RENOVATION ROOFING MATERIAL OF EXISTING ROOF AND CONSTRUCTION STRUCTURE USING THE SAME

To average the flow rate of rainwater in a renovation roofing material that is constructed by covering an existing thin plate-shaped roofing material that is stacked in the direction of eaves in a staircase pattern.SOLUTION: In a renovation roofing material 100, a ridge side insertion portion 130, a decorative surface portion 110, and an eaves side folded portion 120 are integrally formed, and the decorative surface portion 110 is formed with water flow control means. As an example of the water flow control means, a recess is formed in the decorative surface portion 110 along a substantially vertical direction in the eaves building direction. Further, this recess is formed in a bellows-folded shape (repeated shape of mountain folds and valley folds) including at least two slopes, an eaves-side slope and a ridge-side slope. An inclination angle β (deg) of the eaves-side slope is less than a roof gradient α (deg) of the existing roof.SELECTED DRAWING: Figure 2 【課題】軒棟方向に階段状に重ねられて施工された薄板形状の既設屋根材を覆って施工される改修用屋根材における雨水の流量を平均化させる。【解決手段】改修用屋根材１００は、棟側差し込み部１３０と化粧面部１１０と軒側折り返し部１２０とが一体的に形成され、化粧面部１１０に流水制御手段が形成されている。そして、この流水制御手段の一例として、化粧面部１１０に軒棟方向の略垂直方向に沿った凹部が形成されている。さらに、この凹部は、少なくとも軒側斜面および棟側斜面の２つの斜面を含む蛇腹折り形状（山折れと谷折れとの繰り返し形状）により形成され、軒側斜面の傾斜角度β（ｄｅｇ）は、既存屋根の屋根勾配α（ｄｅｇ）未満である。【選択図】図２