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Rising damp is widely referred to in Victorian literature and the Public Health Act of 1875 introduced the requirement for a damp-proof course in walls to prevent rising damp. [14] An entry in the British Medical Journal from 1872 describes the phenomenon of rising damp as follows:
Rising damp is the effect of water rising from the ground into property. [3] The damp proof course may be horizontal or vertical. [4] A DPC layer is usually laid below all masonry walls, regardless if the wall is a load bearing wall or a partition wall. A damp-proof membrane (DPM) is a membrane material
Penetrating damp is visible as a darker patch on the plaster lining of the inner wall, usually starting at floor level on the ground floor and rising up from there, hence the term 'rising damp'. In extreme cases, salt leached out of the wall forms crystals on the surface of the plaster as the water evaporates.
Masonry walls are built with a damp-proof course to prevent rising damp, and the concrete in foundations needs to be damp-proofed or waterproofed with a liquid coating, basement waterproofing membrane (even under the concrete slab floor where polyethylene sheeting is commonly used), or an additive to the concrete.
"The main damp issue to be avoided with external wall insulation is rising damp. If you already have a problem with this, then it will have to be fixed before the insulation is fitted, otherwise you run the risk of trapping the damp inside the wall structure and so making the problem worse."
The purpose of the dado treatment to a wall is both aesthetic and functional. Historically, the panelling below the dado rail was installed to cover the lower part of the wall which was subject to stains associated with rising damp; additionally it provided protection from furniture and passing traffic. The dado rail itself is sometimes ...
This reduces the compressive strength of the mortar but allows the wall system to function better. The lime mortar acts as a wick that helps to pull water from the brick. This can help to prevent the older brick from spalling. Even when the brick is a modern, harder element, repointing with a higher ratio lime mortar may help to reduce rising damp.
The purpose of a Vertical Damp Proof Barrier is to prevent the ingress of damp and water into subterranean structures such as basements, cellars, tunnels and earth shielded buildings. (Also known as Earth sheltered buildings ).