Duromastic ACS

Price: $110.50 (Inc. GST and Freight)

Duromastic ACS is the Number 1 flexible acrylic polymer membrane for waterproofing under tiled balconies, showers and bathrooms.

Suitable for use on most common lining materials and cures to form a seamless and lap free membrane.

Duromastic ACS  cures to form a seamless and lap-free membrane over the substrate which will not re-emulsify under constant immersion when fully cured.

 Duromastic ACS is a liquid applied membrane which when reinforced and fully cured forms a flexible waterproofing lining for showers and other wet areas as described in NZ Standard E3 AS/1 and Australian Standard AS3740-2010 “Waterproofing wet areas within residential buildings”.

Download Spec Sheet

  • Waterbased and non-toxic
  • Single pack, simple to apply by brush or roller
  • Withstands constant water immersion
  • Fast drying
  • Retains flexibility
  • ABSAC approved
  • Compatible with most common tile adhesives


  • Showers
  • Bathrooms
  • Balconies
  • Ablution areas
  • Other tiled wet areas


Reinforce using Chopped Strand fibreglass mat or Sontara polyester cloth. (See under waterproofing).

Typical coverage is 1.5litres/ sqm to allow for a base coat, fibreglass saturation and heavy top coats.

  • Pale blue