Cementos Molins

Fixing tiles on plaster prefabricates

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In recent years, there has been a significant increase in using plaster and/or Plaster of Paris prefabricates (plaster plates and panels, ceramic blocks coated with Plaster of Paris) for inner partitioning when building homes; the need to complete the projects in reduced time has meant increasing mechanised building procedures and the use of this type of materials.

 Due to the nature of this type of substrates, a series of precautions must be taken when fixing ceramic tiles.

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Remove the excess assembly adhesive to fix the prefabricate.

The support must be resistant, and appropriate smooth.

Using raceways to lay the electrical wiring, heating and water pipes etc., creates dust which falls onto the surface of the prefabricate.

Clean the remains of dust or dirt with a slightly dampened sponge before starting to fix the tiles.

It is advisable to apply a primer with PROPAM® DUR to consolidate the surface. If the plaque is waterproofed, it will not be necessary to carry out this operation.


Spread VAT® EXTRA onto the support using a notched trowel and the Floating and buttering technique when the part is more than 900 cm2.

Press the tiles so that they form a solid surface.

Leave a minimum grouting joint width and regrout after 24 hours using the grouting range BORADA® by PROPAMSA.


  • The plaster of Paris paste or adhesive used to install the prefabricate must be dry and hardened before fixing the tiles.
  • Residual humidity on the support must not exceed 3%.
  • To fix tiles with 6% water absorption or more, you can use PAM® ESPECIAL YESO.
  • In order to fix 3% water absorption tiles or lower, use VAT® PORCELÁNICO FLEXVAT® FLEXIBLE or PAM® FLEX.



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