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Plaster removed from a wall as part of a rising damp treatment. The wall was replastered using a sand-cement render. BS6576:2005 [61] states that "the function of the new plaster is to prevent hygroscopic salts that might be present in the wall from migrating through to its surface, while still allowing the wall to dry."
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.
Walls: in areas where brick was used, walls were built using a simple Flemish bond, meaning a single-wythe, 9-inch wall. They all had to have a damp course and foundations. The damp course could be a layer of asphalt in bricks at least 9 inches (23 cm) below the wooden floor beams; later it would be salt-glazed bricks or slate.
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 ...
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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.
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.