Mapei Keraflex Plus Extra Smooth Large & Heavy Tile Mortar

Mapei Keraflex Plus Extra Smooth is a premium polymer-modified thin-set mortar engineered for large and heavy tile (LHT) installations. Designed for professional contractors and serious DIY users, this high-performance grey mortar provides superior adhesion, stability, and workability for floor, wall, and countertop tile projects. Its advanced non-sag, non-slump formula ensures tiles remain firmly in place during installation, making it ideal for vertical applications and large-format porcelain or natural stone tiles.

Formulated with MAPEI’s Easy Glide Technology™, Mapei Keraflex Plus Extra Smooth 44 lb offers a creamy, extra-smooth consistency that makes mixing, spreading, and troweling significantly easier. This reduces installer fatigue while improving coverage and tile positioning accuracy. Whether you're installing oversized porcelain tiles, heavy natural stone, or thick ceramic materials, this mortar delivers reliable bond strength and long-term durability.

Designed for Large and Heavy Tile Applications

Unlike standard thin-set mortars, Mapei Keraflex Plus Extra Smooth 44 lb is specifically engineered to support large-format and heavy tile installations without slumping. It allows bond coats up to 1/2" (12 mm) in thickness, making it suitable for uneven substrates and edge-leveling adjustments. The non-sag performance helps maintain alignment on walls, while the non-slump formula prevents tiles from sinking on floors.

This makes it an excellent solution for:

• Large-format porcelain tiles

• Heavy natural stone slabs

• Ceramic and quarry tile

• Interior and exterior installations

• Residential and commercial flooring

Versatile Substrate Compatibility

Mapei Keraflex Plus Extra Smooth 44 lb is compatible with a wide variety of approved substrates. It performs exceptionally well over plywood (interior floors), uncoupling membranes, crack-isolation membranes, waterproofing membranes, and sound-reduction systems. This versatility makes it a dependable choice for bathrooms, kitchens, commercial spaces, patios, and renovation projects where substrate conditions vary.

The polymer-enriched formula enhances flexibility and bond strength, reducing the risk of tile failure over time. When properly installed, this mortar ensures a secure, long-lasting installation even in high-traffic environments.

Easy Application & Professional Results

One of the standout advantages of Mapei Keraflex Plus Extra Smooth 44 lb is its improved workability. The smooth texture allows for effortless troweling and better mortar transfer to the tile back. This improves adhesion and reduces the likelihood of hollow spots beneath large-format tiles.

For best results:

• Ensure the substrate is clean, dry, and structurally sound

• Use the appropriate trowel size for tile dimensions

• Achieve full mortar coverage by properly embedding tiles

• Allow adequate curing time before grouting

Edge-leveling systems can also be used with this mortar to achieve perfectly aligned surfaces, especially when installing large-format tiles.

Why Choose Mapei Keraflex Plus Extra Smooth 44 lb?

Choosing the right mortar is critical for long-term tile performance. Mapei Keraflex Plus Extra Smooth 44 lb combines strength, flexibility, and ease of use into one professional-grade solution. Its ability to handle heavy tile loads without sagging or slumping makes it a top choice for demanding installations.

Whether you're completing a residential renovation or managing a commercial construction project, this large and heavy tile mortar provides the confidence, reliability, and efficiency required for superior results.