Abstract: A method of joining narrow waterproof sheets to obtain a waterproof sheet of wide width having a gently curved joint which is free from any acutely stepped portion. It comprises disposing a cure tape between the overlapping edge portions of the sheets to be joined, positioning a piece of cushiony material below or above the overlapping edge portions, and heating the overlapping edge portions and the cure tape under pressure. The cure tape has a width which is substantially equal to that of the overlapping edge portions before pressure is applied thereto. When pressure is applied, the cure tape projects in opposite directions beyond the extremities of the overlapping edge portions. One form of the joint thus formed is flat on one surface and gently curved on the other surface, while another form is gently curved on both surfaces thereof.

Abstract: A method of constructing a heat-insulating and water-proof structure by employing a plurality of heat-insulating members utilizes a water-proof membrane which includes a plurality of membrane sections which are connected together and provided in a roll form. A first water-proof membrane section is placed over a heat-insulating member, and one longitudinal edge of the water-proof membrane section is bent about one longitudinal edge of the heat-insulating member and secured to a base surface. A second heat-insulating member is then laid on the base surface next to the first heat-insulating member so that the one longitudinal edge of the first water-proof membrane section is held between the first and second heat-insulating members. A second water-proof membrane section is placed over the second member, and one longitudinal edge of the second membrane section is bent and secured to the base surface, and this process is continued until the entire heat-insulating and water-proof structure is constructed.

Abstract: A method of constructing a heat-insulating and water-proof structure by employing a plurality of heat-insulating members and a plurality of water-proof membranes. A first water-proof membrane is placed over a heat-insulating member, and one longitudinal edge of the water-proof membrane is bent about one longitudinal edge of the first heat-insulating member and secured to a base surface. A second heat-insulating member is then laid on the base surface next to the first heat insulating member so that the one longitudinal edge of the first water-proof membrane is held between the first and second heat-insulating members. A second water-proof membrane is placed over the second member and one longitudinal edge thereof is bent and secured to the base surface. The other longitudinal edge of the second water-proof membrane is joined to the first water-proof membrane.

Abstract: A method for joining waterproof vulcanized synthetic rubber sheets is described wherein a cold-vulcanizable adhesive tape having Mooney viscosity [ML.sub.1+5 (100.degree. C.)] of from 5 to 25 and an autoadhesion property, and which contains a rubbery polymer comprising (1) ethylene-propylene terpolymer, butyl rubber, or a blend of ethylene-propylene terpolymer and butyl rubber, (2) a vulcanizing agent, (3) a vulcanization accelerator, (4) an adhesive agent, and (5) a softening agent is placed between overlapped areas of the waterproof vulcanized synthetic rubber sheets, and said adhesive tape is cold-vulcanized to thereby join the sheets.

Abstract: A method of joining narrow waterproof sheets to obtain a waterproof sheet of wide width having a gently curved joint which is free from any acutely stepped portion. It comprises disposing a cure tape between the overlapping edge portions of the sheets to be joined, positioning a piece of cushiony material below or above the overlapping edge portions, and heating the overlapping edge portions and the cure tape under pressure. The cure tape has a width which is substantially equal to that of the overlapping edge portions before pressure is applied thereto. When pressure is applied, the cure tape projects in opposite directions beyond the extremities of the overlapping edge portions. One form of the joint thus formed is flat on one surface and gently curved on the other surface, while another form is gently curved on both surfaces thereof.