Abstract
The paper deals with the present state of the art of roofing technology, including a brief historical review and future trends, in the Far East. In Japan, the market share of roof coverings for pitched roofs is as follows: clay and pressed cement tile, 55 percent; metal sheet, 25 percent; and asbestos cement shingle and sheet, 20 percent. The market share for membrane systems for flat roofs is: built-up system using roofing felt of synthetic fiber base, 55 percent to 60 percent; sheet-applied, 20 percent to 25 percent, which consists of rubber sheet, 75 percent; PVC sheet, 20 percent, and modified bituminous sheet, 5 percent; liquid-applied system, mainly two-part polyurethane, 15 percent to 20 percent. Among these, architects and engineers have relied mostly on the built-up system. In other countries, several types of sheet-applied systems have been introduced from the U.S. and Europe in recent years, in addition to the conventional built-up system used before. They are rubber and plastic sheets, polyethylene film laminated with a thick self-adhesive layer, and sheets of modified bitumen for the torch method. They might be used depending on the countries where architects or engineers studied or where the owners or contractors live.
The paper deals with the present state of the art of roofing technology, including a brief historical review and future trends, in the Far East. In Japan, the market share of roof coverings for pitched roofs is as follows: clay and pressed cement tile, 55 percent; metal sheet, 25 percent; and asbestos cement shingle and sheet, 20 percent. The market share for membrane systems for flat roofs is: built-up system using roofing felt of synthetic fiber base, 55 percent to 60 percent; sheet-applied, 20 percent to 25 percent, which consists of rubber sheet, 75 percent; PVC sheet, 20 percent, and modified bituminous sheet, 5 percent; liquid-applied system, mainly two-part polyurethane, 15 percent to 20 percent. Among these, architects and engineers have relied mostly on the built-up system. In other countries, several types of sheet-applied systems have been introduced from the U.S. and Europe in recent years, in addition to the conventional built-up system used before. They are rubber and plastic sheets, polyethylene film laminated with a thick self-adhesive layer, and sheets of modified bitumen for the torch method. They might be used depending on the countries where architects or engineers studied or where the owners or contractors live.
Date
0/1985
0/1985
Author(s)
Michio Koike
Michio Koike
Page(s)
9-13
9-13
Keyword(s)
Far East; roofing technology
Far East; roofing technology