REINFORCING SHEET FOR IMPERVIOUS SHEET

PROBLEM TO BE SOLVED: To provide a reinforcing sheet for an impervious sheet capable of completely preventing the leakage of the sewage occurring in plunging of sharp materials to the impervious sheet. SOLUTION: The reinforcing sheet 1 is formed by laminating a nonwoven fabric 2 made of polyester and an expansion crosslinked polyethylene (PE) sheet 3. The lamination surfaces of the nonwoven fabric 2 and the expansion crosslinked PE sheet 3 are melt adhered by a PE 4. A tacky adhesive layer 5 consisting of a tacky adhesive material is laminated on the surface of the expansion crosslinked PE sheet 3 not adhered to the nonwoven fabric 2. Release paper 14 is affixed to the outer flanks of the tacky adhesive layer 5. Such reinforcing sheet 1 is used as the reinforcing material for the impervious sheet by affixing the same to the front surface of the impervious sheet by utilizing the tacky adhesive power of the tacky adhesive layer 5 in the seepage control work, etc., of a waste disposal plant.