The swedish national board of housing, Building and Planning,recommends that all stakeholders in the construction industryperform a moisture control design to make sure that the buildingachieves good moisture resistance. Since June 1, 2006 there are nospecific requirements or quantitative values for air leakage.Although the swedish national board of housing does presentrequirement that the building envelope must be sealed so that theclient’s requirements for specific energy consumption and installedelectric power for heating purposes are met. Despite this, studiesfrom SP shows that few buildings meet the client’s requirements inspecific energy, which increases the risk of occurrence ofcondensation-related moisture damage.This study aims to evaluate curtain walls connections from airsecurity and moisture safety. Through a literature study, field trips,experiences and reflections from various sites a list of suggestions,for how various tasks should be performed in order to achieve goodair tightness and moisture control, was compiled. The work hasbeen performed in collaboration with Peab Bostad AB, Uppsala region.

This report is made by students from the bachelor programme in construction engineering at Uppsala university and it covers different pass-through roofing methods on extensive green roofs. The report also examines which existing solutions need further development. Eighty percent of all leakage occurs where vertical and horizontal surfaces meet as in pass-through. Hence, well planned solutions are required that counteract the risk of leakage at critical section. In Sweden there are currently no standards, guidelines or certifications for extensive green roofs. The extensive green roof offers a delay of rainwater, but this attribute also causes problems such as an increased moisture load on the entire roof, but especially on pass-throughs. The report, consisting mainly of literature and interview studies, has investigated and assessed pass-through solutions. The report has resulted in improved solutions consisting of the fact that perforation should be raised above the surface of the superstructure to reduce the exposure to moisture. To reduce moisture load around pass-troughs, it is also recommended to construct a gravel layer and a boundary plate that prevents vegetation from spreading. The spreading of vegetation and the occurrence of undesired vegetation must also be counteracted by maintenance, which should be performed at least twice a year, spring and autumn. A well-known opinion in the field of construction is that extensive green roofs are not in need of root protection, but as the occurrence of unwanted vegetation may have undesirable effects on the roofing membrane of the green roof, the use of root protection is always advocated.

I undersökningar av byggnadsskador visar sig takskador vara ett av de vanligaste förekommande problemen. Taktäckning med takpannor är det vanligaste i det Svenska  byggbeståndet. Arbetet är utfört med en litteraturstudie, fallstudie av nio skaderapporter ifrån Anticimex samt sju dokumenterade rivningar av tak i mälardalen. Både i litteraturstudien och fallstudierna pekar på att genomföringarna och anslutningarna på takpannetaken är de mest skadedrabbade områdena. Brister i uppdrag av underlagspapp är i fallstudierna vanligt förekommande, och har i flera fall lett till byggnadsskador. Vid omläggning av tak sparas ofta gamla plåtdetaljer vilket är en trolig förklaringen till att uppdrag av underbeslag och papp blir bristfällig. Genomföringsmanschetter och andra prefabricerade lösningar för tätning av stosar rekommenderas. Läktskiktet skall hållas fritt från skräp för att motverka röta av läkten, frostskador av takpannor och att minska vindlasten av takpannorna.  För att ge tillräcklig ventilation av takpannorna bör ströläkten vara minst 25mm i höjd, anpassning till större läkt kan ske vid flackare taklutningar. Skräp och yrsnö motverkas vid användning av nockband och fågellist i takfoten.