If you are coming from Villach/Hermagor or Italy: From the A2 south motorway, take the Hermagor exit and continue on the B111 to Hermagor. From Hermagor continue in the direction of Weißbriach. Jadersdorf is located shortly before Weißbriach.
If you are coming from Weißensee: Drive over the Kreuzberg to Weißbriach, then continue in the direction of Hermagor to Jadersdorf.