On our visit last Thursday, we noticed that our carpenters had started covering the ceilings with plasterboard. This is called "Sekkou Bo-do" (石膏ボード / せっこうボード) in Japanese. It goes by various other names such as Drywall, Wallboard or Gyproc (in Quebec).
This particular plasterboard is manufactured by Yoshino and goes by the name of タイガーボード (Tiger Board). Plasterboard basically consists of layers of paper that has been bonded to a gypsum plastered core; it is a noncombustible material that is used mainly in the construction of walls and ceilings. According to Yoshino's website, gypsum is extracted in one of their mines in Yamagata prefecture.
One of the key features of Yoshino's Tiger Board is its capacity to rapidly absorb and decompose formaldehyde emitted from building materials in newly-built houses. Sounds good!
We happened to be there when Fukuzumi-san was cutting and installing the plasterboard surrounding the circular-shaped reclined ceiling in the entrance. Not an easy task, but we could tell this wasn't his first time doing this type of detail.
1. First cut the board to fit the area and secure it lightly.
2. Then, using a pencil trace out the circular shape from the inside
3. Remove board and cut it manually along pencil tracing
4. Secure the board along beams using screw gun
The thickness of the Plaster Board placed on the ceiling
is 9.5mm, and that placed on the walls is 12.5mm.
The automatic Dry Wall Screw Gun our carpenters use facilitate the job tremendously.
Given that a large amount of Plasterboard remains unused and must be discarded after construction, it is good to know that Yoshino's products can be recycled.
After applying plasterboard, joints need to be strengthened with special jointing compound (putty) and tools. After that, the wall can be finished with either paint or wallpaper. We'll try to visit the site when they apply the putty to the walls and ceilings.
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