To limit the probability of the inadequate adhesion of tiles to the substrate, which could lead to an inability to resist expected impact, gravity or lateral loads, which could lead to the dislodgement of tiles, which could lead to compromised protection for moisture-vulnerable substrates.
This is to limit the probability of the deterioration of the substrate, which could lead to:
This is to limit the probability of the growth and spread of fire, which could lead to harm to persons.