The One Tonne Life project has ended and the content on this web page is static and is not updated any more. The project was unique and pioneering, making the conclusions and all information connected to the project just as interesting and up-to-date today as when it was run. Read more about the project and get inspired! (March 2017)

One Tonne Life

Tag: Derome

From forest to finished house – part 3: the house factory

In 1960 Derome supplemented its sawmill business with building material sales. Today the company supplies construction materials and prefabricated building components as well as complete houses under the A-hus and Varbergshus brands. The A-hus brand covers prefabricated houses that can be picked straight from the catalogue, with the focus on design. In addition to sales in Sweden, these houses are also exported to the Netherlands, Belgium, Germany and Denmark.

The factory in which they are built is located at the very same site where the company was founded. Production is highly rationalised. A CAD system generates core data files with information for the production line, which uses the drawings to produce the houses. Every year, A-hus builds and sells 350 houses, that is to say about one a day. The Lindell family went to have a look at the house factory.

The family examine the production line together with Petra Cederhed of A-hus (on the right)…

…and Peter Mossbrant, President of A-hus (on the left).

Christian Axelsson of A-hus in discussion with Alicja about the plastic sheeting that serves as the “climate shell” of the One Tonne Life house.

Cross-section of a One Tonne Life wall, with the plastic sheeting inserted in two layers.

Hannah inspects the growth rings in the timber used for the facade.

The house walls are insulated.

Jonathan got to apply insulation strips to a window. He managed it well …

…as did Nils.

When the time came to try the nail gun, Jonathan focused on looking as cool as possible …

…while Hannah went all-out for enthusiasm …

…but wasn’t quite ready for the recoil!

Hannah shows the nails used in the nail gun.

Hannah watches as a window receives its final insulation treatment. This is the last step before …

…the module is ready.

From forest to finished house – part 1: the sawmill

While the Lindells were in Göteborg they took the opportunity drive south to Anneberg outside Kungsbacka, where A-hus has its production facilities. A-hus is part of the Derome Group, which traces its roots to 1947 when Karl Andersson started the first sawmill in Derome in the province of Halland. Today the Derome Group is Sweden’s largest family-owned wood processing operation. Here at we touch base three times and follow the family on their visit to the sawmill and the factory that builds the houses.

The lumber is transported to a depot outside the building …

…and carried on a conveyor into the sawmill.

Inside the sawmill A-hus President Peter Mossbrant (standing between Alicja and Nils) spoke with enthusiasm about how sawn tree-trunks become ready-to-use timber.

The lumber enters the sawmill …

…and the sorting process begins. In his blog following the family’s visit, Nils writes about his fascination with the technology he saw at the mill. Mechanical old-school handling with toothed wheels blends with ultra-modern laser technology that calculates how each piece of lumber is to be cut to ensure minimum material waste.

The noise level in the sawmill is high and everyone had to use ear defenders inside the premises. Peter Mossbrant explains the sorting process to Hannah.

The lumber has now been transformed into timber.

Jonathan was very interested …

…as was Alicja…

…who is examining the final sorting process.

The finished timber is stacked outside the sawmill.

From forest to finished house – part 2: Biofuel

The Derome Group specialises in the wood processing operations and together with its subsidiary A-hus has a very strong pro-environmental profile. In addition to building low-energy homes such as the One Tonne Life house, the company also works in the following areas:

Wood – lobbies for increased use of wood in construction (as a building material wood is 10 times more climate-friendly than concrete)

Bio-energy – supplies biofuels (see below)

Solar heating – uses solar energy systems

Wind power – meeting all its electricity needs by 2012

Energy efficiency enhancement – to reduce consumption in production

Forestry – helps forest owners migrate to environmentally optimised forestry methods

During the Lindell family’s visit, Jonathan and A-hus President Peter Mossbrant size up the mountain of wood shavings produced by the sawmill.

Peter explains how the wood shavings from the sawmill are compressed to form pellets that can be used as fuel in the boiler.

Hannah, on the other hand, put the wood shavings to good use, improving her tan in the spring sunshine.

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