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Expert Advice

Is Rising Damp Real or a Myth?

Q: Why is it often classified as a "Myth"?

Rising damp is real, but it is 'highly over-diagnosed'. Out of 10 walls flagged for rising damp, an independent survey usually finds that at least 8 are actually suffering from simple condensation, penetrating dampness from outdoor gutters, or bridged physical damp proof courses (DPCs).

Published: 2026-04-26 • Written by Parkside Construction

Rising damp is one of the most hotly debated topics in the UK property market. You may have read online articles calling it a "total myth constructed by chemical treatment companies to trap home owners." Yet mortgage lenders regularly demand complete damp and timber surveys before approving house purchases.

Defining the capillary action behave:

The physical principle of rising damp is completely real. Ground moisture is pulled up into masonry blocks and brick courses via capillary action. This is the exact same physics that draws water up a paper towel dipped in water. Ground salts (nitrates and chlorides) are carried up with the water. When the moisture reaches the wall boundary and evaporates, these hygroscopic salts are left behind on the plaster.

Why is it often classified as a "Myth"?

Rising damp is real, but it is highly over-diagnosed. Out of 10 walls flagged for rising damp, an independent survey usually finds that at least 8 are actually suffering from simple condensation, penetrating dampness from outdoor gutters, or bridged physical damp proof courses (DPCs).