ARDEX K 15 Rapid Drying Heavy Duty Self-Levelling Smoothing Compound

K 15 is a rapid drying self-levelling sub-floor smoothing compound.


  • Improved yield and superior flow and levelling characteristics.
  • Rapid hardening - walk on after 2 hours.
  • Receives floorcoverings the next day, regardless of thickness at 20°C.
  • Apply from feather edge up to 35 mm thick.
  • Can be applied by trowel or pump.
  • Strong - high compressive strength.
  • Suitable for floors with underfloor heating.
  • Ideal for use with ARDEX flooring adhesives.


May generally be applied to any thickness, but non-absorbent sub-floors, e.g. flooring grade asphalt, must be levelled with at least 1.5 mm of ARDEX K15. No more than 6 mm of ARDEX K 15 should be used on top of asphalt.

  • Limitations: ARDEX K 15 is limited to 10 mm thick on ARDEX P 82 primer. This is reduced to 6 mm on ARDEX P 82 when onto ARDEX DPM/ ARDEX DPM 1C/ ARDEX DPM 1CR.

General information




Special cements, graded aggregates and high quality synthetic resins

Uniclass 2015

Pr_35_31_06_80 Smoothing and levelling underlay compoundsPrimary


M10/160 Proprietary self smoothing levelling screeds

M40/460 Smoothing underlayment

M50/460 Smoothing/ levelling underlayment compound

M50/65 Laying coverings

Specification data - Smoothing and levelling underlay compounds

Product Reference

ARDEX K 15 Rapid Drying Self-Levelling Sub-Floor Smoothing Compound


Not required

P51 primer

P82 primer

P4 primer

Contractor's choice

Smoothing compound


Aggregate filler


3 mm ARDEX COARSE Aggregate

3 mm single sized chippings

3–8 mm chippings

Contractor's choice

Amount (by volume)


Not more than volume of ARDEX K15 compound

Product Options


All surfaces must be primed.

– ARDEX P51:

  • Aqueous synthetic based dispersion primer and bonding agent used to prepare internal surfaces to receive cement-based levelling compounds, adhesives or screeds. Use ARDEX P51 on very absorbent surfaces.

– ARDEX P82:

  • Two-part water based synthetic dispersion primer and bonding agent used to form a priming/ bonding layer on most substrates, particularly smooth or dense surfaces, e.g. smooth power floated concrete including ARDEX DPM/ ARDEX DPM 1C/ ARDEX DPM 1CR.
  • ARDEX P4 - Solvent free rapid drying primer, applied to concrete, screeds, terrazzo and ceramic tiles and can be used externally.

Aggregate filler:

For thicknesses over 10 mm incorporate up to an equal volume of 3 mm single sized chippings. For thicknesses of 20–35 mm up to an equal volume of 3–8 mm aggregate may be added.

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