6
Storage Conditions / Shelf Life
9 months from date of production if stored properly in original, unopened and undamaged sealed packaging in dry conditions at temperatures between +5°C and +35°C.
Suitable for use with under floor heating systems (not for embedment)
The one part acrylic primer Sika® -Level-01 Primer is recommended for a pore free surface with very good surface adhesion. Please refer to the relevant PDS for the recommended application details etc. SikaBond PVA (1 part PVA to 4 parts clean water) may also be used
Apply to the required thickness up to 6mm
25kg will cover approx. 5m2 @ 3mm 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.
The concrete substrate must be sound and of sufficient compressive strength (min. 25 N/mm2) with a minimum pull off strength of 1.5 N/mm2.The Surface must possess an effective damp proof membrane.
The surface should be free from residual adhesives, damp proof membranes, oil, grease, wax, loose flaky paint, dust, laitance etc. that could reduce adhesion.
Switch off underfloor heating 24 hours before and after application. Ensure floor temperature is >5°C.
If in doubt apply a test area first.
Substrate Preparation / Priming
Weak concrete must be removed and surface defects such as blow holes and voids must be fully exposed.
Repairs to the substrate, filling of blowholes/voids must be carried out using appropriate products such as Sika Concrete Repair Mortar.
Normal Concrete / Screed: If the substrate is strong and has a sufficiently rough texture, SikaLevel 25 Latex Self can be applied directly onto the substrate. Avoid bubbles by dampening the substrate until a SSD (Saturated Substrate Dry) condition is achieved.
If the SSD option is chosen, the mechanically prepared concrete must then be thoroughly dampened during the 24 hours prior to the screed application by keeping at least 4 – 5 mm of water on the surface and letting it soak into the substrate. Remove the excess water prior to laying the screed. Any pores which may appear on the screed would mean that the substrate was not sufficiently saturated.
Porous / Concrete Screed: All dust, loose and friable material must be completely removed from all surfaces before application of the product, preferably by brush and/or vacuum. A suitable one part acrylic primer such as Sika® -Level-01 Primer. Please refer the relevant PDS. or alternatively seal the surface with SikaBond® PVA (1 part PVA to 4 parts clean water) ensuring surface is well coated, then allow to dry.
For highly porous substrates it may be necessary to apply more than one coat to prevent pinholes and cracking / debonding of SikaLevel-25 Latex Self.
Non Porous/Dense Substrates: (quarry/ceramic tiles, terrazzo and smooth concrete etc) Mechanically roughen surfaces by grinding or scarifying to provide a mechanical key – specialist advice and machinery may be required.
Alternatively, apply a bonding coat of undiluted SikaBond® PVA and allow to become tacky before applying levelling compound
+8°C min. / +35°C max.
+8°C min. / +35°C max.
Substrate Moisture Content
The substrate can be in a SSD condition, but there must be no rising moisture prior to the dampening operation according to ASTM D 4263 (Polyethylene-sheet test)
For further information please refer to the Product Data Sheet of the primer used.
Relative Air Humidity
< 75% max.
Beware of condensation!
The substrate and uncured floor must be at least 3°C above dew point to reduce the risk of condensation, blooming or cement laitance on the floor finish.
Unfilled (up to 6mm thick)
Mix SikaLevel-25 Latex Self Levelling with clean water only slowly adding 5 parts powder to 1 part water (25kg powder will require 5 litres / 5kg of water). Mix in a suitable clean container using a mechanical mixer with a spiral mixing paddle at slow speed until fully mixed and a smooth consistency achieved. Occasionally during hot weather the product may require remixing during the 15 – 20 minute pot life to reactivate the self levelling characteristics. DO NOT add extra water. Discard any unused material after 20 minutes from initial mixing.
Mix thoroughly for a minimum of 3 minutes.
Use an electric stirrer (< 500 rpm).
Application Method / Tools
Pump: Use a conventional floor screed dual stage mixer and pump and control the water dosage to achieve the required flow, measuring the final average flow diameter on a flat, clean, dry flow table.
After placing onto the surface, apply by trowel or pin screed rake to the required thickness.
The use of a spiked roller is not essential but it is recommended.
Roll thoroughly with a spiked roller in two directions to remove any entrapped air.
Manual: Pour the mixed material onto the primed surface and apply by trowel or pin screed rake to the required thickness. Roll thoroughly with a spiked roller in two directions to remove any entrapped air.
Cleaning of Tools
Clean all tools and application equipment with water immediately after use. Hardened / cured material can only be removed mechanically.
The temperature will affect the pot life.
Application at temperatures above +23°C will reduce the pot life and the working time. Temperatures below +23oC will increase the pot life and extend the working time.
Waiting Time / Overcoating
Suitable for overcoating with impermeable or moisture sensitive coatings after:
Layer thickness up to 10mm: 24h
Layer thickness up to 25mm: 48h
Times are approximate and at +23oC and 50% r.h. and thus will be affected by changing substrate and ambient conditions, particularly the temperature and relative humidity.
When overcoating SikaLevel-25 Latex Self Levelling always ensure the moisture content has achieved the required value for the coating product, as the waiting time will vary with the application thickness and ambient humidity.
(Refer to the top coat product data sheet)