Cementos Molins

How to solve humidity problems in skirtings

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The deterioration of the lower parts of walls due to humidity ascending via capillary action from the foundations, is one of the most common construction faults in buildings.

The moisture coming from the ground penetrates the foundation and rises through it towards the upper walls by capillarity. The salts entrained during this process, are deposited inside the wall and in the renders.

The continuous presence of water and moisture in the wall produces the hydration and increase of volume of these salts, which causes the destruction of the wall and the render. The phenomenon is all the faster the greater the amount of water and salts present in the system.

The solution is to use PROPAM® SEC, ie a water-repellent mortar, impermeable to rainwater, highly decorative finish and easy to apply, which allows to repair walls affected by humidity and efflorescence, as well as to prevent humidity on new constructions.

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Remove the degraded render and the one located at least 1 meter above the area affected by the humidity, until obtaining a firm and stable substrate.

In hot weather or with very absorbent substrates, it is advisable to moisten it in advance.

Place mesh where different substrates (columns and slabs) meet.

On stone walls, remove the disintegrated parts to a depth of 2-5 cm and fill with the product and rubble or stones. It is convenient in these walls to fix a galvanized mesh and apply the product additivitated with PROPAM® LATEX 1: 4 with water.

On substrates of smooth concrete or without absorption it is recommended to apply PROPAM® FIX as a primer.


Knead PROPAM® SEC with a slow electric beater (500 rpm) and clean water until a homogeneous, lump-free paste is obtained.

Extend the paste preferably by projecting it with a pallet on the substrate until a thickness of at least 2 cm is obtained at any point. It can be projected by machine.

Finish (scraping, fracturing, dropping) when the product has the required consistency, usually between 1 and 6 hours after application. It must be covered with materials that are very breathable and do not create a barrier to water vapor.


  • Do not apply in unventilated areas to avoid condensation.
  • Apply between +5 and + 35 ° C.
  • Do not apply to surfaces with an angle of less than 10%.
  • Do not apply to submerged areas.
  • It must be separated 1 cm from the ground to prevent capillary ascent through the product.
  • The problems of capillary ascension can be solved in a traditional way, using lime mortars of the range REVAT® CAL of PROPAMSA.



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