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Why is a scratch coat recommended to be applied to the tile back during installation?

Adhesive-header-image

Why is it recommended?

For improved bonding between the tile and substrate.
A good adhesive contact and coverage will ensure better distribution of impact and stresses received by the tile finish, thereby reducing possible tile damage.
 

How is it done?

After applying a notched coat of the adhesive mix onto the substrate, use the flat side or notched side of the trowel and comb a thin layer of adhesive onto the back of the tile, then quickly lay the tile.
 

Ways to achieve improved bonding

(1)

Choosing a suitable notch-size trowel to apply the adhesive mix.
Selection criteria of the notch size include factors such as
(i) size of the tile / stone,
(ii) substrate accuracy and
(iii) area of final use.

(2)

Application of adhesive onto the substrate and the tile back with a notch trowel 
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(3)

Press in the tile to ensure that the adhesive layer is well compacted and rid of air voids. Excess adhesive to ooze out at the sides.
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Mapei Far East Pte. Ltd.
28, Tuas West Road - Singapore 638383
 - Fax +65 68621012 -