Ardex K15 HB Subfloor Smoothing Compound – 25kg Bag

£30.79 exl. VAT

Per Unit


SKU 131071415091316524 Category

High Build Rapid Drying Subfloor Levelling & Smoothing Compound.

  • Can be applied from 5mm to 35mm in one operation
  • Rapid drying and hardening
  • Can accept foot traffic after just 2 hours, regardless of thickness
  • Ceramic floor tiles can be fixed after just 4 hours
  • High compressive strength
  • Can be hand mixed or pump applied



Ardex K15 HB – Rapid Drying Subfloor Levelling & Smoothing Compound

Ardex K15 HB – Rapid Drying Subfloor Levelling & Smoothing Compound – is an advanced and versatile high build levelling compound designed for applications from 5mm up to a maximum of 35mm. It is virtually tension free and is designed to rapidly level uneven, hard sub-floors. Used in conjunction with either Ardex P82, Ardex P51 or Ardex P4 primers, Ardex K 15-HB can be applied to old sub-floors, e.g. concrete and other hard and rigid bases. ARDEX K 15-HB is a grey powder consisting of special cements, graded aggregates and high quality synthetic resins. When mixed with water, a fluid, pumpable mortar is produced which can be applied to the required thickness in one operation. For thicknesses greater than 20mm it is possible to incorporate larger aggregate in the mixed mortar, thus giving significant cost savings for greater application thicknesses. When applied at 20°C Ardex K 15 HB can normally be walked on after approximately 2 hours. The applied product dries and hardens rapidly so that even thick applications are ready to receive resilient floor finishes such as PVC within 24 hours. Ceramic floor tiles can be installed on top of Ardex K 15-HB as soon as the surface of the Ardex K 15-HB has attained sufficient strength and hardness, typically 4 hours after application at 20°C.


Ardex K15 HB Uses.

ARDEX K 15-HB will level internal sub-floors of concrete, cement/sand, etc. Applications include levelling tamped, uneven, damaged or rained-on in-situ concrete sub-floors, adjusting tolerances or camber problems between floors, slabs or pre-cast concrete as well as pre-levelling old sub-floors and screeds in renovation projects. ARDEX K 15-HB is especially useful where the installation time of the floor finish must be kept to a minimum.


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Additional information

Suitable for Substrates

High Build Rapid Levelling Compound

Minimum Thickness: 5 mm

Maximum Thickness: 35 mm

Compressive Strength @ 28 days: 35N/mm2

Walkable: 2 Hours

Finished Floor Covering After: Ceramic Tiles – 4 Hours, others -24 Hours

Suitable for Substrates: Concrete / Screed



For more than 60 years, ARDEX has been a quality leader for the flooring and tiling industries, the brand of choice for installers and distributors. ARDEX today is still an independent family-owned business. This means that in our permanent efforts to achieve market-shaping innovations, we have been able to retain our most important tradition: uncompromising quality. This is something we guarantee by applying the latest rigidly enforced quality assurance procedures, making it no coincidence that they are regarded as a premium partner of the construction industry. Strong internal growth and intelligent acquisitions in foreign markets have put the Group on the map with 53 subsidiaries and 3,000 employees on all continents. With its 14 major brands, the ARDEX Group generated a worldwide annual turnover in excess of 770 million euros in 2018. This marks an important milestone and they are becoming one of the world’s leading suppliers of high-quality specialist building materials.

Technical Information