Cementos Molins

Fixing ceramic tiles on outdoor patios

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The ceramic tiles fixed on terraces, roofs and other similar outdoor pavements are exposed to several aggressive environment conditions (temperature changes, rain, freezing weather, etc.) which can cause them to expand and deform considerably, and therefore they must be fixed following a very demanding method.

Temperature changes cause the tiles to move and expand, and the fixing material must also be able to withstand these conditions.

To fix the tiles correctly, guaranteeing optimum adherence, it is necessary to use a very flexible adhesive mortar VAT® FLEXIBLE /PAM® FLEX.

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Check that the support is resistant, perfectly set, clean of any dust, paint, oil…

Check the smoothness of the support with a 2 m long ruler; any differences must be less than 5 mm, and repair any faults by filling the gaps with mortar.


Knead with a slow electric beater (500 rpm).

Spread VAT® FLEXIBLE / PAM® FLEX on to the support with a notched trowel.

Correctly plan and implement the movement joints; intermediate joints every 10 to 25 m2, and perimeter joints at least 5 mm wide in the joins between the ceramic pavement and the vertical wall.

Leave a minimum grouting joint width of 5 mm and regrout after 24 hours using the grouting range BORADA® by PROPAMSA.


  • Do not apply in wet weather, or with temperatures of <5ºC or >30ºC.
  • With poor absorbency supports, open the pore with water and hydrochloric acid at 50%.
  • Use the Floating and buttering method if the tile size is larger than 900 cm2.
  • For quick service and fixing large sized, low absorption tiles, use VAT® FLUID / VAT® FLEX RAPID.



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