Description
Ardex K40 FLOW Levelling Compound is an advanced, high-performance levelling and smoothing compound with market leading extended wet edge and walkability time. The rapid hardening properties of Ardex K40 FLOW mean that it is walkable in as little as 2 hours, and applications of up to 5mm can receive floorcoverings, including timber after 6 hours. It is supplied in a 22kg bag.
Ardex K40 FLOW Levelling Compound will level and smooth, in a single application, most new and existing internal subfloors including concrete, cement/sand screeds, anhydrite screeds, stone, terrazzo and ceramic tiles, and suitable timber floors.
Substrate Preparation:
The surface of the subfloor must be clean, sound, and free from dust, plaster droppings, grease, polish and any water softenable or loosely adhered materials. In all cases where traces of adhesive residues are present, these must be sound, hard, well adhered, and unaffected by water. Use a suitable degreaser to remove polish, wax, grease, oil, and similar contaminating substances prior to using Ardex K40 FLOW Levelling Compound.
Direct to earth subfloors must contain an effective damp proof membrane. If the DPM is absent or damaged, or the substrate is damp, consult the Ardex DPM 1C, Ardex DPM 1CR or Ardex MVS95 datasheet for further information.
Priming:
All surfaces must be primed prior to using Ardex K40 FLOW, in order to maximise the working time, maintain the flow life, and prevent air bubbles rising through the levelling compound.
Cement/sand or gypsum screeds (please check the screed manufacturers recommendations before commencing work): 1-part Ardex P51 Primer to 3 parts water.
Concrete subfloors: 1-part Ardex P51 Primer to 2 parts water.
Timber: Ardex P51 Primer neat and allowed to dry NOTE: Ardex K40 FLOW can be applied at a maximum thickness of 6mm over Gypsum or timber subfloors. NB: No impregnated boards should be used as this will prevent the primer from penetrating.
For further information please refer to the Ardex P51 datasheet. Ardex P4 Primer is recommended for use on very smooth, dense, and non-absorbent subfloors e.g. Ardex Damp Proof Membranes and smooth power floated concrete.
Mixing:
Use between 5¼ and 5½ litres of water per 22kg bag of Ardex K40 FLOW Levelling Compound. For applications below 6mm we recommend using the maximum water content. Add the powder to the required amount of clean water in a clean mixing container whilst stirring thoroughly until a lump free mortar is produced. The use of an Ardex mixing paddle with a 10mm chuck slow speed (600-1000 rpm) electric drill makes light work of mixing.
Application:
Pour the mixed Ardex K40 FLOW mortar onto the prepared subfloor and use a steel finishing trowel or float to spread the mortar and finish off. The excellent workability of Ardex K40 FLOW Levelling Compound means that fresh mixes of material can be easily trowelled into existing pre-applied material up to 30 minutes after application.
Where levelling large surface areas it may be advantageous to pump Ardex K40 FLOW. In domestic and light duty installations all chipboard must conform to the latest BS EN 312 standard and be of a suitable flooring grade.
The superior smoothing and levelling properties of Ardex K40 FLOW help to ensure the best possible finish with minimum effort. Spike rollers may be used if preferred, but their use is not essential as an excellent finish is normally achieved with a gauging tool or a trowel depending on the depth of the application. Apply at temperatures above 5°C. Lower temperatures will extend the working time, higher temperatures will shorten the working time.
Drying & Hardening:
Ardex K40 FLOW is walkable after 2 hours and layers up to 5mm are ready to receive floorcoverings after as little as 6 hours at 20°C. Layers up to 10mm thick are dry after approximately 12 hours. Applications from 10 – 20mm require approximately 24 hours to dry, depending on site conditions. Ceramic tiles and non-moisture sensitive natural stone can be installed as soon as Ardex K40 FLOW is walkable, typically for moisture sensitive natural stone installations allow at least 24 hours before laying.
Where the applied mortar is subjected to rapid drying conditions, or where the installation of the floorcovering is delayed for longer than 48 hours, the surface should be covered to provide temporary protection against surface damage and contamination.
Coverage:
When applied at 3mm thickness a 22kg bag of Ardex K40 FLOW will give approximately 5m² per bag which is comparable to typical competitor products supplied in 25kg bags which claim 5m² per 25kg unit at 3mm.
NOTE: The coverage figure is based on a flat level surface. Additional material may be required where the surface is rough or uneven.
Technical Data:
Bulk density of powder approx.: 1.2kg/litre
Weight of fresh mortar approx.: 1.9kg/litre
Working time at 20°C approx. 30 minutes
Flow life at 20°C approx. 25 minutes
Compressive Strength: After 1 day 9.0 N/mm2, After 7 days 29.0 N/mm2, After 28 days 37.0 N/mm2
Tensile Bending Strength: After 1 day 2.5 N/mm2, After 7 days 6.0 N/mm2, After 28 days 9.5 N/mm2
EMICODE: EC1+R (very low emission)
Suitable for under floor heating: Yes
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