PROBLEM TO BE SOLVED: To provide a joint member for coupling double groove type seat stopper, in which a double groove type seat stopper is used, as means for ventilation needed for the air supply and circulation within a vinyl house, cost is aimed at reducing by eliminating any process of providing a vent hole in the sheet stopper, and the joint member is devised to enable the air circulation and air pressure within a vinyl house rationally and well.SOLUTION: The air sent into an insulating air layer A of a vinyl house by an electric fan 17 is refluxed into the vinyl house from the insulating air layer A through a concave portion for degassing 6 of the stopper part 5 in the center position and through a back side space 60 of a joint board 1b of the double groove type seat stopper 1.SELECTED DRAWING: Figure 4【課題】ダブル溝型シート止め材を使用して、ビニルハウス内空気の供給、循環に必要とされる通気を行う手段として、シート止め材に通気孔を設ける加工を一切無用にしてコストダウンを図り、ビニルハウス内空気の循環と空気圧を合理的に良好に実現可能に工夫した、ダブル溝型シート止め材のジョイント部材を提供する。【解決手段】ビニルハウスの断熱空気層Ａへ電動ファン１７で送り込まれた空気は、同断熱空気層Ａから前記中央位置のストッパー部５のエア抜き用凹部６を通じて前記ダブル溝型シート止め材１の繋ぎ板部１ｂの背面側空間６０を経てビニルハウス内へ還流させる。【選択図】 図４
