ARDEX LW™

Choose Lightweight

The ARDEX LW™ System is a lightweight fill system for existing, indoor concrete slabs where the addition of dead load to the structure is a concern. It combines ARDEX technology with the addition of lightweight synthetic particles to create a deep fill that can be applied from a minimum of 3/4″ up to any thickness. This is followed by a 1/4″ coat of an ARDEX Self-Leveling Underlayment to create the ideal surface for the finished flooring installation.

Per inch of thickness, standard concrete adds 12 – 13 lb. of dead load per sq. ft. (58 – 63 kg / sq. m at 2.5 cm), while gypsum fills and Portland cement-based underlayments add 9 – 10 lb. / sq. ft. (44 – 49 kg / sq. m). Other traditional lightweight fill materials have substantially lower densities, but lack the integrity to serve as the substrate for a leveling course. Per inch of thickness, the ARDEX LW deep fill layer adds only 6.08 lb. / sq. ft. (29.7 kg / sq. m at 2.5 cm), and it dries and hardens quickly enough to allow the installation of the ARDEX Self-Leveling Underlayment layer after just one day.

Key Features

• Install the deep fill layer from a minimum of 3/4″ up to any thickness
• Fast track – smoothing course applied after 16 hours
• Combines ARDEX technology with advanced lightweight bead technology
• Interior applications only

System Components

Deep Fill Layer

• ARDEX P 51™ Primer
• ARDEX K 520™ Self-Leveling Concrete Topping
• “C” (avg. 2 mm) or “B” (avg 3 mm) size beads (approx. 5 gal. / 19 L per bag of ARDEX K 520)

Self-Leveling Underlayment Layer

• ARDEX P 51 Primer and one of the following:
  • ARDEX K 15^® Premium Self-Leveling Underlayment
  • ARDEX K 13™ Premium Self-Leveling Underlayment
  • ARDEX V 1200™ Self-Leveling Underlayment