Laticrete 4-XLT Rapid Modified Mortar — Fast-Setting Large and Heavy Tile Adhesive
Laticrete 4-XLT Rapid Modified Mortar is engineered for installers who require speed, strength, and versatility in modern tile installations. Its fast-setting formula accelerates project timelines while maintaining exceptional bond strength for large format tile, porcelain, ceramic tile, and stone.
The advanced Water Dispersion Technology platform ensures consistent hydration throughout the mix, allowing installers to achieve the desired mortar consistency without sacrificing performance. Dust Lock Technology reduces dust during handling and mixing, improving jobsite cleanliness and safety.
With superior non-sag properties, this mortar excels in vertical installations and large, heavy tile applications. It also functions effectively as a medium-bed mortar for floors and traditional thin-set installations. The smooth, creamy texture enhances ease of application, while high-performance ratings ensure dependable results in both residential and commercial environments.
Key Features and Benefits
Rapid Setting Performance — Allows grouting in approximately 3–4 hours—ideal for fast-track construction and renovation projects
Excellent Non-Sag Technology — Supports large and heavy tile on vertical surfaces without slipping or sagging
Large and Heavy Tile Capability — Functions as a bonding mortar from 3/32″ up to 3/4″ thickness without shrinkage
Water Dispersion Technology (WDT) — Ensures complete water distribution throughout the mix for consistent application and customizable workability
Dust Lock Technology — Significantly reduces airborne dust and jobsite mess during transport and mixing
Smooth, Creamy Consistency — Improves troweling performance and coverage for professional installation results
High Strength and Heavy-Duty Rating — Rated “Extra Heavy” per ASTM C627 and exceeds ANSI A118.4 and A118.11 requirements
International Performance Classification — Meets ISO 12004 C2FTS2 classification for high-performance adhesive mortars
Suitable Substrates
Exterior Glue Plywood (Interior use only)
Concrete
Concrete Block
Ceramic Tile and Stone
Gypsum Wallboard
Cement Backer Board
Concrete and Brick Masonry
Applications
Large and heavy tile wall installations
Interior and exterior ceramic, porcelain, and stone tile
Medium-bed mortar for floor installations
Thin-set flooring applications
Vertical and non-sag wall installations
Residential and commercial tile projects
Technical Data
Installation:
All surfaces should be between 40°F (4°C) and 90°F (32°C) and structurally sound, clean and free of all dirt, oil, grease, paint, concrete sealers or curing compounds. Rough or uneven concrete surfaces should be made smooth with a Laticrete latex fortified underlayment or leveling mortar to provide a proper finish. Dry, dusty concrete slabs or masonry should be dampened and excess water swept off. Installation may be made on a damp surface. New concrete slabs shall be damp cured and 28 days old before application. All slabs must be plumb and true to within 1/4″ (6 mm) in 10′ (3 m). Expansion joints shall be provided through the tile work from all construction or expansion joints in the substrate. Do not cover expansion joints with mortar.
Approximate Coverage:
Performance:
Open Time: 40 minutes
Pot Life: 30–50 minutes
Time To Grout: 3–4 hours
Time to Heavy Traffic: 5 hours
Shelf Life: 1 year. High humidity will reduce the shelf life of bagged product.
Packaging: 50 lb (22.7 kg) bag.
SKU
L-4XLTR GRAY
UPC
720912027543
Weight (lbs.)
50.0
Non-Returnable
No
Manufacturer
Laticrete
Manufacturer Part Number
0259-0050-21-1
