Roof (Thickness)

Question 1

Roof plates corroded to an average thickness of ,,,,,,,,, shall be repaired or replaced

Answer 1

< 0.09” in any 100 in.2 area or

roof plates with any holes through the roof plate

Question 2

Supported Cone Roofs -

The minimum thickness of new roof plates shall be ,,,,,,

Answer 2

3/16 “ (4.76 mm) plus C.A

Question 3

Self-supporting Roofs-

The nominal thickness of new roof plate shall be,,,,

Answer 3

3/16 “ (4.76 mm) or

Question 4

Plates more than 40 mm (1.5 in.) thick shall be of

Answer 4

killed steel made to
fine-grain practice and
Heat treated
Impact tested

Question 5

Plates less than or equal to 40 mm (1.5 in.) thick may be used ,,,,,

Answer 5

at or above the DMT

Question 6

The minimum thickness of new roof plates shall be ,,

Answer 6

3/16 “ (4.76 mm) + C.A