Rising damp, a worldwide phenomenon, is a major cause of decay to masonry materials such as stone, brick and mortar. Even when mild it can cause unsightly crumbling of exterior masonry and staining of internal finishes. It may also cause musty smells in poorly ventilated rooms. Rising damp occurs as a result of capillary suction of moisture from the ground into porous masonry building materials such as stone, brick, earth and mortar
Ventilation is an important element of an energy-efficient home. Air sealing techniques can reduce air leakage to the point that contaminants with known health effects such as formaldehyde, volatile organic compounds and radon are sealed into the house. Ventilation also helps control moisture, which can lead to mould growth and structural damage. In a tight home, mechanical ventilation is necessary to achieve effective ventilation.
HRV or heat recovery ventilation or ERV, energy recovery ventilators are methods used to reduce traditional heating and cooling demands of buildings, both commercial and residential.