Patent ID: 6912822

Claim:
A profiled sheet comprising a web formation having first and second opposite ends; a first panel segment extending generally transversely from the web formation at or towards the first end thereof; a second panel segment, extending generally transversely from the web formation at or towards the second end thereof; the first and second panel segments extending in opposite directions from the web formation; and the sheet further comprising a lip formation extending generally transversely from the first panel segment at an end defined by the panel segment distal to the web formation and extending from the first panel segment in a direction towards a plane wherein the second panel segment is located; wherein an engagement formation is located at or towards the end of the second panel segment distal to the web formation and an engagement formation in the form of a groove formation is located at or towards the end of the second panel segment proximate to the web formation; with the engagement formation located at or towards the end of the second panel segment distal to the web formation being suitable to engage the engagement formation located at or towards the end of the second panel segment proximate to the web formation of a similar profiled sheet; and each said engagement formation extending across the second panel segment in a direction generally parallel to the web formation; and wherein the lip formation includes an engagement formation in the form of a groove formation and wherein the web formation includes an engagement formation in the form of a groove formation suitable to engage an engagement formation in the form of a groove formation provided in the lip formation on a similar profiled sheet.