Abstract
The building constructions investigated in this work are pitched wooden roofs with exterior vertical drainpipes and wooden load-bearing system. The aim of this research is to further investigate the building defects of pitched wooden roofs and obtain an overview of typical roof defects. The work involves an analysis of the building defect archive from the research institute SINTEF Building and Infrastructure. The findings from the SINTEF archive show that moisture is a dominant exposure factor, especially in roof constructions. In pitched wooden roofs, more than half of the defects are caused by deficiencies in design, materials, or workmanship, where these deficiencies allow moisture from precipitation or indoor moisture into the structure. Hence, it is important to increase the focus on robust and durable solutions to avoid defects both from exterior and interior moisture sources in pitched wooden roofs. Proper design of interior ventilation and vapour retarders seem to be the main ways to control entry from interior moisture sources into attic and roof spaces.
Highlights
Wood is mainly used for the load-bearing systems, which in the following paper are referred to as wooden roofs
The basic principle is that the roof construction must be ventilated in order to transport: (1)
Design Principles moisture from the roof, and prevent mould growth and other moisture damage; and Theand basic principle is unwanted that the roofmelting construction must be ice ventilated in order togutters
Summary
In the Nordic countries, many buildings have wooden frames. Such constructions are especially common for small houses. There is a well-developed tradition of using wood for exterior cladding, load-bearing systems, and interior cladding. Wood is mainly used for the load-bearing systems, which in the following paper are referred to as wooden roofs. The use of wood in buildings may not always be favourable due to robustness issues and climate exposure (e.g., mould, rot, built-in moisture). This means a special focus is needed to develop wooden building technology
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