A review of high R-value wood framed and composite wood wall technologies using advanced insulation techniques

Author

JanKosnyaAndiAsizbIanSmithcSomShresthadAliFallahia

a

Fraunhofer CSE, Boston, MA, USA

b

Prince Mohammad Bin Fahd University, Saudi Arabia

c

University of New Brunswick, Fredericton, Canada

d

Oak Ridge National Laboratory, Oak Ridge, TN, USA

Received 19 August 2013, Revised 26 December 2013, Accepted 2 January 2014, Available online 15 January 2014.

Highlights

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To indentify advanced wood wall assemblies for residential and small commercial buildings.

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To review existing and past practices in residential and commercial wood wall constructions.

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To identify framing, insulation, and architectural details minimizing thermal bridge effects.

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To review wall structural integrity, fire safety, and acoustic performance.

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High performance wall technologies from Europe and North America are considered.

Abstract

The main objective of this study is to indentify advanced wall frame assemblies applicable for residential and small commercial buildings, that have or could reach R-values larger than RSI – 3.5 m2 K/W (U-value lower from 0.29). An extensive literature review of existing and past practices is used as the main vehicle to analyze: framing and wall insulation methods, architectural details with focus on minimizing thermal bridges, structural adequacy aspects with respect to gravity and lateral loads, and ability to provide fire and sound breaks. In this paper a wide selection of advance framing wall assemblies is discussed in details with main focus on construction methods, architectural details with minimized thermal bridges, and structural (strength) concerns. High performance wall technologies of consideration include: double walls, Larsen truss walls, optimum or advanced framing walls, walls using distance spacers (furring) and walls made of wood-based composites. Since wood framing for wall applications is mostly used in North America, Scandinavia, and Central Europe, this study is focused on research studies from these regions. In addition, field test studies are presented discussing an application of high R-value of new and retrofitted wall assemblies in actual test houses that have been constructed and being currently monitored.

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http://www.sciencedirect.com/science/article/pii/S0378778814000279