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A damp-proof course (DPC) [2] is a barrier through the structure designed to prevent moisture rising by capillary action such as through a phenomenon known as rising damp. Rising damp is the effect of water rising from the ground into property. [3] The damp proof course may be horizontal or vertical. [4]
Removing water with good drainage will remove any form of dampness. Once done, and dampness remains, the next step is to look for the presence of a damp-proof course. [14] If a damp-proof course is present, it is likely to be functioning, as the materials from which damp proof courses are manufactured tend to have a long lifespan.
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 ).
Damp proofing is another aspect of waterproofing. 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 ...
This had advantages, but in low-lying districts it would remain permanently damp. The upper floors would have been of wooden planks laid on joists; in poorer houses there were no plastered ceilings. Walls may have been plastered or not. Some houses had a slate damp-proof course but some had none. After poor weather or flooding the walls would ...
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A general term for flashing a chimney to cover the intersections of the chimney and install a damp proof course (DPC) Kickout flashing At the very bottom of a roof/wall intersection, the lowermost step flashing specially formed to deflect water away from the wall. Valley flashing In the valley of two intersecting roof planes.
The improved damp-proof course arrested water ingress and with the suspended floors halted wood rot. [14] The overcrowding and deterioration of the pre-regulation terraced houses caused increasing concern. Local authorities were empowered by the Housing Act 1930 to conduct slum clearance by purchasing unfit properties compulsorily and ...