|Rising damp is a common form of dampness encountered in buildings and it is very likely that a high proportion of older buildings are affected by rising damp to some degree or another.
Rising damp in buildings is defined as the vertical passage of ground moisture up through the pores of a permeable wall structure. Capillary dampness is also another known name.
The height to which the moisture will rise depends on several factors including pore structure and rate of evaporation. Masonry containing a high proportion of fine pores will allow the moisture to be carried up the wall in the finer pores and not those of large diameter.
The major paths (e.g.bricks) through which the moisture rises are the mortar beds (brick joints). In effect the mortar beds form the only continuous pathways for water rising through the wall. If a house is built from impervious bricks then moisture can still rise through the mortar bed but if an impervious mortar is used then no water will rise even if the bricks are very porous. The mortar beds will form an important part in the chemical treatment for rising dampness.
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