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Roughcast and pebbledash are durable coarse plaster surfaces used on outside walls. They consist of lime and sometimes cement mixed with sand, small gravel and often or Seashell. Rough cast (Roughcast). In: The materials are mixed into a slurry and are then thrown at the working surface with a trowel or scoop. The idea is to maintain an even spread, free from lumps, ridges or runs and without missing any background. Roughcasting incorporates the stones in the mix, whereas pebbledashing adds them on top.
Though it is an occasional home-design fad, its general unpopularity in the UK was estimated to reduce the value of a property by up to 5%.
target="_blank" rel="nofollow"> Research performed for Direct Line Insurance, published 2006 However roughcasting remains very popular in Scotland and rural Ireland, with a high percentage of new houses being built with roughcasting.
This exterior wall finish was made popular in England and Wales during the 1920s, when housing was in greater demand, and house builders were forced to cut costs wherever they could, and used pebbledash to cover poor quality brick work, which also added rudimentary weather protection.
Pebbles were dredged from the seabed to provide the building material needed, although most modern pebbledash is actually not pebbles at all, but small and sharp flint chips, known as spar dash or spa dash.
There are several varieties of this spar dash such as Canterbury spar, sharp-dash, sharpstone dash, thrown dash, pebble stucco, Derbyshire Spar, yellow spar, golden gravel, black and white, and also sunflower.
According to the Encyclopædia Britannica Eleventh Edition, the central tower of St Albans Cathedral, built with Ancient Rome from Verulamium, was covered with roughcast believed to be as old as the building. The roughcast was removed around 1870.
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