Tilemaster Anti-Fracture Uncoupling / Decoupling Mat | 20mTilemaster Anti Fracture Uncoupling Decoupling Mat 20m is designed for use on floor tile installations to prevent substrate lateral movement from cracking the tiled finish. Tilemaster Anti Fracture Mat can be used in a wide range of applications to absorb lateral movement from substrates and to bridge stress shrinkage cracking in substrates to prevent such movement from being transferred to the tiled finish.