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Hygrothermal Performance of Timber Structures' Envelope in Future Climate

This assessment evaluates the critical parameters affecting the moisture problem in timber structures' envelope due to future climate changes. The study analyzes the impact of insulation, sheathing, and façade materials, as well as ventilation rates. Recommendations for materials and vapor barriers are provided.

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Hygrothermal Performance of Timber Structures' Envelope in Future Climate

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  1. Fraunhofer WKI, Center for Light and Environmentally-Friendly Structures, shaghayegh.ameri@wki.fraunhofer.de Shaghayegh AMERI, Norbert RÜTHER Assessment Of The Critical Parameters On Hygrothermal Performance Of Timber Structures’ Envelope

  2. Future Climate Changes!

  3. Future Climate Changes!

  4. Moisture problem

  5. Climate data • REMO daily climate data • Temperature • Relative humidity • TRY (Test Reference Year) – Hourly climate data • Temperature • Relative humidity • Wind speed and direction • Rain and snow • Sun radiation

  6. Wall assemblies

  7. Moisture content -Wall type 1

  8. Effect of external insulation material

  9. Effect of external insulation material Maximum Relative humidity in each decade in the interface between external insulation and structural element – effect of different insulation material

  10. Effect of wooden material Effect of different wood species on relative humidity of structural elements

  11. Effect of sheathing material Maximum Relative humidity of each decade in the interface between external sheathing of panel and internal insulation layer - with different sheathing material – wall type 3

  12. Type of sheathing and insulating material Effect of insulation material on relative humidity in the interface between external sheathing and insulation Effect of sheathing material on relative humidity in the interface between external sheathing and insulation

  13. Effect of ventilated façade Effect of ventilation rate in the air layer behind Façade on outer layer of structural elements Effect of façade material on outer layer of structural elements

  14. Conclusion • Wood fiber and cellulose insulating materials are recommended materials (more conservative). Mineral wool can lead to the worst moisture problems and Polystyrene can be the best material if there is no need for dry-out in the building envelope. • In wood-panel assemblies, it is recommended to use a material with low vapor resistance as external sheathing (helps faster drying out process) and a material with high vapor resistance as internal sheathing (increase internal tightness). • Vapor barriers are highly recommended in wood frame and wood panels, especially when mineral wool is used as insulation between frames prevents moisture entrance inside home. • Ventilation rate of air layers behind facade should be taken into account more precisely, especially when a material with high vapor permeability used as façade.

  15. shaghayegh.ameri@wki.fraunhofer.de Shaghayegh AMERI THANK YOU FOR YOUR ATTENTION

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