Amerimix releases water repellent mortar with RainBloc GP

Words: Eric PetersonAmerimix, 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 is also part of the total RainBloc system and, when used with concrete masonry units (CMU) that contain RainBloc, creates a wall system with superior moisture resistance.

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. 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, unlike other water repellent additives that can increase work time.

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.
MASONRY STRONG Podcast, Episode 24 Recap: Gary Hensley, VP of Sales at Oldcastle Adams
July 2025

On this episode of the MASONRY STRONG Podcast, Gary Hensley joins Justin in Indianapolis to talk about his story within the masonry industry, how he got started, how he's seen it evolve, and where he sees it going. Why the Masonry Industry? Concrete and

The Enduring Power of Structural Masonry
July 2025

Masonry has been holding its ground for millennia — literally. And thanks to the simple brilliance of arching action, it continues to do so with strength, style, and surprising efficiency. In an era of advanced modeling and fast-moving schedules, one time

Business Building: Do Project Manager / Estimator Combos Work?
July 2025

Steve owns SJP Contractors, a mid-size general contractor specializing in commercial projects. Over the last several years, his company has grown to over $16 million in annual sales, with an average project size of $500,000 to $1,500,000, employing 45 off

Contractor Tip of the Month: Trust Is the Cornerstone
July 2025

If I can’t trust you, I can’t do business with you. I don’t care how talented you are. I don’t care how long we’ve worked together. I don’t care how many projects you’ve completed. If I can’t trust your word, then we don’t have anything to build on—figura