In this insightful episode, Suzan Chin-Taylor welcomes Charlie Lerman, a.k.a. The Grout Geek, to break down the often misunderstood differences between hydrophilic and hydrophobic polyurethane grouts.
If you think it’s as simple as “water-loving” versus “water-repelling,” think again. Charlie explains the deeper technical distinctions—like flexible vs. rigid, freeze-thaw resistance, viscosity under pressure, and real-world bond strength—that can make or break a grouting project.
Whether you’re sealing cracks, controlling inflow and infiltration (I&I), or working in seismically active or freeze-prone regions, this episode will help you make smarter, longer-lasting decisions on the job site.
Host: Suzan Chin-Taylor | Guest: Charlie Lerman
Listen on Spotify:
Watch on Youtube:
What You’ll Learn:
- Why flexibility vs. rigidity should be your first decision point—not hydrophilic vs. hydrophobic
- The behavior of grouts under pressure, and how reaction timing affects flow and fill
- How environmental conditions (like dry soils or freeze cycles) should influence product selection
- The myth of lab-tested bond strength vs. reality in contaminated field conditions
- The financial impact of recurring leaks, confined space entries, and water treatment costs
- Why it pays to consult your grout manufacturer—even for familiar applications
Pro Tips from the Grout Geek:
- Hydrophilics need moisture—not saturation—to remain stable.
- Hydrophobics are ideal for dry climates and freeze-thaw environments.
- Flexible grouts are best for cracks, joints, and anywhere movement is expected.
- Use manufacturer support—you might need a custom formulation that isn’t on the datasheet.
- Low viscosity doesn’t always equal better penetration—especially in reactive hydrophilics.
Contact Information:
Charlie Lerman, Western Regional Manager, NCFI Geotechnical
Websites: ncfigeo.com
Email: thegroutgeek@gmail.com
LinkedIn: https://www.linkedin.com/in/charlielerman
Conclusion:
In this episode of the Smells Like Money podcast, Charlie Lerman—The Grout Geek—shed light on the critical yet often overlooked distinctions between hydrophilic and hydrophobic grouts. From understanding how these materials react in real-world conditions to the importance of selecting flexible vs. rigid systems first, this conversation was packed with actionable insights for contractors, engineers, and municipal teams alike.
The big takeaway? Product selection isn’t just about chemistry—it’s about environmental context, application needs, and long-term performance. And when in doubt, lean on your grout manufacturer—they may have solutions you don’t even know to ask for.
If you want to stop chasing leaks and start sealing smarter, this episode is a must-listen.
Until next time—keep growing, and keep it flowing. 💧
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Connect with Suzan Chin-Taylor, host of The DooDoo Diva’s Smells Like Money Podcast:
Website: www.creativeraven.com | https://thetuitgroup.com/
LinkedIn: https://www.linkedin.com/in/creativeraven/
Email: raven@creativeraven.com
Telephone: +1 760-217-8010
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