Absorption Imbalance

Absorption imbalance refers to a situation where a material or structure unevenly absorbs moisture, often due to differing types of material, treatments, or conditions. This can lead to vapour becoming trapped.

A common example is where one section of plaster is replaced as part of a damp-proofing treatment with impermeable plaster, often known as damp proofer’s slurry. Vapour becomes trapped in the permeable plaster surrounding the slurry. Unable to evaporate out, it can condense. This often causes calcium sulphate salts in the mortar to crystallise around the slurry, leading to unsightly damage to the surface of the wall.

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