The particularly evolved Transylvanian vernacular architecture research did not follow in every aspect the western examples and from multiple points of view dropped behind compared to the systematic processing of Hungarian research results.

In Ancient cultures the shaping of the created spaces were submitted to the function.

The heightened interest for research on baroque roof structures, both from a structural viewpoint and from the history of architecture viewpoint, contributes to an increase of the number of publications on the topic, not only in Transylvania but in Germany or Hungary as well.

The article presents the main results obtained through the archaeological researches conducted between 2000 and 2011, at the interior and the exterior of the Roman Catholic cathedral in Alba Iulia, during the historic building’s conservation.