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.
From Day One to Long-Term Success: Onboarding Strategies for Contractors
January 2026

The construction industry is facing one of its toughest challenges in decades. Companies are struggling to find enough skilled workers while competing to keep the ones they have. At the same time, projects are becoming more complex, deadlines are tighter,

Matt Dibara
Business Management
Read More
Finding the Right PPE for Your Work
January 2026

When it comes to PPE, one thing’s for sure: safety isn’t one size fits all. The work you’re doing, where you’re doing it, and even what time of year it is, can all make a big difference in what gear actually works. Price, comfort, and job performance all

Greg Brown
Safety Library
Read More
Back Injuries: The Real Cost and How to Prevent Them
January 2026

The mention of back injuries makes mason contractors cringe, and for good reason. Masons lift heavy objects every day, all day long. When a person sustains a back injury, it is serious. It affects every part of their life, from their ability to perform wo

Zach Everett
Safety Library
Read More
Detailing for Durability: The 2026 Guide to High-Performance Stone Veneer Transitions
January 2026

Some of the most expensive failures involving manufactured stone veneer installations don’t come from the stone at all, but rather from the material transitions and flashing around it. Transitions are weak points in the overall cladding where water can fi

Jeff Tew
Technical Talks
Read More
Interested in working with us? Learn about and join the Masonry Alliance Program →