Water Repellent Mortar

Words: Dan Kamys

Amerimix Water Repellent Mortar www.amerimix.com

Amerimix Water Repellent Mortar with RainBloc GP is part of the total RainBloc system. When used with concrete masonry units that contain RainBloc, it creates a wall system that has been proven in both the lab and on jobsites to inhibit water penetration, creating a superior moisture barrier. RainBloc GP is the only patented, mortar admixture that is traceable, detectable, and measureable in hardened mortar. Available in portland, lime, and sand (AMX 410 WRM) and masonry cement and sand (AMX 510 WRM). The series of mortars includes the following features:

  • Traceable, detectable and measurable
  • RainBloc GP is proportioned correctly in every batch
  • Exceeds water repellency requirements of the “Upload Test” specified in ASTM C 1384
  • When used in conjunction with concrete masonry units manufactured with RainBloc, the National Concrete Masonry Association Rated this wall assembly “E” for excellent using ASTM E 514.
Elevating Masonry: Old Habits, Familiar Tools, and the Real Reason Masonry Contractors Aren’t Making the Switch
May 2026

Ask a masonry contractor how they run their jobsite, and the answer probably sounds familiar: paper logs, a flurry of texts, maybe a shared email thread. It works until it doesn’t. And yet, even as purpose-built field management software has become more a

The Cornerstone of Craftsmanship: Nurturing Masonry Talent Through Competition
May 2026

In the evolving landscape of skilled trades, masonry stands as a testament to enduring craftsmanship and dedication. Yet, the question of how to cultivate and showcase this vital expertise remains paramount. While the bright lights of national competition

There’s the Typical Way to Brace a Wall. And Then There’s a Better Way.
May 2026

Wall bracing is one of the most important safety considerations on any masonry jobsite, yet it is often treated as a task that happens after the wall is built. Crews return, equipment is brought in, and time is set aside to secure walls that have already

Remembering Harry McGraw
May 2026

The masonry industry has lost one of its great teachers and craftsmen with the passing of Harry Edward McGraw, who died April 26, 2026, in Houston, Texas, at the age of 93.