About joining-profiles The joining-profiles are used between the channel sheets, to mounter the sheets to the roof contruction.  The joining-profiles are made of 2 parts, a bottom and a top part. The bottom part is screwed on to the eaves or battens. The sheets are put on top the rubber band, and the top part is easily clicked on.  The price calculater makes an automatic calculation of how many you need and in which length you need them.  The ends of the joining-profiles are nicely covered byt the profile endings (not shown).    Joining-profile Alu-System Joining-profile Thermo-System