Abstract: A closure (38) for an annular clearance (36) between a floating tank roof (20) and a generally cylindrical tank (10) including the method of installation is provided. The closure (38) includes a plurality of arcuate shoes (40) mounted about the inner circumference of the tank (10) with variable length hanger rods (74, 75) connecting the shoes (40) for movement with the floating roof (20). A connecting expansion joint (84) connects spaced sides (42) of adjacent arcuate shoes (40) and includes a removable unit (95) of flexible material (100) which may be easily inserted and removed manually from the upper ends of retainer brackets (86) secured to the arcuate shoes (40) in a minimum of time while the tank (10) is in service. The expansion joints (84) may be easily disassembled for repair or maintenance of shoes (40) and associated components by removal of a cover (106) and removable connecting units (95).