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Products : Thin Veneer Installation Systems : TVIS Set : TVIS™ SBR Masonry Mortar Admix

TVIS™ SBR Masonry Mortar Admix

Formulated to be used with TVIS™ Premium PCL Stone Veneer Mortar, TVIS™ Premium Thin Veneer Bonding Mortar or TVIS™ Standard Thin Veneer Mortar Mix to form a high-strength surface or as an additive to a site-mixed sand/cement blend. Adds flexibility and shock resistance for use in heavy traffic conditions in industrial, commercial and institutional installations. Frost-resistant, it's excellent for exterior use in cold climates. Also for use in wet areas and underwater installations such as pools and fountains.

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Key Features

  • High strength mortar additive
  • Excellent for exterior use
  • Adds thermal shock resistance, flexibility, and water resistance
  • Mix with TVIS Premium PCL Stone Veneer Mortar, TVIS Premium Thin Veneer Bonding Mortar or TVIS Standard Thin Veneer Mortar Mix


  • TVIS™ Masonry Mortar Admix substantially adds flexural, tensile and bond strength when mixed with TVIS™ mortars.
  • The admix also adds to thermal shock and vibration resistance.


Applicable Standards

American National Standards Institute (ANSI) ANSI A118.4 of the American National Standards.


Refer to individual mortars technical data sheet for
detailed information.

Composition of Product

Proprietary blend of Portland cement, inorganic aggregates, copolymers and chemicals.

Environmental Consideration

Custom® Building Products is committed to environmental responsibility in both products produced and in manufacturing practices. Use of this product can contribute to LEED® certification.

General Surface Prep

Surfaces must be structurally sound, clean, dry and free from grease, oil, dirt, curing compounds, sealers, adhesives and other contaminants that would prevent a good bond. Glossy or painted surfaces must be sanded, stripped and cleaned of waxes, dirt and other contaminants. Ambient temperature, surfaces and materials should be 50° - 100° F (10° - 38° C) for 72 hours.

Health Precautions

Do not take internally. Avoid eye and skin contact. If eye contact occurs, immediately flush with water for 15 minutes and consult a physician.

Limitations to the Product

Do not use with polymer modified mortars unless otherwise specified. Refer to individual mortars technical data sheet for detailed installation and mixing instructions.

Mixing Ratios

  • 50 lbs (22.68 kg) Premium PCL Stone Veneer Mortar mixed with 3 4 quarts (2.8 L 3.78 L) of SBR Masonry Mortar Admix.
  • 50 lbs (22.68 kg) Premium Thin Veneer Bonding Mortar mixed with 5 quarts (4.73 L) of SBR Masonry Mortar Admix.
  • 50 lbs (22.68 kg) Standard Thin Veneer Mortar Mix mixed with 6 quarts (5.68 L) of SBR Masonry Mortar Admix.

For a sand/cement site mix, dry-blend one 94 lb (42.68 kg) bag of Portland cement with one 100 lb (45.36 kg) bag of #60 silica sand and mix with 5 gallons (18.92 L) of SBR Masonry Mortar Admix.

Mixing Procedures

Mixing: Thoroughly mix mortar with SBR Masonry Mortar Admix to a smooth, paste-like consistency. Mix by hand or use a low speed (150-200 RPM) 1/2" (13 mm) drill. Let slake or stand 5-10 minutes, stir again and use. Stir occasionally to keep fluffy, but do not add more additive.

Application of Product

USE CHEMICAL-RESISTANT GLOVES, such as nitrile, when handling product.

Refer to individual mortars technical data sheet for proper surface preparation and application instructions.

Curing of Product

Allow to cure for a minimum of 24 hours before filling joints with Veneer Pointing Mortar depending upon temperature and humidity. In areas that will be continually wet (e.g. swimming pools, fountains), it's recommended that the completed installation be cured a minimum of 14 days and allowed to thoroughly dry before water submersion. Curing times vary with weather conditions and humidity; special conditions may require curing up to 28 days.

Cleaning of equipment

Clean with water before the material dries.

Product Maintenance

Properly installed product requires no special maintenance.

Ordering Information


5 gallon (18.92 L) pail

Warranty Information

Product Warranty

Custom® Building Products warrants to the original consumer purchaser that its product shall be free from defects in material and workmanship under normal and proper usage for a period of one year following the date of original purchase. Custom's® sole liability under this warranty shall be limited to the replacement of the product. Some states, countries or territories do not allow the exclusion or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This warranty will not extend to any product which has been modified in any way or which has not been used in accordance with Custom's® printed instructions. Custom® makes no other warranties either expressed or implied. This warranty gives you specific legal rights, and you may have other rights that vary from state to state or from one country/territory to another. For details and complete warranty information, contact Custom® Building Products or visit

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