System for fastening sheet materials together

An acoustical barrier adapted to be mounted to a barrier wall, the acoustical barrier comprising:

• first and second mat portions mounted to each other in overlapping relationship, each mat portion being of a molded construction and having sound dampening characteristics with an inner surface adapted to face the barrier wall and an outer surface adapted to face away from the barrier wall;
• the first and second mat portions each having a terminal edge and an integrally molded channel extending adjacent the terminal edge;
• the channel of the second mat portion being received within the channel of the first mat portion to thereby mutually align the first and second mat portions when mounting the mat portions together;
• a hollow boss is formed at the bottom of the channel at the first mat portion, the hollow boss including an aperture extending therethrough between the inner and outer surfaces of the first mat portion;
• and
• a fastener having a stud and a head formed at one end thereof;
• the head being positioned within the hollow boss and in contact with the inner surface of the first mat portion, the stud extending through the aperture and into the channel of the first mat portion.

An acoustical barrier adapted to be mounted to a barrier wall, the acoustical barrier comprising:

• first and second mat portions juxtaposed to each other in overlapping relationship, each mat portion being of a molded construction and having sound dampening characteristics with an inner surface adapted to face the barrier wall and an outer surface adapted to face away from the barrier wall;
• the first and second mat portions each having a terminal edge;
• the terminal edge of the second mat portion being in engagement with one of the inner and outer surfaces of the first mat portion to thereby acoustically seal the first and second mat portions together;
• a first spacer rib having one end integrally molded as a single piece with one of the first and second mat portions, the rib extending from the one mat portion to the other mat portion or from the one mat portion to the barrier wall when the acoustical barrier is mounted thereto, the first spacer rib being adjacent to but spaced from the terminal edge of the one mat portion to space the one mat portion from the other mat portion or to space the one mat portion from the barrier wall;
• an acoustical barrier wherein the second mat portion comprises an opening and the terminal edge of the second mat portion extends around the periphery of the opening, and further wherein the terminal edge of the first mat portion extends around an outer periphery thereof;
• and
• wherein the second mat portion comprises an opening and the terminal edge of the second mat portion extends around the periphery of the opening, and further wherein the terminal edge of the first mat portion extends around an outer periphery thereof.

An acoustical barrier adapted to be mounted to a barrier wall, the acoustical barrier comprising:

• first and second mat portions mounted to each other in overlapping relationship, each mat portion being of a molded construction and having sound dampening characteristics with an inner surface adapted to face the barrier wall and an outer surface adapted to face away from the barrier wall;
• the first and second mat portions each having a terminal edge and an integrally molded channel extending adjacent the terminal edge;
• the channel of the second mat portion being received within the channel of the first mat portion to thereby mutually align the first and second mat portions when mounting the mat portions together;
• the first mat portion comprises an opening and the terminal edge of the first mat portion extends around the periphery of the opening, and the terminal edge of the second mat portion extends around an outer periphery of the second mat portion;
• and
• the first mat portion comprises an opening and the terminal edge of the first mat portion extends around the periphery of the opening, and further wherein the terminal edge of the second mat portion extends around an outer periphery of the second mat portion.