Fuktrelaterade skador i växthus med trästomme: fältstudier av konstruktionsdetaljer och principer för att minska fuktbelastning

Abstract

This thesis examines moisture-related damage in timber greenhouses and investigates how such damage develops in relation to construction details. The study aims to identify typical moisture problems and discuss how they can be prevented through improved design of structural details. The research is based on field studies of three timber greenhouses, where visual inspections were conducted to document signs of moisture exposure, biological growth, and material deterioration. Observations focused particularly on areas where water frequently comes into contact with wood and where drying conditions are limited. The results were analyzed using building physics principles and existing literature on moisture in wooden structures. The study shows that moisture-related problems tend to occur in recurring locations within the construction, particularly in lower parts of the structure and in connections between glass and wood. These areas are often exposed to rainwater runoff, splashing, or trapped moisture combined with limited possibilities for drying. Based on the observations, a number of constructive design principles are discussed that can reduce moisture exposure and improve drying conditions. The results suggest that relatively small design adjustments, such as improving water drainage and reducing direct contact zones between glass and wood, can contribute to increasing the durability of timber greenhouse constructions.