Moisture Safety of Wooden Buildings – Design, Construction and Operation

Mjörnell, Kristina; Olsson, Lars E.

doi:10.5755/j01.sace.24.1.23230

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…Additionally, moisture content affects the strength and stiffness of the wood, making it important to ensure that the wood is not too dry or too wet. Therefore, controlling the moisture content of timber elements is an important aspect in ensuring the long-term durability and safety of the structure [21]. Structural timber has varying MC values depending on the design and atmospheric conditions.…”

Section: The Dimensional Change Of Timbermentioning

confidence: 99%

Moisture-induced timber joining - Utilizing the hygroscopicity and shape-memory effect of wood resulting in dimensional change in a prefabricated wood-only, self-built, sawn timber system for affordable housing in Colombia

Salzberger,

Rojas,

Koskamp

2024

Preprint

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From a global perspective, the building industry stands as a significant factor of environmental impact on the planet. Wood has emerged as a promising construction material as a sustainable building source, gaining traction in the industry due to its carbon storage capabilities and prefabricated possibilities [13]. Particularly in the context of rural Colombia, the integration of prefabricated timber constructions, coupled with advancements in digital fabrication technologies, holds the promise of facilitating social reconstruction. Furthermore, such an approach poses the potential to enhance material performance and contribute positively to its end of life [1]. Nevertheless, existing research identifies a critical gap within the wood-to-wood timber connections to tackle better design, manufacture, assembly, and deconstruction (DfMA + D) [20]. Consequently, this study endeavours to explore the application of Computer Numerical Control (CNC) technologies in conjunction with the material's response to changes in relative humidity. The aim is to devise a mechanism for tight-fitting structural wood connections, the central focus of this research lies in understanding the collaborative interaction between sawn timber and moisture fluctuations. By doing so, the study seeks to introduce a new construction methodology and building system centred around material climate reaction and its expansion capacity applications in traditional connections, thereby mitigating the need for chemical and mechanical structural joints, ultimately resulting in a self-assembly system destined to low-income populations in the Colombian territory. This study proves the enhancement of timber connection to tensile stress up to 50% of its original capacity by implementing the moisture induced process and developing a building system utilising this joining method for the assembly of elements for housing in Colombia.

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Section: The Dimensional Change Of Timbermentioning

confidence: 99%

Moisture-induced timber joining - Utilizing the hygroscopicity and shape-memory effect of wood resulting in dimensional change in a prefabricated wood-only, self-built, sawn timber system for affordable housing in Colombia

Salzberger,

Rojas,

Koskamp

2024

Preprint

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“…These approaches show potential to use also other species than spruce. New technologies such as CLT (cross laminated timber) have accelerated the construction of multi-story wooden buildings and weather protection during construction has not always been used but moisture safety remains important (Mjörnell and Olsson, 2019).…”

Section: Durability Challenges For Clt (Cross Laminated Timber)mentioning

confidence: 99%

Innovative Approaches to Increase Service Life of Poplar Lightweight Hardwood Construction Products

Acker¹,

Jiang²,

Bulcke³

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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During the second half of last century the forestry-wood chain has evolved and today ecosystem services in a sustainability framework are important. Forests are intended to provide services for the bio-economy, human health, biodiversity and climate control. An increased need for more renewable resources both for material and energy use has initiated extra interest for the potential to produce more lignocellulosic biomass, in short to increase wood production. One option is to provide in complementary production in planted forests. Both forestry and agriculture can take part in this. The cultivation of poplar hybrids in the temperate regions is a key option for the current and future bioeconomy. These fast-growing trees are producing lightweight hardwood with a low natural durability, but with an important potential as construction material especially as engineered wood products. All wood protection methods are of interest to be evaluated for this wood resource, making it suitable even for high quality applications. Poplar, for many reasons, has been nominated as hardwood with the best potential to perform similarly as softwoods for applications in wood construction. Benchmarking with wood species like spruce is relevant for several engineered wood products like plywood, LVL and even CLT. Wood treatments to increase durability have evolved from traditional wood preservation towards modification techniques such as thermally modified timber. Innovative poplar based products have been assessed on their performance and are designed to fit for purpose in relation to a specific combination of use class and service life. Introducing innovative poplar based construction product for green building requires adequate testing tools. Performance based assessment should allow to integrate different protective measures. Related to moisture dynamics and the linked fungal decay risk, opportunities to extend service life are manifold. Treatment can be differentiated e.g. for cladding (building envelope) and loadbearing construction components. Simple or sophisticated modification processes can alter the equilibrium moisture content. The use of wood based panels and new engineered wood products allow for better moisture control impacting fungal decay risk, but also alter the probability of insect damage. This paper intends to present several innovative poplar based construction products and show some cases of benchmarking in relation to an integrated service life approach.

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“…The best strategy for providing a moisture-resistant structure is to ensure that the wood is not exposed to water or high relative humidity for extended periods. Neglecting moisture safety can mean a high risk of damage, with extensive costs and consequent time delays for research, decontamination, or material replacement [78].…”

Section: Introductionmentioning

confidence: 99%

Wooden Additional Floor in Finland

2022

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One of the most effective ways to cover real estate development and renovation processes by improving functionality and energy efficiency is wooden additional floor construction. This entry maps out, organizes, and collates scattered information on the current state of the art and the benefits of this practice including its different stages, focusing on the case of Finland. The entry presents this topic in an accessible and understandable discourse for non-technical readers. By highlighting the benefits and opportunities of this sustainable application, the entry will contribute to increasing the awareness of wooden additional floor construction, which has many advantages, and therefore to gain more widespread use in Finland and other countries.

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Moisture Safety of Wooden Buildings – Design, Construction and Operation

Cited by 10 publications

References 2 publications

Moisture-induced timber joining - Utilizing the hygroscopicity and shape-memory effect of wood resulting in dimensional change in a prefabricated wood-only, self-built, sawn timber system for affordable housing in Colombia

Moisture-induced timber joining - Utilizing the hygroscopicity and shape-memory effect of wood resulting in dimensional change in a prefabricated wood-only, self-built, sawn timber system for affordable housing in Colombia

Innovative Approaches to Increase Service Life of Poplar Lightweight Hardwood Construction Products

Wooden Additional Floor in Finland

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