Notched trough ridge
Sheet metal strip of 37 cm useful width and 2 or 4 m long, folded in two at 130° and with a hook of 4 cm each on the ends in the direction of the length. The height of the ridge is 12,5 cm and the hooks are provided with entrails that can be easily fitted on the ribs of the sheet metal.
It is mainly installed on the top of a sheet metal structure to ensure the junction and the watertightness between two symmetrical slopes.