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Metal can be used as a roof covering in several different ways. The main forms are based on sheet-like panels, which may be flat or profiled, and either prefabricated, or formed on site, but metal can also be used to create shingles - formed into shapes similar to tiles, shakes or slates. Sheet metal roofing is typically joined by standing seams or rolled joints. These have no exposed mechanical fasteners, but use a clipped, or rolled design which creates a distinctive projecting seam. This is a very flexible system that can be per-fabricated or formed on site, and used to create straight or curved seams. A wide range of profiled and corrugated metal roof panels sometimes referred to as 'wriggly tin' are also available, historically associated with industrial buildings, as well as built-up roofing systems and trims and flashing to form valleys, ridges, roof lights, aprons, sills, corners, barges and so on. Sheet metal roofing is typically joined by standing seams or rolled joints. These have no exposed mechanical fasteners, but use a clipped, or rolled design which creates a distinctive projecting seam. This is a very flexible system that can be per-fabricated or formed on site, and used to create straight or curved seams. A wide range of profiled and corrugated metal roof panels sometimes referred to as 'wriggly tin' are also available, historically associated with industrial buildings, as well as built-up roofing systems and trims and flashing's to form valleys, ridges, roof lights, aprons, sills, corners, barges and so on. Sheet metal roofing is typically joined by standing seams or rolled joints. These have no exposed mechanical fasteners, but use a clipped, or rolled design which creates a distinctive projecting seam. This is a very flexible system that can be per-fabricated or formed on site, and used to create straight or curved seams. A wide range of profiled and corrugated metal roof panels sometimes referred to as 'wriggly tin' are also available, historically associated with industrial buildings, as well as built-up roofing systems and trims and flashing to form valleys, ridges, roof lights, aprons, sills, corners, barges and so on.

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