Ceiling As with other elements of minka design, ceilings varied according to location, occupation and economic status of the household. In some cases there was no ceiling as such, with open space reaching the underside of the roof. This was particularly true above the doma . In households where silkworms were raised on the second floor, it was not uncommon to have bamboo ceilings with joined beams. This allowed for the circulation of warm air from fireplaces below.
Smoke rising through the ceiling is said to have helped to preserve the thatched roof.
The ceiling of the Nationality Room adopts this style. Walls Wall surfaces varied according to region and available materials. Generally, the surface was mud plaster applied over a bamboo lattice. In some circumstances, walls were made of wooden boards, thatch or a combination of wood and mud plaster. The Nation ality Room mimics mud plaster walls through the use of textured wallpaper and uses wooden wainscoting for greater durability.