Laticrete - NXT Level Flow - Self-Leveling Cement-Based Underlayment Gray - 50 lb

NXT® Level Flow in a 50 lb bag (gray) is the high-flow self-leveling solution from Laticrete's NXT Level product line, designed for projects requiring fast installation and UL-certified fire resistance.

NXT® Level Flow is a fire-rated, high-flowing cement-based self-leveling underlayment designed to level interior floor substrates and allow floor covering installation in just 24 hours. Pumpable or pourable, it can be applied from 3 mm to 51 mm (1/8 in to 2 in) in a single lift and is walkable in 3 to 4 hours. UL-certified, it provides up to 2-hour fire resistance in floor-to-ceiling assemblies (Type LAT, tested to ANSI/UL 263 and ASTM E84). With rapid curing, exceptional durability, and direct adhesive compatibility, it is a high-performance alternative to traditional gypsum underlayments.

Suitable for use over concrete (up to 100% RH per ASTM F2170), gypsum, exterior glue plywood, and other structurally sound substrates, it creates a smooth, level surface for the installation of hardwood, resilient flooring, cork, ceramic tile, natural stone, carpet, and more. Ideal for commercial, institutional, hospitality, healthcare, and residential projects.

Features

• High-flow formula — wide coverage, easy to apply and pump
• Walkable in 3 to 4 hours — floor covering installation in 24 hours
• Thickness: 3 mm to 51 mm (1/8 in to 2 in) in a single lift, tapered to zero at edges
• UL-certified — up to 2-hour fire resistance (ANSI/UL 263 / ASTM E119, ASTM E84)
• Compatible with concrete up to 100% RH (ASTM F2170) — minimal downtime
• Inorganic materials — will not contribute to mold or mildew growth
• High-performance alternative to gypsum underlayments — direct adhesive compatible
• Suitable over concrete, gypsum, and exterior glue plywood