An apparatus for providing backing for U-shaped studs in a wall, said backing apparatus comprising: a first backing member having a first end, a second end, a top, a bottom, a first side and a second side; characterised in that the backing apparatus further comprises: a second backing member having a first end, a second end, a top, a bottom, a first side and a second side; and a hinge operatively attached to said first side of said first and second backing members (13, 14) for permitting said second backing member to pivot with respect the first backing member between a first position wherein the first sides of said first and second backing members (13, 14) are substantially in the same plane and a second position wherein the first sides of said first and second backing members (13, 14) are not in the same plane, whereby said first backing member can be placed between a first and a second adjacent upright U- shaped stud, the second backing member can be pivoted with respect to the first backing member to the second position, and then can be pivoted to the first position thereof, to be disposed between said second upright U-shaped stud and a third upright U-shaped stud closer to said second upright U-shaped stud than to said first upright U-shaped stud, whereby said second end of said first backing member is adjacent to and on one side of the second upright U-shaped stud and the first end of the second backing member is adjacent to and on the other side of said second upright U-shaped stud; wherein: said second backing member has a vertical groove in the said first side thereof for receiving a flange of the second upright U-shaped stud, said groove being at least partially covered by said hinge when the first and second backing members (13, 14) are in the first position thereof. a first backing member having a first end, a second end, a top, a bottom, a first side and a second side; characterised in that the backing apparatus further comprises: a second backing member having a first end, a second end, a top, a bottom, a first side and a second side; and a hinge operatively attached to said first side of said first and second backing members (13, 14) for permitting said second backing member to pivot with respect the first backing member between a first position wherein the first sides of said first and second backing members (13, 14) are substantially in the same plane and a second position wherein the first sides of said first and second backing members (13, 14) are not in the same plane, whereby said first backing member can be placed between a first and a second adjacent upright U- shaped stud, the second backing member can be pivoted with respect to the first backing member to the second position, and then can be pivoted to the first position thereof, to be disposed between said second upright U-shaped stud and a third upright U-shaped stud closer to said second upright U-shaped stud than to said first upright U-shaped stud, whereby said second end of said first backing member is adjacent to and on one side of the second upright U-shaped stud and the first end of the second backing member is adjacent to and on the other side of said second upright U-shaped stud; wherein: said second backing member has a vertical groove in the said first side thereof for receiving a flange of the second upright U-shaped stud, said groove being at least partially covered by said hinge when the first and second backing members (13, 14) are in the first position thereof. a second backing member having a first end, a second end, a top, a bottom, a first side and a second side; and a hinge operatively attached to said first side of said first and second backing members (13, 14) for permitting said second backing member to pivot with respect the first backing member between a first position wherein the first sides of said first and second backing members (13, 14) are substantially in the same plane and a second position wherein the first sides of said first and second backing members (13, 14) are not in the same plane, whereby said first backing member can be placed between a first and a second adjacent upright U- shaped stud, the second backing member can be pivoted with respect to the first backing member to the second position, and then can be pivoted to the first position thereof, to be disposed between said second upright U-shaped stud and a third upright U-shaped stud closer to said second upright U-shaped stud than to said first upright U-shaped stud, whereby said second end of said first backing member is adjacent to and on one side of the second upright U-shaped stud and the first end of the second backing member is adjacent to and on the other side of said second upright U-shaped stud; wherein: said second backing member has a vertical groove in the said first side thereof for receiving a flange of the second upright U-shaped stud, said groove being at least partially covered by said hinge when the first and second backing members (13, 14) are in the first position thereof. said second backing member has a vertical groove in the said first side thereof for receiving a flange of the second upright U-shaped stud, said groove being at least partially covered by said hinge when the first and second backing members (13, 14) are in the first position thereof.