How long should traffic be kept off horizontal portland cement mortar installations?

Keeping traffic off horizontal portland cement mortar installations for 72 hours is crucial for several reasons. This time frame allows the mortar to gain sufficient strength during the curing process, which is essential for ensuring durability and stability. Within the first few days, the chemical reactions that contribute to the strength of the mortar continue to develop, and premature traffic can disrupt this process, leading to potential cracking or failure of the installation.

Moreover, allowing this duration ensures that the cement has adequately cured, which directly impacts the performance of the tiled surface. Traffic can apply stresses that exceed the material's early strength, resulting in issues such as displacement of tiles, improper adhesion, or even surface damage. Thus, adhering to the 72-hour guideline helps in achieving optimal performance of the mortar and the overall installation, ensuring longevity and functionality.