Tile & Stone Installation

Premium Sanded Thin-Set Mortar

SGM Premium Sanded Thin-Set Mortar is a superior dry-set mortar formulated with supreme working characteristics like open time, pot life, and coverage. This product can be used for demanding installations of ceramic, mosaic, quarry, and dimension stone (absorptive, semi-vitreous, and vitreous) tile. Ideal for use in hot and dry climates.

Meets ANSI 118.4.

Product Details



  • Concrete and plaster surfaces: All floors should be 28 days cured and shall be structurally sound, clean, and free of any moisture, wax, oil, paint particles, curing agents, or foreign matter. The slab should have a steel trowel or broom swept finish. Remove any liquid curing agents or concrete sealers, followed by a clear water wash. Surfaces may be cleaned with sulfamic acid (SGM Safe Clean Crystals) then thoroughly flushed and neutralized. The concrete shall be free of any efflorescence and hydrostatic pressure. Test to confirm that the concrete can absorb water by sprinkling water droplets. If the water beads up and does not absorb into the substrate, scarify surface via mechanical abrasion with a Carborundum disk followed by a clear water wash. Test again to ensure that the water is absorbed into the substrate before proceeding with the installation. Smooth concrete should also be roughened to ensure a mechanical bond. For hot and dry conditions, lightly dampen the surface with water, leaving no water puddles.
  • Plywood and Wooden Substrates: All plywood floors (including subfloors) shall be engineered to meet all ANSI requirements. All plywood shall be an exterior grade (for interior, residential, and light commercial use in dry areas only), free of dust, oil, or other foreign matter. Mortar shall be mixed with SGM Southcrete™ 25 Acrylic or SGM Southcrete™ 28 Flexible Additive in lieu of mixing water when installing tiles over these substrates.
  • Alternate Surfaces: To bond over existing ceramic tile, marble, vinyl, VCT, and resilient flooring, floors must be bonded well to its subfloor and free of any wax, oil, dust, or paint particles. For use over existing ceramic tile, scarify surface of the tile via mechanical abrasion with a Carborundum disk followed by a clear water wash. Do not use over wood, vinyl, particleboard, luan plywood, gypsum-based underlayments, wall coverings, adhesive residue, masonite, metal, glass, plastic, or painted surfaces. Surfaces such as these will prevent bonding and should be covered with a cleavage membrane topped with a ?” to ¾” (9.5 to 19.1 mm) reinforced mortar bed for floors. Wait a minimum of 20 hours before dry-set mortar may be applied to the mortar bed. Not recommended for setting green or black marble, vitreous, or impervious tile (i.e. porcelain tile). Use SGM Southcrete 25 Acrylic or SGM Southcrete 28 Flexible Additive in lieu of mixing water when installing a vitreous or impervious (porcelain) tile. The green and black moisture-sensitive marbles must be set with SGM EGS Epoxy Mortar. Consult SGM technical service department for product and installation recommendations.
  • Expansion Joints: Do not tile over expansion, cold, or control joints. Follow Tile Council of North America (TCNA) Handbook 2019, Method EJ 171 for detailed specifications.


Product is alkaline on contact with water. Use paddle for mixing to avoid splashing into eyes or contact with skin. During mixing or application avoid contact with eyes. In case of such contact, flood eyes repeatedly with water and CALL A PHYSICIAN. Wash thoroughly after handling and before smoking or eating. Do not take internally. CONTAINS FREE SILICA — DO NOT BREATHE DUST. Prolonged exposure to dust may cause delayed lung disease (Silicosis).

WARNING: This product may expose you to chemicals, including silica, which the State of California recognizes as a cause of cancer. For more information, visit the Proposition 65 Warnings Website (www.P65Warnings.ca.gov). Use NIOSH approved masks at all times to handle silica dust. KEEP OUT OF REACH OF CHILDREN.


Add Premium thin-set mortar powder to approximately 1½ gallons (5.7 L) cool, clean, potable water, Southcrete 25 Acrylic, or Southcrete 28 Flexible Additive per 50 lbs. (22.7 kg) bag. Machine mixing with a slow speed drill and mixing paddle is preferred (250—350 RPM). Higher speeds are not recommended and will entrain air. Mix the two (2) components together thoroughly until smooth. The proper consistency is obtained when the mortar is applied with the notched trowel to the substrate and the ridges formed do not flow or slump. Allow the mortar to slake for five (5) minutes, and then re-mix before use. Do not add any additional water, latex, or powder after the mortar has slaked. Re-mix mortar occasionally during use and discard after initial set in the bucket.


Detailed installation procedures may be found in the TCNA Handbook and ANSI 108.5. All materials and effected areas should remain above 50°F / 10°C (fifty degrees Fahrenheit / ten degrees Celsius) or below 100°F / 38°C (100 degrees Fahrenheit / 38 degrees Celsius) 24-hours prior and 72-hours after placement.

Apply mixed mortar liberally with the flat side of the trowel, using sufficient pressure to key into the substrate; then apply additional mortar with the notched edge of trowel leaving enough mortar to give 100% coverage with the back of the tile. Place tile while the surface is wet and tacky and spread mortar over an area no greater than can be covered with tile before the mortar skins over. Place tiles with a twisting motion and beat lightly before the initial set takes place to fully embed in the mortar. Mortar that has formed a skin should be re-troweled before applying tile. Some irregular tiles may require back buttering. During the setting of tile, it is recommended to periodically remove a tile and check to see that sufficient transfer of mortar is being attained. Industry standards require a minimum of 3/32″ (2 mm) mortar thickness after beat in. Do not adjust tiles after they have been set more than 10 to 15 minutes. NOTE: It is suggested that a mock-up for the evaluation of surface preparation techniques and application be done by applying three (3) to four (4) tiles and bonding mortar from the actual installation. These tiles should be left to cure for three (3) to seven (7) days and then removed to determine if an adequate bond has been obtained before commencement of the installation. A ¼” gap shall be left around vertical abutments to allow for structural movement and filled with an appropriate elastomeric sealant.


Water is all that is required to remove uncured mortar.


The minimum cure is reached in 12—24 hours. The setting may vary according to atmospheric conditions. Normal grouting should be done 48 hours later.



  • 75 sq. ft. per 50 lbs. When applied with ¼” x ¼” (6.4mm X 6.4mm) sq. notched trowel.
  • 65 sq. ft using ¼” x ?” (6.4mm X 9.5mm) sq. notched trowel.
  • 40 sq. ft. using ½” x ½” (13mm X 13mm).


Up to one (1) year from date of manufacture in an unopened, properly stored container.

SGM, Inc. warrants this product will perform in accordance with its intended use for a period of one (1) year from the date of manufacture. Any claim for defective product must be submitted in writing to SGM, Inc., and samples of defect must be provided. SGM, Inc.’s sole obligation will be to replace any product determined to be defective by SGM Inc. EXCEPT AS PROVIDED HEREIN, SGM, INC. MAKES NO OTHER REPRESENTATION OR WARRANTY OF ANY KIND, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR PARTICULAR PURPOSE. IN NO EVENT SHALL SGM, INC. BE LIABLE FOR DAMAGES OF ANY KIND OR NATURE, WHETHER ARISING BY CONTRACT, TORT OR OTHERWISE. SGM, INC.’S SOLE OBLIGATION WILL BE TO REPLACE ANY PRODUCT DETERMINED BY SGM, INC. TO BE DEFECTIVE.