Ardex - A55 (22kg) Ultra Rapid Hardening and Drying Smoothing and Levelling Compound

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In stock
Ardex - A55 (22kg)
  • 10 items +    £38.29
  • 25 items +    £37.09
  • 50 items +    £32.29
  • Available for Next Day Delivery
  • FREE Delivery when you spend over £125

Ardex - A55 (22kg) Ultra Rapid Hardening and Drying Smoothing and Levelling Compound

ARDEX A55 is an advanced sub-floor smoothing and patching compound with rapid hardening and rapid drying properties, specifically designed for areas where the installation time of floor finishes must be kept to a minimum. 

When mixed with water, an exceptionally fluid, flexible self-levelling mortar is produced which can be applied from a feather edge up to the required thickness in a single operation.

Dependent on substrate and application thickness, ARDEX A55 can normally be walked on after approximately 60 minutes at 20O C. ARDEX A55 dries and hardens rapidly by hydration, binding in the mix water so that, providing the ARDEX A55 layer has hardened sufficiently and the adhesive trowel does not damage the mortar surface, the floorcovering may be installed, even if the surface appears to be damp, typically after 60 minutes at 20OC.

Technical Information:

  • Appearance: Polyethylene Lined Paper Sack
  • Bulk density of powder: approx. 1.2kg/litre
  • Weight of fresh mortar approx. 1.85kg/litre
  • Working time (20OC): approx. 15 minutes
  • Walkability (20OC): approx. 60 minutes
  • Ready to receive floorcoverings (20OC): approx. 60 minutes
    *dependant on substrate, application thickness and temperature.


Approximately 1.47kg of powder per square metre per millimetre of thickness, i.e. one bag will cover approximately 7.5m2 at 2mm thick. Note: Coverage rates will depend on the condition and absorbency of the subfloor


Pour the mixed ARDEX A55 onto the prepared sub-floor. The mixed mortar will flow out to provide a flat surface within the 15 minute working time. A steel finishing float is recommended to produce the required finish, or alternatively a long-handled smoothing trowel and/or a spiked roller can be used for finishing off. Apply at temperatures above 5OC.


ARDEX A55 can be applied from a feather edge up to 10mm neat; its optimum flow properties are found in applications of 2mm or above. When applying ARDEX A55 at thicknesses over 10mm, incorporate up to an equal volume of 3mm single sized chippings e.g. ARDEX COARSE AGGREGATE. Mix the ARDEX A55 as above and add the aggregate without further addition of water.

NOTE: Non-absorbent sub-floors must be levelled with at least 1.5mm of ARDEX A 55. Flooring grade asphalt must be levelled with at least 3mm of ARDITEX NA, but not exceeding 6mm in thickness.


ARDEX A55 is considered non-hazardous in normal usage. The presence of cement in the product gives an alkaline mortar which may cause some local irritation if prolonged contact with the skin takes place. Care should be taken to avoid inhalation or ingestion and prevent contact with the eyes.

Storage and Shelf Life:

ARDEX A55 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 6 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