For the Highest Quality Thermal and Sound Insulation, of Course, You Canetal -plastic Systems. Most Offen, whether the Glazing of Balconies is Planned, Professionals in this Opt for Standard PVC Systems, But Due to the Large Glazing Area and Huge Sashs, Special Attendionia Mr. Ust Be Paid Precisly for the Strength of the Entire Structure. In Metal -plastic Structures, it is Customary to use a steel or aluminum, reinforcing profile to strengthen the system to strengthen the system.