WATER-PROOF MATERIAL FOR CONSTRUCTION

PURPOSE:To obtain a material with desired mechanical strength as well as a combination of water proof and permeability by forming a laminate sheet- shaped or tape-shaped with a number of fine porosities, as a base material. CONSTITUTION:A thermal-adhesion (low-melting-point) porous sheet 2 and a permeable reinforcing material 3 are laminated in sequence on the upper face of a porous sheet 1. Adhesive portions 4 are formed in stripes on both side edges of the lower face of the porous sheet 1. In this case, for the synthetic resin composition of the porous sheet 1, linear low-density polyethylene resin as polyolefin group resin is used to mix with EPDM., softener and filler, and made into grains after sufficient agitation and mixture. For the synthetic resin composition of the low-melting-point sheet 2, ethylene-vinyl-acetate copolymer resin as low-melting-point resin for which adhesive property is developed by heating is sufficiently agitated and mixed with calcium carbonate and made into grains. Two types of resin compositions different in a melting point are extruded by a two-layer extruder to obtain a laminate formed of a polyolefin group resin sheet and a thermal-adhesion low-melting-point resin sheet. This laminate is uniaxial-oriented by a tenter or biaxial-oriented.