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Self-Leveling Underlayments

Products

ARDEX LW™

Lightweight, Fast-Setting, Concrete Fill System

  • Combines ARDEX technology with advanced lightweight bead technology
  • Lightweight - 69 to 73 lb. per cubic foot
  • Walk on in 2 - 3 hours
ARDEX K 520 with lightweight beads
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  • ARDEX K 520 with lightweight beads

Information 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

Technical Data ARDEX LW™

Installation

Coverage: A 50 lb. (22.7 kg) bag of ARDEX K 520 mixed at a 1:1 ratio (approx. 5 gallons / 19 L) with beads yields approx. 1 cu. ft. of fill

For “C” size beads: 15 sq. ft. per bag at 3/4″ (1.4 sq. m at 18 mm)
For “B” size beads: 16 sq. ft. per bag at 3/4″ (1.5 sq. m at 18 mm)

Performance

Working Time: 5 – 10 minutes
Initial Set (ASTM C191): Approx. 15 minutes
Final Set (ASTM C191): Approx. 1 hour
Compressive Strength of the finished surface (ASTM C109/mod – Air cure only):
4,500 psi (316 kg/sq. cm) after 28 days if ARDEX V 1200 is used
5,300 psi (371 kg/sq. cm) after 28 days if ARDEX K 13 is used
5,500 psi (386 kg/sq. cm) after 28 days if ARDEX K 15 is used
Warranty: ARDEX L.P. Standard Limited Warranty applies. Also eligible for the ARDEX SystemOne™ Limited Warranty when used in conjunction with select HENRY® Flooring Adhesives.

For complete product technical information, click on the Downloads tab and open the Technical Data download.

Contact Us

Questions? Please fill out the form below to contact us with any of your questions or concerns. We look forward to hearing from you, and we’ll be in touch shortly.

Information 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

Technical Data ARDEX LW™

Installation

Coverage: A 50 lb. (22.7 kg) bag of ARDEX K 520 mixed at a 1:1 ratio (approx. 5 gallons / 19 L) with beads yields approx. 1 cu. ft. of fill

For “C” size beads: 15 sq. ft. per bag at 3/4″ (1.4 sq. m at 18 mm)
For “B” size beads: 16 sq. ft. per bag at 3/4″ (1.5 sq. m at 18 mm)

Performance

Working Time: 5 – 10 minutes
Initial Set (ASTM C191): Approx. 15 minutes
Final Set (ASTM C191): Approx. 1 hour
Compressive Strength of the finished surface (ASTM C109/mod – Air cure only):
4,500 psi (316 kg/sq. cm) after 28 days if ARDEX V 1200 is used
5,300 psi (371 kg/sq. cm) after 28 days if ARDEX K 13 is used
5,500 psi (386 kg/sq. cm) after 28 days if ARDEX K 15 is used
Warranty: ARDEX L.P. Standard Limited Warranty applies. Also eligible for the ARDEX SystemOne™ Limited Warranty when used in conjunction with select HENRY® Flooring Adhesives.

For complete product technical information, click on the Downloads tab and open the Technical Data download.

Contact Us

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