Description
Ardex K40 HB Levelling Compound is a fibre reinforced, high build levelling and smoothing compound designed for applications from 3mm up to a maximum of 40mm.
Ardex K40 HB hardens rapidly and can normally be walked on in as little as 2 hours. Applications up to 5mm can receive resilient floorcoverings, including timber, after 6 hours, and thicker applications up to 40mm after 48 hours. Ceramic floor tiles can be fixed as soon as the surface has attained sufficient strength and hardness, typically 2 hours after application.
Ardex K40 HB Fibre Reinforced Levelling Compound comes in 22kg bags.
ARDEX K40 HB 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. Other applications include levelling uneven, damaged or rain damaged in-situ concrete subfloors, and adjusting tolerances or camber problems between floors, slabs, or pre-cast concrete.
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 use.
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 1 C, Ardex DPM 1 C R or Ardex MVS 95 datasheet for further information.
Priming:
All surfaces must be primed to maximise the working time, maintain the flow life, and prevent air bubbles rising through the levelling compound.
- Concrete, cement/sand screeds: 1-part Ardex P51 Primer to 2 parts water. water
- Gypsum subfloors: 1-part Ardex P51 Primer to 2 parts (Please check the screed manufacturers recommendations before commencing work) .
- Timber: Ardex P51 Primer neat and allowed to dry between 1 and 12hrs dependent on porosity of timber.
- NOTE: Ardex K40 HB can be applied at a maximum thickness of 6mm over Gypsum subfloors.
- NOTE: Impregnated boards should not be used as they 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.
Ardex P4 Primer and Ardex P82 Primer are both recommended for use on Ardex DPM’s for smoothing applications of between 3mm to 6mm in thickness, and on nonabsorbent subfloors when Ardex K40 HB is applied up to 10mm in depth e.g. power floated concrete, smooth pre-cast concrete and sound terrazzo, porcelain/ceramic/quarry tiles or natural stone. For thicknesses that exceed the above recommendations use Ardex R3E Primer blinded with Ardex Fine Aggregate as the primer coat. When applying over flooring grade asphalt, the surface must be sound, cleaned with a suitable neutral cleaner, primed with Ardex P82 Primer and applied between 3-5mm thick.
Mixing:
Use between 3½ and 3¾ litres of water per 22kg bag. Add the Ardex K40 HB 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. Use the minimum amount of water content for thick applications or cold conditions.
Application:
Apply Ardex K40 HB at temperatures above 5°C. Pour the mixed Ardex K40 HB onto the prepared subfloor and use a pin steel finishing trowel or float to spread and finish off. The extended workable wet edge time of 35 minutes means that fresh applications of material can be easily trowelled into existing pre-applied material up to 35 minutes after application. It is important to protect the freshly applied material from direct sunlight or draughts as this may cause premature drying.
Applications over underfloor heating: Heated screeds must be laid in accordance with BS 8204 Part 1 and BS EN 1264.The underfloor heating system should have been commissioned in accordance with the manufacturer’s instruction manual and BS 8204 Part 1 and BS EN 1264-4.
Once commissioned and thermally cycled, the underfloor heating system should be turned down to room temperature, but not below 15°C, before the installation of Ardex K40 HB and the floorcovering. The underfloor heating system should then be gradually brought up to normal operating temperature to avoid rapid thermal shock and wide temperature variations. Ardex K40 HB can also be used to encapsulate under-tile heating cables/mats onto prepared concrete, screeds, and tile backing boards prior to fixing ceramic tiles. For information on suitable UFH heating systems please contact our Technical Support Team.
Pumping:
Ardex K40 HB may be pumped using a suitable floor screed mixer pump units. For advice on pumping, including suitable equipment and techniques, please contact our Technical Support Department.
Coverage:
A 22kg bag of Ardex K40 HB will cover approximately 4m² at 3mm thick. The coverage figure is based on a flat level surface, and additional material should be allowed for where the surface is rough or uneven.
Technical Data:
Bulk density of powder: approx. 1.45kg/litre
Weight of fresh mortar: approx. 2.2kg/litre
Working time at 20°C: approx. 30 minutes
Flow life at 20°C approx. 25 minutes
Click here to view this product on the manufacturers website.
Reviews
There are no reviews yet