10 Best Ardex X 5 Flexible of 2025

Tested and Reviewed: Top 10 Ardex X 5 Flexible deals with expert ratings from 8.1 to a perfect 10

March 2026 Edition

Editor's Choice

9.7

Ardex

Ardex X 5 Flexible Tile & Stone Mortar (Gray), 40 lb. Bag

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Editor's bottom line:

“This ardex x 5 flexible is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Ardex X5 is specifically crafted for setting porcelain, quarry, ceramic, and a wide range of natural stone tiles. It provides the highest levels of water and sag resistance with its creamy, easy-to-apply consistency
It can be applied over common interior surfaces, including exterior-grade plywood, and exterior concrete. Ideal for large format and heavy tile and stone applications up to 3/4" sq. notch trowel
Ardex X 5 mortar is designed for indoor and outdoor use. It's perfect for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
Ardex X 5 mortar is designed for indoor and outdoor use. It's perfect for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
It provides a superior non-sag characteristics, exceeding industry standards for installations of large format tiles on walls

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Picked by 397 people today

9.5

Ardex

Ardex X 5 Flexible and Versatile Tile & Stone Thin-set Mortar (White) 40 Lb Bag

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Main Highlights

Ideal for large format and heavy tile and stone applications up to 3/4" sq. notch trowel
Ideal for large format and heavy tile and stone applications up to 3/4" sq. notch trowel
Ideal for large format and heavy tile and stone applications up to 3/4" sq. notch trowel
Excellent sag resistance
Use for setting porcelain, quarry, ceramic and most natural stone tiles

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9.5

Ardex

Ardex X 90 Outdoor Microtec, Rapid-set, Cement-based Flexible Thinset Mortar, 40 Lb (18 Kg) Bag, Freeze and Thaw Resistant Flooring Underlayment for Stone, Ceramic Tile for Exterior Applications, Gray

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Main Highlights

Ardex X 90 is crafted with high-performance cements, polymers, and microfibers. It safeguards against the harshest weather conditions and provides the highest levels of efflorescence resistance with its creamy, easy-to-apply consistency
This thinset mortar can be installed over substrates with temperatures as low as 40 F (5 C) and withstands driving rains. It exceeds industry standards for installations of large format tiles over uncoupling membrane and waterproofing membrane
Ardex polymer modified mortar features the highest level of freeze or thaw resistance and weatherproof technology. It is thin to medium bed installations up to 5/8 (15 mm)
Ardex X 90 mortar for indoor and outdoor use is ideal for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
This thinset mortar provides excellent bond strength for setting various floor tile and wall tile, such as porcelain tile, mosaic tile, marble tile, ceramic tile, and natural stone tile

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9.2

Ardex

Ardex X 90 Outdoor Microtec, Rapid-Set, Cement-Based Flexible Thinset Mortar, 40 Lb (18 Kg) Bag, Freeze Thaw Resistant Flooring Underlayment for Stone, Ceramic Tile, for Exterior Applications, White

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Main Highlights

Ardex X 90 is crafted with high-performance cements, polymers, and microfibers. It safeguards against the harshest weather conditions and provides the highest levels of efflorescence resistance with its creamy, easy-to-apply consistency
This thinset mortar can be installed over substrates with temperatures as low as 40 F (5 C) and withstands driving rains. It exceeds industry standards for installations of large format tiles over uncoupling membrane and waterproofing membrane
Ardex polymer modified mortar features the highest level of freeze or thaw resistance and weatherproof technology. It is thin to medium bed installations up to 5/8 (15 mm)
Ardex X 90 mortar for indoor and outdoor use is ideal for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
This thinset mortar provides excellent bond strength for setting various floor tile and wall tile, such as porcelain tile, mosaic tile, marble tile, ceramic tile, and natural stone tile

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9.0

Ardex X 4 G Thinset Mortar - 40lb Grey

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Main Highlights

Interior and exterior use
Working time: 15 to 20 minutes
Open time: 10 to 15 minutes; Pot life: 3 hours
40lb. (18 kg) bags, Gray and White
Coverage: 80 sq.ft. (7.4 m²)

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8.8

Ardex

Ardex S 1-K, Single-Component, Flexible, Waterproofing and Crack Isolation, Premixed, Load-Bearing, Liquid Membrane, Compound for Interior Floors and Walls, Flooring Underlayment, 3.5 Gal Pail

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Main Highlights

ARDEX S 1-K is a Single-component Waterproofing Compound that creates a flexible coating, providing reliable protection for various interior building surfaces vulnerable to water exposure
This membrane serves as an excellent bonding layer for tile and stone setting materials, enhancing the overall performance and longevity of bathrooms, showers, and other wet areas before the installation of tile
The versatility of the Ardex S 1-K extends to the isolation of cracks, providing protection for substrates up to 1/8 inch (3 mm). This prevents the propagation of cracks and ensures long-term structural integrity.
This isolation membrane is super easy to use. It's so smooth and consistent, it makes applying it a breeze. There's no dripping or splattering, so you get a really clean finish.
Ardex S 1-K exhibits exceptional bonding characteristics, effectively adhering to a wide variety of substrates, providing reliable performance in various installation situations

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8.6

Ardex

Ardex S 1-K, Single-Component, Flexible, Waterproofing and Crack Isolation, Premixed, Load-Bearing, Liquid Membrane, Compound for Interior Floors and Walls, Flooring Underlayment,1 Gal

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Main Highlights

ARDEX S 1-K is a Single-component Waterproofing Compound that creates a flexible coating, providing reliable protection for various interior building surfaces vulnerable to water exposure
This membrane serves as an excellent bonding layer for tile and stone setting materials, enhancing the overall performance and longevity of bathrooms, showers, and other wet areas before the installation of tile
The versatility of the Ardex S 1-K extends to the isolation of cracks, providing protection for substrates up to 1/8 inch (3 mm). This prevents the propagation of cracks and ensures long-term structural integrity.
This isolation membrane is super easy to use. It's so smooth and consistent, it makes applying it a breeze. There's no dripping or splattering, so you get a really clean finish
Ardex S 1-K exhibits exceptional bonding characteristics, effectively adhering to a wide variety of substrates, providing reliable performance in various installation situations

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8.3

Ardex

Ardex SK Mesh 25 - Reinforcement Fabric for Waterproofing & Crack Isolation - 4.75" W x 81.75' L

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Main Highlights

Ardex SK Mesh 25 roll measures 4.75" x 81.75'
Premium, non-woven, polyester mesh reinforcement fabric
Used for reinforcing waterproofing & crack isolation
Use with Ardex 8+9 (sold separately)
Price listed is per roll

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Our Best Overall Choice

Best Choice

9.7

Ardex

Ardex X 5 Flexible Tile & Stone Mortar (Gray), 40 lb. Bag

Free Shipping

Editor's bottom line:

“This is the best one we tested. In terms of quality, brand and price, we couldn't ask for more.”

Main Highlights

Ardex X5 is specifically crafted for setting porcelain, quarry, ceramic, and a wide range of natural stone tiles. It provides the highest levels of water and sag resistance with its creamy, easy-to-apply consistency
It can be applied over common interior surfaces, including exterior-grade plywood, and exterior concrete. Ideal for large format and heavy tile and stone applications up to 3/4" sq. notch trowel
Ardex X 5 mortar is designed for indoor and outdoor use. It's perfect for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
Ardex X 5 mortar is designed for indoor and outdoor use. It's perfect for exterior or interior floors, walls on concrete balconies, patios, swimming pools, and high-load commercial areas
It provides a superior non-sag characteristics, exceeding industry standards for installations of large format tiles on walls

Show Price

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