The user inputs the desired building specifications within a grid of points into the ClipHut programming software and then specifies the geographic location and the intended use of the building. The ClipHut parametric model produces shop-drawings for a kit of parts in response to the particular needs of the user. The output is a structural grid configuration with components sized to meet local building code requirements.

The scale of the module, integrated numbering system and simple connections allow for easy assembly by even a layperson with limited construction experience. ClipHut buildings are also easily disassembled and reused. In an era when sustainability is one of the key requirements for construction, the ability to reuse the building parts significantly reduces waste and improves the environmental footprint of the building.

Innovative ideas shared openly

ClipHut received the Open Source Wood Award with the panel of experts praising its flexibility and innovative structural system that enables faster construction.

“We started out  researching wood joints and in the end developed a building system. The system respects the properties of the wood material and optimizes its use”, explains the ClipHut team in their Open Source Wood submission.

The Open Source Wood Initiative by Metsä Wood is a collaborative online platform for architects and engineers to share their innovative ideas for modular wood construction. Users can upload their projects and concepts on the platform for feedback and collaboration opportunities. Metsä Wood’s experts evaluate the submissions and awards are given to the most innovative ideas, like ClipHut.

 “ClipHut is the first idea I have seen where a handful of pieces could be used to construct almost any building shape. The use of plug-in connections between prefabricated components can offer fast installation on-site”, says Jussi Björman, Director of Technical Customer Service at Metsä Wood. 

“We can see how sustainability is part of the Metsä Wood's mindset,” says Thomaz Viera, the system developer of ClipHut. “If we want to develop construction industry in an increasingly environmentally conscious direction, we shouldn't only invent better products. We also have to invest in a decentralized production and distribution chain, reducing our ecological footprint, increasing productivity and investing in mass customization solutions.”

Working with small-scale, lightweight Kerto LVL frames for a rigid structure

The loads acting on the structure are transferred through a series of small-scale framing layers, with each layer measuring approximately 1 metre. All of the components are precisely cut using a CNC milling machine to the specifications from the ClipHut parametric model. The original prototype was constructed from OSB (oriented strand board) to test the parameters of the system. The team sees Kerto LVL as a particularly suitable building material for ClipHut houses, because of its higher strength and superior strength-to-weight ratio, making the assembled structure extremely stable.

“Kerto LVL is of a high quality; it is tight and also stiffer than OSB and consequently the joints are able to hold more loads, allowing a bigger span between columns and reducing the need for material in some cases,” explains Viera. “Other advantages are the possibility to build higher or even add more floors to the building and also extend its life time.”