Primo Tools 1/8" x 1/8" Square Notch Trowel

Precision Thinset Control for Kerdi and Membrane Installations

The Primo Tools 1/8" × 1/8" Square Notch Trowel is a go-to choice for tile pros installing waterproofing membranes and working in detail-driven applications. The fine square-notch design produces shallow, uniform mortar ridges that are ideal for properly embedding Schluter® Kerdi waterproofing membrane without over-applying thinset.

Its rigid blade construction helps maintain consistent notch depth across the substrate, improving bond performance and reducing cleanup. Whether you’re installing Kerdi, working with other membranes, or setting mosaics and small-format tile, this trowel provides the control and reliability needed for clean, professional results.

Manufactured by Primo Tools, it’s a precision tool built for installers who value accuracy, efficiency, and long-term performance.

Why Tile Pros Choose It

• Kerdi-ready notch size: Ideal for Schluter® waterproofing membrane installation

• Fine square-notch pattern: Controlled, even thinset coverage

• Consistent results: Precision-cut notches maintain uniform ridges

• Professional control: Rigid blade improves spreading accuracy