Ardex - K40 HB (22kg) Rapid Drying, High Build, Fibre Reinforced Levelling and Smoothing Compound

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In stock
Ardex - K40 HB (22kg)
  • 10 items +    £24.64
  • 25 items +    £23.44
  • 50 items +    £18.64
  • Available for Next Day Delivery
  • FREE Delivery when you spend over £125

Ardex - K40 HB (22kg) Rapid Drying, High Build, Fibre Reinforced Levelling and Smoothing Compound

ARDEX K40 HB is a fibre reinforced, high build levelling and smoothing compound designed for applications from 3mm up to a maximum of 40mm. ARDEX K 40 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 K 40 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.

Technical Information:

  • Appearance: Polyethylene Lined Paper Sack - 22kg
  • Bulk density of powder approx.1.45kg/litre
  • Weight of fresh mortar approx. 2.2kg/litre
  • Working time at 20oC approx. 30 minutes
  • Flow life at 20oC approx. 25 minutes
  • Apply from 3mm to 40mm
  • Fibre Reinforced for strength and flexibility
  • Walkable in approximately 2 hours, regardless of thickness
  • Install resilient and timber floorcoverings in as little as 6 hours
  • Fix tiles after 2 hours
  • Extended 35-minute working time


A 22kg bag of ARDEX K 40 HB will cover approximately 4m² at 3mm thick.
Note:  The coverage figure is based on a flat level surface, and additional material should be allowed for where the surface is rough or uneven.


Apply at temperatures above 5°C. Pour the mixed ARDEX K 40 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.

Immediately smooth the material with the ARDEX T-5 Smoother, or spike roll the material with the ARDEX T-6 Spiked Roller. Work in a continuous manner during the entire self-levelling installation. Wear cleated athletic shoes with non-metallic spikes to avoid leaving marks in the liquid. 

Storage and Shelf Life:

ARDEX K 40 HB must be stored in unopened packaging, clear of the ground in cool dry conditions and be protected from excessive draught.
If stored correctly, as detailed above, the shelf life of this product is 12 months from the date shown on the packaging.

Delivery Information

We aim to dispatch all orders within 2 working day of receipt. Occasionally public holidays, weekends, weather events, or extremely busy periods may result in extended delivery times. In these circumstances, we will endeavour to communicate with you about the delay and resolve and resulting issues.

Please note that we do not make delivery date promises, however:

- Orders placed before 1pm on a weekday will be processed the same day.

- Orders placed after 1pm on a weekday will be processed the following morning. 

- Orders placed after 1pm on Thursday will be processed and dispatched the following day and out for delivery the following Monday (if Next Day Delivery is selected).

- Orders placed after 1pm on Fridays will be processed and dispatched on the following Monday.

For more information about our Shipping & Delivery services click HERE

UK Mainland Delivery Options:


Free Delivery: Applicable for orders of £125 excl. VAT and above
(Monday – Friday, excluding public holidays)


Collect From Store: 41 Markfield Road, London N15 4QA
(Monday – Friday, 9am–5pm excluding public holidays)


Standard Delivery: 3-5 Working Days
(Monday – Friday, excluding public holidays)


Express Delivery: Next Working Day
(Monday – Friday, excluding public holidays)

Out Of Zone Delivery Surcharges:

Isle of Wight

£12.50 per item (3-5 Working Days)

Isles of Scilly

£12.50 per item (3-5 Working Days)

Northern Ireland

£25.00 per item (3-5 Working Days)

Western Isles

£25.00 per item (3-5 Working Days)

Shetland Isles

£30.00 per item (3-5 Working Days)


£30.00 per item (3-5 Working Days)

Isle Of Man

£30.00 per item (3-5 Working Days)

Channel Islands

£30.00 per item

Republic of Ireland

Not Available