TMS 402-602

How TMS Code Changes Could Impact How You Install Masonry Veneer

In 2022, the Masonry Society published changes to TMS Codes 402 and 602. These changes are intended to address some of the current issues that arise with the so-called “tried and true” methods of installing masonry veneer. For instance, traditional mortars, typically used for stacking brick and block, are often used to adhere thin veneer to a vertical surface. They lack the adhesive strength to properly hold the veneer in place, making the system prone to failures, and leading to dangerous situations with thin brick and stone veneer falling off buildings.

Traditional methods of installing thin masonry veneers are prone to failure, leading to dangerous situations. 

To combat these issues, the 2022 TMS 402-602 code change specifies the mandatory use of a modified adhesive mortar when installing thin masonry veneer and expands suitable the substrates they can be adhered to. In 2024, the IRC (International Residential Code) and IBC (International Building Code) are set to adopt the updated code and the changes will soon roll out across the country. 

Before your state makes the new codes mandatory, here are the four major takeaways you need to know to be prepared: 

Bye-Bye Type S — Polymer modified adhesive mortars will be required for the bonding of all thin adhered veneers.  This change will render Type S and site-mixed mortars obsolete when adhering thin masonry veneer. 

New Sizes and Formats —Larger, heavier stones may now be used – an increase from 15 pounds per square foot to 30 pounds per square foot, up to 360 square inches. For any installation above 360 square inches, you must have an installation method approved by licensed design professionals (the architect or engineer). 

Ditch the Lath & Scratch — Bonding directly to cement board, CMU, and concrete substrates will be explicitly permitted with the use of these new mortars, eliminating the need for building a lath and scratch substrate.  

Higher installations — You can now take your installs to whole new level, up to 60 feet above the ground. 

3D rendering of just one type of MVIS wall assembly

Now is the time to educate yourself and prepare your business for the changes ahead. The LATICRETE® Masonry Veneer Installation System — MVIS™ — not only meets the new standards outlined in the codes, but in many cases exceeds them. The mortars, adhesives, membranes, and sealants that comprise this system have changed the way thin masonry veneer are installed, creating safer, more durable projects, backed by a best-in-class 15/25-year warranty. 

Let LATICRETE help you through this transition with our expert knowledge and resources.

• Get free digital training for yourself and your entire team with LATICRETE University.
• Find out how MVIS can make your installs go faster, saving you time and money with our online cost calculator.
• Achieve better results and eliminate call-backs by leveraging the advice of our technical services department.
• Experience the true adaptability of the MVIS System with our database of 3D renderings outlining a variety of installation scenarios.