Planitex SLF is a fiber-reinforced, gypsum-based, self-leveling underlayment with enhanced flexural strength. It resists cracking and provides an exceptionally smooth, hard surface for use in dry, interior residential and commercial areas. Planitex SLF provides an excellent substrate for a wide variety of floor coverings. Planitex SLF can also be used to cover radiant or in-floor heating systems.