heat sealing it to the membrane at mating surface 28 the clamping rib may be welded directly to tank surface 10 however the embodiment of the clamping rib as shown in fig6 shows the clamping rib attached to rib foot 17 which in turn is welded to the tank surface here rib foot 17 is welded to tank surface 10 and periodically connected along the length of the clamping rib by nut and bolt assembly 19 in addition the clamping rib and the rib foot are separated for thermal isolation by insulating spacer strip 18 at the tops and bottoms of the cladding membrane thus placed around the circumference of the structure similar clamping systems are provided in ring fashion fig7 shows in cross section the upward curvature of tank wall 29 at its interface with the vertical side of tank cap 30 supported around the tank collar in proximity of the interface of the surfaces is angle collar bracket 31 which supports a spaced series of studs which in turn fasten down clamping channel 33 the upper edge of the membrane panels terminate in roped edge 32 that is stretched and clamped by clamping channel 33 in similar fashion to that described in the vertical applications preceding weather cover 34 is heat sealed to the membrane body at surface 35 also in similar fashion to the vertical seams support for the angle bracket is not fully shown but will be understood by those versed in metal construction techniques to employ standard methods of welding or like securing means to the body of the structure similarly at the bottom fig8 shows angle collar bracket 37 fastened.