Built with a closed-cell, extruded polystyrene (XPS) core, Blue Board creates an absolute barrier against moisture—completely eliminating the risk of mold, mildew, rot, and subfloor failures. Simultaneously, its high-density core delivers exceptional thermal performance, stopping heat transfer cold and eliminating cold spots under your tile.

Wrapped in a high-strength fiberglass reinforcing mesh fully embedded in a cement-based resin coating, it gives thinset mortar the ultimate mechanical grip for maximum tile adhesion. Yet, it remains incredibly light and easy to carry up flights of stairs by a single installer, reducing fatigue while offering rigid support for heavy stone or large-format tile over weight-sensitive framing.

Forget heavy power saws, flying cement shards, and toxic dust masks. Simply score, snap, and install cleanly and precisely with a standard utility knife. Enjoy total design freedom: Blue Board supports any tile size, material, or weight with zero limitations. Use it confidently with any standard cement-based thinset, modified mortar, or grout—no expensive proprietary glues required.