Preservation water mat null for roof greening

摘要

PROBLEM TO BE SOLVED: To obtain the subject water holding mat capable of sufficiently holding water necessary for the growth of a plant and preventing the plant from a root rot by forming a specific water-holding grooves on the upper surface of a mat made from a synthetic resin. SOLUTION: This water holding mat for greening a rooftop is obtained by forming plural rows of not continuing water holding grooves 2 having a prescribed length in parallel by leaving a flat part 3 having a prescribed area. In this case, it is preferable that the amount of holding water of the water- holding grooves is within 2-6 litter range per 1 m2 mat, and the water-holding grooves can be installed by arranging them as a zigzag state by a horizontal view. The water-holding mat 1 having such waterholding grooves 2 can be produced e.g. by a heat molding such as a vacuum molding, a compressed air molding, etc., of a synthetic resin sheet. As the synthetic resin, although there is no particular limitation, a vinyl chloride resin, a polyethylene resin, a polypropylene resin, etc., can be cited.