The Japanese art of timber framing is known as 宮大工 (Miyadaiku), which literally means temple carpentry. Due the natural abundance of trees and high humidity that rusts nails, Japan has a long tradition of timber framing.
Traditionally, 荒土壁 (aratsuchikabe), that is walls of bamboo and mud plaster, are built between posts. Junya checks out the plaster mixing station: trough, mud, chopped straw.
As commercial building materials become the norm, traditional timber framing is not being included in modern building codes. Mr. UEDA is a member of a study group that actually runs experiments to provide data to building officials.