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A platform for research: civil engineering, architecture and urbanism
Impact of built-in moisture on the design of hygrothermally safe cross-laminated timber external walls: A stochastic approach
https://orcid.org/0000-0001-7792-9035
https://orcid.org/0000-0002-1424-6154
https://orcid.org/0000-0003-1368-4301
Abstract In terms of hygrothermal performance, solid wood panels composed of cross-laminated timber (CLT) are sensitive to moisture. However, to the best of our knowledge, no clear indications of critical initial moisture conditions for CLT envelopes regarding the dry-out of built-in moisture have been provided. Therefore, our main objective was to set critical limit values for CLT external wall design in terms of their initial moisture content (built-in moisture) and dry-out capacity (vapour resistance of wall layers) using a stochastic approach. The focus is on five types of CLT external walls that differ in their dry-out capacity. The key factors in the hygrothermally safe design of the CLT external envelope are sufficient dry-out capacity and control of the CLT initial moisture content level during the construction phase. The results of our stochastic analysis confirmed that a high initial moisture content in CLT causes a high mould growth risk when CLT is covered with vapour tight layers. Therefore, the limit values for critical initial moisture content of CLT and the water vapour resistance of the wall layers that ensure dry-out capacity of different external walls to prevent the risk of mould growth on the CLT surface in a cold and humid climate were determined. These limit values take into consideration the weather conditions during the construction phase and classes of material sensitivity to mould growth.
Highlights Built-in moisture is problematic when dry-out of CLT in external wall is prevented. Favourable conditions for mould vary during the seasons in which CLT is installed. Design of CLT external wall requires wind barrier with high vapour permeability. Vapour tight thermal insulation requires factory-dry CLT before installation. Hygrothermal criteria as limit values for CLT external wall layers were determined.
Impact of built-in moisture on the design of hygrothermally safe cross-laminated timber external walls: A stochastic approach
https://orcid.org/0000-0001-7792-9035
https://orcid.org/0000-0002-1424-6154
https://orcid.org/0000-0003-1368-4301
Abstract In terms of hygrothermal performance, solid wood panels composed of cross-laminated timber (CLT) are sensitive to moisture. However, to the best of our knowledge, no clear indications of critical initial moisture conditions for CLT envelopes regarding the dry-out of built-in moisture have been provided. Therefore, our main objective was to set critical limit values for CLT external wall design in terms of their initial moisture content (built-in moisture) and dry-out capacity (vapour resistance of wall layers) using a stochastic approach. The focus is on five types of CLT external walls that differ in their dry-out capacity. The key factors in the hygrothermally safe design of the CLT external envelope are sufficient dry-out capacity and control of the CLT initial moisture content level during the construction phase. The results of our stochastic analysis confirmed that a high initial moisture content in CLT causes a high mould growth risk when CLT is covered with vapour tight layers. Therefore, the limit values for critical initial moisture content of CLT and the water vapour resistance of the wall layers that ensure dry-out capacity of different external walls to prevent the risk of mould growth on the CLT surface in a cold and humid climate were determined. These limit values take into consideration the weather conditions during the construction phase and classes of material sensitivity to mould growth.
Highlights Built-in moisture is problematic when dry-out of CLT in external wall is prevented. Favourable conditions for mould vary during the seasons in which CLT is installed. Design of CLT external wall requires wind barrier with high vapour permeability. Vapour tight thermal insulation requires factory-dry CLT before installation. Hygrothermal criteria as limit values for CLT external wall layers were determined.
Impact of built-in moisture on the design of hygrothermally safe cross-laminated timber external walls: A stochastic approach
https://orcid.org/0000-0001-7792-9035
https://orcid.org/0000-0002-1424-6154
https://orcid.org/0000-0003-1368-4301
Abstract In terms of hygrothermal performance, solid wood panels composed of cross-laminated timber (CLT) are sensitive to moisture. However, to the best of our knowledge, no clear indications of critical initial moisture conditions for CLT envelopes regarding the dry-out of built-in moisture have been provided. Therefore, our main objective was to set critical limit values for CLT external wall design in terms of their initial moisture content (built-in moisture) and dry-out capacity (vapour resistance of wall layers) using a stochastic approach. The focus is on five types of CLT external walls that differ in their dry-out capacity. The key factors in the hygrothermally safe design of the CLT external envelope are sufficient dry-out capacity and control of the CLT initial moisture content level during the construction phase. The results of our stochastic analysis confirmed that a high initial moisture content in CLT causes a high mould growth risk when CLT is covered with vapour tight layers. Therefore, the limit values for critical initial moisture content of CLT and the water vapour resistance of the wall layers that ensure dry-out capacity of different external walls to prevent the risk of mould growth on the CLT surface in a cold and humid climate were determined. These limit values take into consideration the weather conditions during the construction phase and classes of material sensitivity to mould growth.
Highlights Built-in moisture is problematic when dry-out of CLT in external wall is prevented. Favourable conditions for mould vary during the seasons in which CLT is installed. Design of CLT external wall requires wind barrier with high vapour permeability. Vapour tight thermal insulation requires factory-dry CLT before installation. Hygrothermal criteria as limit values for CLT external wall layers were determined.
Impact of built-in moisture on the design of hygrothermally safe cross-laminated timber external walls: A stochastic approach
Kukk, Villu (author) / Kers, Jaan (author) / Kalamees, Targo (author) / Wang, Lin (author) / Ge, Hua (author)
Building and Environment ; 226
2022-10-21
Article (Journal)
Electronic Resource
English
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