WATERPROOF CONSTRUCTION OF ROOF CHIMNEY PENETRATION PART: Fid-Bau Portal

WATERPROOF CONSTRUCTION OF ROOF CHIMNEY PENETRATION PART

UENO SHOICHI

To provide waterproof construction of a roof chimney penetration part used with an inner draining member in which dew condensation water is not easily accumulated in the closed portion of an opening.SOLUTION: Waterproof construction 1A of the roof chimney penetration part comprises an outer draining member 30 having a water guide plate 31 and a peripheral wall 32 and an inner draining member 20 having a fixed plate 21 and a peripheral wall 22, in which the inner draining member 20 is fixed to seal fluid circulation at a lower face side of the fixed plate 21 except an eaves side prescribed range and thereby preventing penetration of rain water to an opening 12. A ventilation member 25A is composed of a fine hole plate 250 forming a communication passage 250a between diaphragms by making diaphragms connecting two pieces of sheet material from one end side to other end side become a corrugated cardboard shape side by side at prescribed interval at the eaves side prescribed range of the undersurface of the fixed plate 21. The ventilation member 25A is provided between the undersurface of the fixed plate 21 and a top face of a waterproof sheet 11 and ventilates indoor and outdoor while draining dew condensation water accumulated at the undersurface of the fixed plate 21 to an eaves side through the communication passage 250a.SELECTED DRAWING: Figure 1

【課題】内部水切り部材を用いた屋根煙突貫通部の防水構造について、開口部の閉鎖箇所に結露水が溜まりにくいものとする。【解決手段】導水板３１及び周壁３２を有する外部水切り部材３０と固定板２１及び周壁２２を有する内部水切り部材２０とで構成され、内部水切り部材２０が固定板２１の軒側所定範囲を除いて固定板２１下面側で液体の流通を封止するように固定されて雨水の開口部１２への侵入を防止する屋根煙突貫通部の防水構造１Ａであり、固定板２１下面の軒側所定範囲に、２枚のシート材を一端側から他端側に亘って接続する隔壁が所定間隔で並列して段ボール状とされて隔壁間に連通路２５０ａを形成した細孔板２５０からなる通気部材２５Ａが、固定板２１下面と防水シート１１上面に挟まれた状態で設けられ、連通路２５０ａを介して固定板２１下面に溜まった結露水を軒側に排出しながら屋内外の通気を行うものとした。【選択図】図１

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