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This paper investigates the airtightness performance of various timber-based construction systems through on-site testing and comparative analysis. The study encompasses four distinct building typologies: cross-laminated timber (CLT), structural insulated panels (SIP), conventional timber frame constructions, and prefabricated I-joist systems with straw insulation. Airtightness measurements were conducted using the fan pressurization method following ISO 9972. The results are evaluated in the context of current regulatory requirements and low-energy building standards. The results show that airtightness performance is strongly influenced by junction detailing, continuity of air barriers, and construction execution, factors that outweigh the influence of the structural system itself. The findings contribute to a better understanding of how construction system selection influences the air permeability of timber-framed buildings, with implications for both energy performance and indoor environmental quality.

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The Hidden Challenge in Wooden Constructions: Investigating and Enhancing Envelope Airtightness

  • 会议论文

  • 发表日期：

    2026年

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  • Ferenc Kádár,
  • Andra Raluca Boroş,
  • Ligia Moga

摘要

This paper investigates the airtightness performance of various timber-based construction systems through on-site testing and comparative analysis. The study encompasses four distinct building typologies: cross-laminated timber (CLT), structural insulated panels (SIP), conventional timber frame constructions, and prefabricated I-joist systems with straw insulation. Airtightness measurements were conducted using the fan pressurization method following ISO 9972. The results are evaluated in the context of current regulatory requirements and low-energy building standards. The results show that airtightness performance is strongly influenced by junction detailing, continuity of air barriers, and construction execution, factors that outweigh the influence of the structural system itself. The findings contribute to a better understanding of how construction system selection influences the air permeability of timber-framed buildings, with implications for both energy performance and indoor environmental quality.