Waterproofing building product

A waterproofing building product for use in waterproofing a joint between a first and second roofing panel, the waterproofing building product longitudinally extending between a first longitudinal end and a second longitudinal end and including:

• an overlapping section operatively adapted to overlap, in use, a portion of the first roofing panel;
• an underlapping section operatively adapted to underlap, in use, a portion of the second roofing panel;
• and
• a transition section located between the overlapping section and the underlapping section and connecting the overlapping section with the underlapping section;
• wherein the overlapping section at the first longitudinal end includes a ridge overlapping section operatively adapted to overlap a first ridge of the first roofing panel;
• wherein the ridge overlapping section defines a ridge recess operatively adapted to receive the first ridge of the first roofing panel;
• wherein the overlapping section includes a transverse groove overlapping section operatively adapted to overlap, in use, a groove of the first roofing panel, the groove overlapping section longitudinally extending between the ridge overlapping section and the second longitudinal end;
• wherein the underlapping section at the first longitudinal end includes a ridge underlapping section operatively adapted to underlap, in use, a first ridge of the second roofing panel;
• wherein the underlapping section includes a transverse groove underlapping section operatively adapted to underlap, in use, a groove of the second roofing panel, the groove underlapping section longitudinally extending between the ridge underlapping section and the second longitudinal end;
• wherein the ridge underlapping section defines a ridge insertion portion operatively adapted to be located, in use, within a first panel recess defined by the second roofing panel;
• wherein the overlapping section includes a transverse overlapping flange at the second longitudinal end of the waterproofing building product operatively adapted to be located, in use, adjacent a second ridge of the first roofing panel;
• wherein the underlapping section includes a transverse underlapping flange at the second longitudinal end of the waterproofing building product operatively adapted to be received, in use within a second panel recess defined by the second roofing panel;
• and
• wherein the groove overlapping section includes a groove overlapping face having a first groove overlapping width at the first longitudinal end and a second groove overlapping width at the second longitudinal end wherein the magnitude of the first groove overlapping width is different to the magnitude of the second groove overlapping width.