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Abstract
This paper deals with recent advances in roof membranes in Japan from the viewpoint of the design conception and improving performance. The conventional hot-applied built-up bituminous membrane has been generally improved by the use of bituminous felts made with synthetic fiber base, in addition to an introduction of the spot-bonded system with perforated felts. It is also improved on movement capability and productivity by introducing base sheets made of rubber. In order to eliminate site-melting of bitumen, two types of membranes are developed; one is with bituminous felts with self-adhesive layer, and the other is with site-applied adhesive. The torching system also has been introduced for the same purpose. The watertight performance at lapped joints in the sheet-applied membrane can be improved by laminating two sheets. Several single-ply sheet-applied systems have recently been developed; mechanically attached and a system with stainless steel sheets. Combination of the sheet- and liquid-applied systems improves inherent weak points in each system: the watertightness in lapped joints in the sheet-applied system, and the uniformity of the liquid-applied membranes and their resistance against indentation. The use of a base sheet, which has a grooved pattern on the underside surface for venting, is very effective in improving the capability of liquid-applied membranes and preventing them from blistering. Specially formulated fiber mats also are used for the same purpose as the base sheet with venting groves.
This paper deals with recent advances in roof membranes in Japan from the viewpoint of the design conception and improving performance. The conventional hot-applied built-up bituminous membrane has been generally improved by the use of bituminous felts made with synthetic fiber base, in addition to an introduction of the spot-bonded system with perforated felts. It is also improved on movement capability and productivity by introducing base sheets made of rubber. In order to eliminate site-melting of bitumen, two types of membranes are developed; one is with bituminous felts with self-adhesive layer, and the other is with site-applied adhesive. The torching system also has been introduced for the same purpose. The watertight performance at lapped joints in the sheet-applied membrane can be improved by laminating two sheets. Several single-ply sheet-applied systems have recently been developed; mechanically attached and a system with stainless steel sheets. Combination of the sheet- and liquid-applied systems improves inherent weak points in each system: the watertightness in lapped joints in the sheet-applied system, and the uniformity of the liquid-applied membranes and their resistance against indentation. The use of a base sheet, which has a grooved pattern on the underside surface for venting, is very effective in improving the capability of liquid-applied membranes and preventing them from blistering. Specially formulated fiber mats also are used for the same purpose as the base sheet with venting groves.
Date
0/1988
0/1988
Author(s)
Michio Koike
Michio Koike
Page(s)
1-17
1-17
Source
Society of Chemical Industry
Society of Chemical Industry
Keyword(s)
Japan; design concept; performance; advances; sheet-applied; liquid-applied;
Japan; design concept; performance; advances; sheet-applied; liquid-applied;