Wall for a leaktight and thermally insulating vessel

A wall (11) for a sealed and thermally insulating storage tank for a liquefied gas, the wall (11) comprising successively, in a thickness direction:

• a secondary thermally insulating barrier (12) that bears against a load-bearing structure (1);
• a secondary sealing membrane (13) that bears against the secondary thermally insulating barrier (12);
• a primary thermally insulating barrier (14) that bears against the secondary thermally insulating barrier (13);
• and
• a primary sealing membrane (15) that bears against the primary thermally insulating barrier (14) and for contact with the liquefied gas contained in the tank;
• wherein the primary sealing membrane (15) comprises a first series of corrugations (45a) having first corrugations parallel to each other, a second series of corrugations (45b) having second corrugations parallel to each other and perpendicular to the first corrugations, and a plurality of flat zones (46) that are each defined between two adjacent first corrugations and between two adjacent second corrugations,
• wherein the primary thermally insulating barrier (14) comprises at least a first row of load-bearing members comprising successively, in a direction parallel to the first corrugations, at least first, second and third load-bearing members (30) that are fastened to the secondary thermally insulating barrier (12) and that extend in the thickness direction, wherein no other load-bearing member of the first row of load-bearing members are interposed between the first and second load-bearing members and between the second and third load-bearing members;
• and
• wherein the first, second and third load-bearing members (30) are respectively fastened to first, second and third inner plates (42), wherein the plurality of flat zones (46) comprises successively, in a direction parallel to the first corrugations, first, second and third flat zones that are respectively welded against the first, second and third inner plates (42), and wherein no other flat zone of the plurality of flat zones (46) being interposed between the first and second flat zones and between the second and third flat zones.