The cause of rising damp in homes is the lack of or breakdown of an adequate damp proof course. If left unchecked, rising damp can cause damage to brick, concrete and wood structures, and cause wet rot and the dreaded dry rot. (Source: Guardian 29/02/2008)
Taken from World Health Organisation guidelines on dampness and mould. 'Microbial pollution is a key element of indoor air pollution. It is caused by hundreds of species of bacteria and fungi, in particular filamentous fungi (mould), growing indoors when sufficient moisture is available.This document provides a comprehensive review of the scientific evidence on health problems associated with building moisture and biological agents. The review concludes that the most important effects are increased prevalences of respiratory symptoms, allergies and asthma as well as perturbation of the immunological system.'
We first create a series of horizontal drill holes along the mortar course. Typically these holes are 12 mm in diameter and drilled at 120 mm intervals. Then we insert a nozzle into the first drilled hole, and then inject the DPC cream while withdrawing the nozzle at a steady rate. We stop injecting just before removing the nozzle from the wall. Repeat for remaining holes. Once the DPC cream is installed, it diffuses before curing to form a water-repellent resin. This prevents the damp from rising up the wall.