All material contains moisture to greater or lesser degrees. Those that are porous – concrete, mortar, wood – begin their life with their pores filled with water. As they dry, the water content drops and the material contracts. Other materials, like brick, begin life completely dry and water enters its pores over time, causing it to expand. Because of this, most of a building’s problems can be traced to moisture. To prevent ill effects, understanding moisture and how it interacts with and affects building materials and elements is crucial.

What is damp?

Put simply, damp is the localised, excessive build-up of naturally-occurring moisture that has no means of escape. While we have different names for damp, depending upon where and how it presents itself, for the…

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