Moisture and Mould Growth in Compact Roofs – Results from a Three-Stage Field Survey

摘要: Many studies around the world have reported that moisture-related problems in buildings (i.e., dampness) increase risk of health effects such as respiratory symptoms, asthma and allergy both adults children. However, there is only limited knowledge about which agents indoor air or dust cause effects. Biological pollutants moulds one explanations has been suggested. The principal objective this PhD study to mould growth possible links between humans. In study, moisture-acceptance criteria concerning developed for several building materials. general it would seem spruce chipboard a greater resistance compared plywood gypsum. Wind-breaking materials based on wood-fibre gypsum had an even other As RH increased, germination spores was faster, development strength increased all tested. experiments also showed 1% influence than temperature 8 oC when above 85%. Exposure high temperatures (up 60 oC) decreases, inhibits, growth. But exposure discontinued, continues if nothing happened. we carried out close examination low-slope compact roofs “risk construction” with regard drying-out potential were examined exposed large amounts water. results water-damaged higher expected, substantially more ventilation. observed relatively small what expected. conclusion, flat represent robust construction regarding first data from two field investigations Norwegian Swedish houses different characteristics, indicators moisture damage relative humidity accordance analysed. given show supply not constant value throughout year, but dependent outdoor temperature. According our measurements, design curves EN ISO 13788 need be modified they are used hygro-thermal analysis, shape deflection points, level varied occupancy room types. It found variation generally followed expected daily production due use house rooms. supply, calculated hourly basis, highly sensitive changes water-vapour content during day week. therefore, measurements should made long-term i.e. minimum week measurements. No link water rooms registered Neither any dampness indoors (as culturable spores). This shows reliance air, whether problem not, too unpredictable. Reported staining necessary verify problem. percentage share types ventilation, foundation period. There cases no ventilation / natural mechanical basement cellars those slab ground. older newer ones. risk-reducing strategy might useful improve carry improvements foundations order avoid damage. Knowledge agent causing limited. mould-spore concentrations (CFU) children’s bedrooms asthma/allergy among Based these results, reason one-time sampling CFU homes identify factors children living Scandinavian countries. These indicate could damp buildings.