Moisture Safety of Tall Timber Facades—LCA and LCC Calculations of Damage Scenarios
The use of timber structures in tall buildings increases the demand of moisture safety in facades. Moisture in the facade could result in unwanted consequences such as mold, decay and distortions in wood materials. This might have impact on the indoor climate and the building quality. The aim of this study was to evaluate the moisture safety regarding the composition of the façade and connection details such as windows and balconies. Scenarios with possible damages were evaluated with LCC (Life Cycle Cost) and LCA (Life Cycle Assessment). The scenarios were developed based on experiences from manufacturers and insurance companies and on research investigations of damages. LCC and LCA includes replacement of damaged building materials, transports of new materials and damaged materials for recycling or energy recovery and the use of energy for drying of moisture in the structure. Both light frame structures and CLT (Cross Laminated Timber) structures were included. Improvements of detail connections to increase moisture safety were also evaluated regarding risk of damage, costs and environmental impact. The results show that even small and inexpensive improvements will increase the moisture safety and significantly reduce the risk of damage.
KeywordsTimber facades Moisture safety LCA LCC
This study was supported by WoodWisdomNet+ research program; project Tall Timber Facades (TallFacades). We would like to thank Martinsons Byggsystem, Moelven Byggmodul and Vinnova for supporting the work.
- 1.S. Ott, et al., Final Project Report. Tall timber facades—Identification of Cost-effective and Resilient Envelopes for Wood Constructions (TallFacades) 31.07.2017Google Scholar
- 2.K. Gradeci, N. Labonnote, B. Time, J. Köhler, Mold models applicable to wood-based materials—A generic framework, (Accepted manuscript) Energy Procedia, 2017Google Scholar
- 3.C. Brischke, L. Meyer-Veltrup, Modelling timber decay caused by brown rot fungi, Materials and Structures, 2015Google Scholar
- 4.C. Brischke, E. Frühwald Hansson, Modeling biodegradation of timber—Dose-response models for above-ground decay and its climate-dependent variability, International Conference on Structural Health Assessment of Timber Structures, Lisbon, 16–17 June, 2011Google Scholar
- 5.Institut für Bauforschung e.V., Analyse der Entwicklung der Bauschäden und der Bauschadenkosten, Gemeinschaftsprojekt vom Bauherren-Schutzbund e.V., der AIA AG und dem Institut für Bauforschung e.V, Forschungsbericht: 19.02.2015 IFB – 14553Google Scholar
- 6.L. Olsson, Laboratoriestudie av träfasaders täthet mot slagregn, SP Rapport 2012:45. ISBN 978-91-87017–63-6. Borås 2012 (In Swedish)Google Scholar
- 7.A. Jansson, Putsade enstegstätade regelväggar. Erfarenheter från undersökningar som SP har utfört. SP Rapport 2015:01. ISBN 978-91-88001–27-6. Borås 2015 (In Swedish)Google Scholar
- 8.EN 15804, Sustainability of construction works—Environmental product declarations—Core rules for the product category of construction products, 2012Google Scholar
- 9.ISO 15686-5, Buildings and constructed assets—Service life planning—Part 5: Life-cycle costing, 2008Google Scholar
- 10.Sektionsfakta®–ROT, Teknisk-ekonomisk sammanställning av rot-byggdelar, 15/16, Wikells Byggberäkningar AB, 2015 (In Swedish)Google Scholar