PREFA Aluminiumprodukte GmbH PREFA has been successfully developing, producing and marketing aluminium roof and façade system ... s in Europe for over 70 years. The PREFA group has over 500 members of staff. Over 4,000 high-quality products are produced exclusively in Austria and Germany. PREFA belongs o the group of companies owned by the industrialist, Dr. Cornelius Grupp, which employs over 6,000 members of staff in over 30 production sites throughout the world. read more