5a

Figure 4: Spot bonding, either to correct for slab flatness or uncollapsed mortar ridges during installation, is an unapproved method for floors. Attempts to collapse the mortar ridges will be impeded by the built-up mortar spots, creating voids under the tile. Future cracking is highly likely.

Figure 4: Spot bonding, either to correct for slab flatness or uncollapsed mortar ridges during installation, is an unapproved method for floors. Attempts to collapse the mortar ridges will be impeded by the built-up mortar spots, creating voids under the tile. Future cracking is highly likely.

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