Rapid-set, flexible tile and stone mortar designed for extreme outdoor conditions. Offers superior freeze-thaw and efflorescence resistance, fast-setting even at low temperatures, and is ideal for exterior floors, walls, patios, balconies, pools, and commercial areas.
Ardex X 90 OUTDOOR Tile and Stone Mortar — Freeze-Thaw? No Problem
Ardex X 90 OUTDOOR is a high-performance mortar engineered for the harshest weather conditions. Formulated with specialty cements, polymers, and microfibers, it provides maximum freeze-thaw resistance (tested at 150+ cycles, far exceeding ANSI 118.15 standards) and excellent efflorescence protection.
This mortar sets rapidly even at temperatures as low as 40°F (5°C), and surfaces can withstand heavy rain or be grouted after just 2 hours. Its creamy, easy-to-apply consistency, extended open time, and strong adhesion make it perfect for porcelain, glass, ceramic, and most natural stone tiles. Ideal for exterior and interior floors and walls, including high-load commercial areas, swimming pools, patios, and balconies.
Key Features
Highest levels of freeze-thaw resistance – tested at 150+ cycles (7x ANSI standard)
Maximum efflorescence resistance
Outstanding rapid-setting properties, even at 40°F / 5°C
Heavy and driving rain-resistant after only 2 hours
Suitable for concrete balconies, patios, swimming pools, and high-load commercial areas
Traffic and grout after just 2 hours
Thin to medium bed installations up to 5/8" (15 mm)
Extended open time up to 30 minutes
Excellent bond strength for porcelain, glass, ceramic, and most natural stone tiles
Mixing Ratio: 5.75 – 6.75 quarts (5.4 – 6.4 L) of water per 40 lbs. (18 kg) bag
(For smaller batches, use 2.5 parts powder to 1 part water by volume)
Approximate Coverage:
1/4" x 1/4" Sq. Notch trowel; 95 sq. ft. (8.8 sq. m)
1/4" x 3/8" x 1/4" Sq. Notch trowel; 75 sq. ft. (7 sq. m)
1/2" x 1/2" Sq. Notch trowel; 55 sq. ft. (5 sq. m)
Performance:
Open Time: Up to 30 minutes
Pot Life: Approx. 1 hour
Adjustment Time: Approx. 15 – 20 minutes
Time to Grout: 2 hours
Colors: Gray, White
VOC: 0
Packaging: 40 lb. (18 kg) bag
Storage: Store in a cool, dry area. Do not leave bags exposed to sun.
Shelf Life: 1 year, if unopened
Warranty: Ardex L.P. Standard Limited Warranty applies