Remediation of damp homes and its impact on health The object of this inventory study was to study the effect on the indoor environment and allergy parameters after adequate measures were taken in damp-damaged one-family houses with HDM allergic occupants. Moisture may cause damage on building material and increase allergic symptoms. If adequate measures considering moisture are taken in a damaged building this should improve the indoor air quality and thereby reduce the allergic symptoms in allergic patients. In this study fifteen patients with allergy to house dust mites (HDM) and living in houses with severe moisture problems were selected. Several technical parameters were measured before and after (one year or more) adequate taken measures. These parameters were e.g. ventilation rate, HDM-content in e.g. mattresses, temperature and moisture conditions in indoor air and in the damaged/damp building structures. In parallel to the technical measurements, questionnaire and medical parameters on each patients including HDM-specific IgE, ECP, symptom score and spirometry were followed.