Why Remove Salt Affected Plaster?

Why Remove Salt Affected Plaster?

Why Remove Salt Affected Plaster?


It’s often an imperative step of damp treatment, but why remove salt affected plaster?


During our many years of working on properties around London and Berkshire and helping them rid them of their damp problems DH Damp Proofing & Plastering have often had to explain why removing salt affected plaster is so important. When a property owner sees that plaster is being removed further away from the original damp issue they are obviously concerned whether this is best practise, we can assure you it is.


Firstly, we need to understand the reason why there is salt in the plaster. Typically. where there is a rising damp issue moisture is drawn in from ground level and rises up the interior wall up to approx. 1.5m. The moisture that seeps in holds various types of salts that have dissolved.


As the moisture rises up the wall the salts are deposited on to the plaster and these salts remain in situ. The salt deposits are also referred to as efflorescence and can look like a grainy white substance on the surface of the wall.


Most people will notice the other signs of damp such as peeling paper, musty smell, mould growth and crumbling skirting boards and may not be aware of the extent of the salt deposited within the plaster. The worst course of action here would be to attempt to fix the damp problem as a DIY project as you would not know the extent of the salt in the plaster or how to properly fix the cause of the rising damp.


Failure to remove all of the salt affected plaster will result in a further damp problem occurring. The salts are moisture attracting salts and they will absorb the moisture in the air and hold it in the walls. Excess moisture in any area will result in a damp problem and a further fix will be required.


An experienced damp specialist will have the correct knowledge and equipment to assess the salt affected plaster and how much plaster should be removed to prevent recurrence. A specialist will also be able to find the root cause of the moisture ingress and will be able to put in place a plan of action to treat the cause.


Should any salt affected plaster remain then it will only be a matter of time before you start to see the signs of damp once again.

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