Amerimix Releases Water Repellent Mortar with RainBloc GP

Words: Bronzella Cleveland

Amerimix, a manufacturer of preblended mortar, grout and stucco mixes, has released its new water-repellent masonry mortar, Amerimix Water Repellent Mortar (WRM) with RainBloc GP.

With proven performance both in independent laboratory testing by The National Concrete Masonry Association (NCMA) and on the jobsite, Amerimix WRM with RainBloc GP inhibits water from penetrating a wall system. Amerimix WRM with RainBloc GP also is part of the total RainBloc system and, when used with concrete masonry units (CMUs) that contain RainBloc, creates a wall system with superior moisture resistance, the company reports.

The patented RainBloc GP technology in Amerimix WRM is the only water-repellent agent that is traceable and measurable in the hardened mortar, verifying that the exact proportions for optimal water resistance are included in every bag and every batch. According to the manufacturer, Amerimix WRM also performs as well as mortar without water-repellent additives, offering the same superior bond strength and extended mortar board life with less re-tempering required.

And since RainBloc GP is factory blended into Amerimix WRM, masons can save time and money with no measuring, additional steps, waste or mixing mistakes at the jobsite, while also eliminating the need for stocking liquid admixtures. Third-party field testing by the NCMA also confirms that Amerimix WRM helps to make application easier for masons with no impact on the feel, application or workability of the product.

Amerimix WRM with patented RainBloc GP technology is designed for applications where a water-repellent mortar is required in combination with CMUs that contain RainBloc water repellent. Ideal for both interior and exterior applications, Amerimix WRM is specifically engineered to provide long water retention, exceptional workability, and superior bond strength over masonry substrates.

The Return of Restraint: How "Quiet Luxury" Is Influencing Masonry Design
November 2026

For years, exterior design seemed to follow a familiar cycle: bigger statements, bolder contrasts, and whatever trend happened to dominate social media that season. Today, many customers are asking for something different. They're asking for homes that fe

Rent or Buy? Making Smarter Mixer Equipment Decisions
November 2026

For masonry contractors, deciding whether to rent or purchase a concrete or mortar mixer involves more than comparing rental rates with purchase prices. Equipment availability, crew productivity, maintenance, and frequency of use can all influence the lon

Bonding with Masonry 2026: Q4
November 2026

This issue’s questions come from an Engineer and a Masonry Inspector. What questions do you have? Send them to info@masonrymagazine.com, attention: Technical Talk. Q. An Engineer states that he attended a seminar and was told that to design reinforced

Hohmann & Barnard, Inc. Returns as a Cornerstone Partner in 2027
November 2026

The Mason Contractors Association of America (MCAA) is thrilled to announce that Hohmann & Barnard, Inc. will return as a Cornerstone Partner in the 2027 Masonry Alliance Program.