When Tokyo-based architectural office UENOA was tasked to design a new office building for structural screws manufacturer SYNEGIC Co., Ltd, the client also asked them to create “advanced architecture that [would] expand the possibilities of wooden structures.” The architects rose to the challenge by experimenting with new ways of using cross-laminated timber (CLT) panels in construction. The result is a sculptural office with a sweeping roof frame built of heavy CLT panels that touches the ground on four sides.

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office building with geometric wood roof lit from within at night

Located in Miyagi prefecture north of Tokyo, the new SYNEGIC office building is oriented north to south and spans 834 square meters across two floors. The ground floor of the hexagonal-shaped building is partitioned into a series of rooms for a variety of functions including meetings, offices, storage, bathrooms and technical equipment. In contrast, the cross-shaped second floor does not have partition walls and comprises an open-plan office, conference room and sample room.

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wood desks under a wooden ceiling
wood stairs leading to a lofted area

The highlight of the project is the massive folded roof with exposed trusses. The architects created the structure by connecting flat laminated timber trusses with widths of 105 millimeters — the typical size for lumber used in Japanese houses — to triangular CLT panels. The use of CLT allowed the architects to take advantage of time-saving prefabrication and avoid on-site hardware joinery. The heavy CLT panels used for the roof have also been used as partition walls for bearing vertical loads on the ground floor. 

wood desk on wood loft under wood-beamed ceiling
aerial view of first-floor office building and loft with exposed wood ceiling beams

“After thoroughly controlling the texture of the CLT surface just like a marble, we are trying to join screws with consideration of design and workability rather than general CLT hardware,” the architects said. “Through these ambitious processes commensurate with the high cost of CLT, it was possible to realize a large CLT wall in the atrium that has no modules and emphasizes the wooden texture more.”


Images by Hiroyuki Hirai via UENOA

side image of office building with gabled roof