“The atrium is always warmer than the offices, which open on to it,” says Bucholz. “When the external temperature goes above 15℃, the chimney exhaust is activated. Even when it is less than 5℃ outside, the atrium can be quite warm – so then it becomes the supply air source. The system really proved itself in 2010,” he says. “When temperatures dropped to below zero for three weeks, the gas boiler also broke down, so there was no heating. The temperature was minus 10℃ at night and minus 8 or 9℃ during the day, but there was a lot of sunshine. They simply closed the windows and used the sun’s energy to heat the building. The internal temperature never dropped below 18℃. We’re doing a building in Canada right now – for Toronto and Region Conservation – that uses the same idea. Dooradoyle was the first time we did it.”
The Dooradoyle brief called for a 100-year design life. “Most of the materials were chosen because they are extremely hard-wearing,” says Bucholz. “There are EQUITONE fibre cement façade panels on the gables and rear of the building. It’s like rock armour and has suffered from no UV colour degradation.”
There is a dynamic quality to the brise-soleil that shields the atrium from the heat of the day. When you walk around, it shimmers and responds – as if agitated into movement – taking on different appearances. It’s a herringbone tapestry, a Gothic veil, a pleated Issey Miyake fabric stretched over the building. Elegantly formed in a series of 25 bowed trusses, each 15 metres tall, it is pleated to catch both the high southern rays and low western beams. In the atrium, you only have to move your head. Look up, into the swelling sail of a racing yacht. Look east and you see overlapping slanted lines of dense shading. To the west is a corps de ballet, twisting in sequence to face you, some turned at the waist, others at the ankles. On your way to the council chamber’s public gallery and restaurant you pass beneath the screen, towering like the hull of a ship floating overhead. Looking back from outside, the entire structure dances along sprightly, a lively chorus line balanced atop impossibly slender legs.
Bucholz waxes lyrical about wood, and mentions visiting the stave churches of Norway, many dating from the 12th and 13th centuries: “That’s a very harsh environment but a lot of the original wood is still there. We have a strange perception about how timber performs in our weather. The reality is that wood will last longer than anything but stone. Way better than aluminium or steel. The timber structure here is bullet-proof. You don’t have to maintain it. All the surfaces are angled at 45 degrees. It’s amazing how robust it is when correctly detailed. The timber is glue-laminated, pressure-impregnated Scots pine – a very special wood, but not an exotic one. It will still be there in 100 years,” he says.