ction process is far less likely to be interrupted in bad weather conditions. Stephen Powney notes in Timber and Sustainable Building Magazine that, despite the transport, carbon saving over steel and concrete was 2113 tonnes; the amount of sequestered carbon is the equivalent saving to providing 20 per cent of the building's energy requirement in use for 139 years . The building was completed in October 2011. Probert noted that CLT was becoming very competitive with UK construction companies, partly due to the carbon sequestration in the structures.
4.3. CLT Building 3: Svartlamoen Multi-Apartment Building in Trondheim, Norway
This development (architects: Brendeland and Kristoffersen, Trondheim, 2005) consists of two buildings with an overall area of around 1000 sqm . The main five-storey building, which measures 6 m × 22 m, also contains rooms that can be used commercially, and the four upper floors contain units of 120 sqm designed to accommodate 5 persons each. The entire construction was made out of solid CLT boards and clad with Norwegian larch. The untreated timber surfaces of the load-bearing elements are exposed on the inside (see Figure 5). The use of prefabricated elements reduced total construction time significantly (9 months, about half the usual time). The efficient assembly of the timber elements allowed four workers to erect the main structure in just 10 working days. This project has provided student housing and was selected through a design competition set up by the city municipality, drawing on grants from the central government for sustainable and innovative buildings. The building was controversial and one of the architects (Brendeland) commented that ‘the day the Svartlamoen housing block was opened, concrete companies took out a full-page advert in the city newspaper showing a blazing timber building, a scare tactic focusing in on timber’s fire risks’ . The following Figure 5 and Figure 6 introduce some of the occupants of the selected cases. A post-occupancy evaluation for the building in Trondheim is currently underway. In April 2012, the author met with residents Mats and Hella to discuss their lifestyle choices. He learnt that there is now a long waiting list of students to move into this building; it has become very popular to be associated with this green building. The occupants mentioned that they like the idea that the building materials are recyclable and all tenants are conscious of the sustainability of the building, appreciating its particular ‘timber qualities’, for example the healthy indoor climate.
4.4. CLT Building 4: Am Muehlweg Complex, Vienna-Floridsdorf
The Am Muehlweg project was designed by Hubert Riess, Dietrich and Untertrifaller, and the construction cooperative Hermann and Johannes Kaufmann architects. One hundred public-sector apartments were built on each of three interconnecting plots, with the emphasis on the optimum exploitation of the ecological and economic benefits of timber and mixed constructions. Terraced houses and an L-shaped building surround an internal courtyard, creating a communal area. In total, the project provides 6750 sqm in 70 dwellings in 13 buildings (a detailed description of the project is in Kaufmann and Nerdinger ). The three-storey structures made from prefabricated CLT panels built on top of a concrete base were constructed in 15 months. The four-storey buildings offer two different solutions. The north-south-oriented terraced concept, with its maisonettes, has a two-storey timber construction on the second floor erected on top of a ceiling of reinforced concrete. The three-storey structures made from CLT elements are built on top of the concrete base of the east-west-oriented units (see Figure 6 and Figure 7 for images of the project). The entire four storeys of the building are clad in larch. An obligatory fire protection belt was included in the development’s design. Lattke and Lehmann  note that a major success of the project was the cooperative working relationships between planners and representatives of the public authorities, who d