Decay potential in wood structures using climate data

The relationship between building materials, structures and climate is complex and there is an urgent need for more accurate methods to assess building performance. For example, the lifetime of wooden cladding is strongly dependent on the local-level climatic impact. A national map of the potential for decay in wood structures in Norway is presented based on Scheffer's climate index formula. Weather data are used from 115 observing stations for the reference 30-year period 1961-90. The climate index distribution allows for geographically differentiated guidelines on protective measures. Detailed scenarios for climate change for selected locations in Norway are used to provide an indication of the possible future development of decay rates. Climate indices allowing for the quantitative assessment of building enclosure performance may be an important element in the development of adaptation measures to meet the future risks of climate change in different parts of the world. Established quantified relations between climatic impact and material behaviour or building performance can be used as a tool for the evaluation of the need for changes in functional requirements. The presented work represents an example of a first step towards such measures. Ways to improve the reliability of the index further are also suggested.