ARDEX

K 15 Premium Self-Leveling Underlayment

Powder (all sizes) · US · not yet reviewed

Check your container: This countdown is for the Powder (all sizes) variant. Similar-looking versions may have different times.

How long before you can tile over ARDEX K 15 Premium Self-Leveling Underlayment?

Short answer

Ready for tile: 6 hours after application.
Ready for floor covering: 16 hours after application.
Floors & flooring adhesive

Return-to-use gates

Open the surface gradually instead of treating cure as one moment

Touch / inspectA surface check only
Foot trafficUse the stated walking time
Heavy useWait for furniture, water or vehicle readiness

Calculate return-to-use time

When was the material placed?
Conditions that affect drying
Where?
Thickness

Stated times

  • Working time ends10 minutes
  • Ready for tile6 hours
  • Ready for floor covering16 hours
  • Light foot traffic2–3 hours

From ARDEX data sheet · checked 2026-10-25. Anything not listed isn’t stated by the manufacturer.

Manufacturer website: ardex.com

Conditions & fine print
  • Stated conditions: 70°F (21°C)
  • Substrate and ambient temperatures must be at least 50°F (10°C) during installation and cure. Forced drying is not recommended because it can dry the surface prematurely. Over in-floor heating, the system must be off 48 hours before, during and at least 48 hours after installation.
  • Temperature range: 50°F to —°F
  • Region US. Formulas can differ between countries; check your container.
  • Working time ends: At 70°F (21°C).
  • Ready for tile: At 70°F (21°C).
  • Ready for floor covering: At 70°F (21°C).
  • Light foot traffic: At 70°F (21°C). Low substrate temperatures or high humidity extend the time.
  • Entered from the manufacturer source; second review pending. Report outdated information
  • Actual results depend on preparation, thickness, ventilation, temperature, humidity, mixing and substrate.

Using this specific product

ARDEX K 15 Premium Self-Leveling Underlayment is listed here as the Powder (all sizes) version for self leveler, underlayment, and tile. For installing or finishing a floor, the useful question is not simply whether the surface looks finished—it is whether the exact next-action milestone shown above has been reached.

Before you start

  • Confirm the package says Powder (all sizes); related versions can use different timing.
  • For self leveler, underlayment, and tile, pay particular attention to subfloor condition, trowel coverage, room temperature and traffic plan.
  • At 70°F (21°C). At 70°F (21°C). Low substrate temperatures or high humidity extend the time.

How to check readiness

Test the least-ventilated area before walking, covering or replacing furniture. Flow time is 10 minutes. Install continuously, because the material sets during placement. Install moisture-insensitive tile and stone after 6 hours. Install all other floor coverings after 16 hours.

Avoid this mistake

Foot traffic, furniture and rugs can have different return times.

Questions

How long before you can tile over this product?

ARDEX states: Flow time is 10 minutes. Install continuously, because the material sets during placement. Conditions: At 70°F (21°C).. Install moisture-insensitive tile and stone after 6 hours. Conditions: At 70°F (21°C).. Install all other floor coverings after 16 hours. Conditions: At 70°F (21°C).. Walkable in 2 to 3 hours. Conditions: At 70°F (21°C). Low substrate temperatures or high humidity extend the time.. These are the manufacturer’s stated times, not a guarantee.

How long before I can install flooring over this product?

ARDEX states: Install all other floor coverings after 16 hours. Conditions: At 70°F (21°C).. These are the manufacturer’s stated times, not a guarantee.

How long do I have to work with this product?

ARDEX states: Flow time is 10 minutes. Install continuously, because the material sets during placement. Conditions: At 70°F (21°C).. These are the manufacturer’s stated times, not a guarantee.

How long before I can walk on tile set with this product?

ARDEX states: Walkable in 2 to 3 hours. Conditions: At 70°F (21°C). Low substrate temperatures or high humidity extend the time.. These are the manufacturer’s stated times, not a guarantee.

What affects how long this product takes to dry or cure?

Substrate and ambient temperatures must be at least 50°F (10°C) during installation and cure. Forced drying is not recommended because it can dry the surface prematurely. Over in-floor heating, the system must be off 48 hours before, during and at least 48 hours after installation. Follow the product label for your conditions.