RESTAURO ARCHITETTONICO E LABORATORIO DI RESTAURO ARCHITETTONICO

Module RESTAURO ARCHITETTONICO

The course, composed by the units ARCHITECTURAL RESTORATION and RESTORATION WORKSHOP, pursues the general objective of allowing students to integrate the historical, technological and structural knowledge acquired in the previous years of study, using it appropriately for the conservation of the architectural heritage.

The course-unit of "Architectural Restoration" has as its educational aim the learning of restoration concept in its historical evolution and the acquisition of a correct methodology for the intervention on built heritage: from the cognitive phase to the interpretation of signs of deterioration and structural vulnerabilities up to the project. In this process, the study of figurative characters and construction techniques of a historical building (or an urban block) is the base of the choice of good practices for restoration. Theory and design examples drawn from the literature are used in the course to provide the necessary critical tools to make conservative design choices. During the course, students will practise recognising the stratifications of the architectural and constructive peculiarities of the historic buildings. They will elaborate thematic mapping of visible decays and instabilities to arrive at the restoration design through critical-interpretative reasoning. Thus, students will learn to orient themselves among the possible intervention choices, respecting the criteria of compatibility, 'potential reversibility' and 'minimum intervention'.

The teaching is carried out through frontal lectures on restoration theory, on historical building techniques, on intervention techniques;

The course-unit is developed in two phases:

• A. Theory and history of restoration
• B. Restoration of architecture.

Theory and history of restoration

The knowledge as premise for every operativity. Methodological process for built heritage intervention. The archaeological restoration and the examples of R. Stern and G. Valadier; The 19th century debate in Europe: E. Viollet - le - Duc and the 'stylistic' restoration; the J. Ruskin’s theories, the Antirestoration movement and W. Morris. The philological-historical and modern Restoration (L. Beltrami and C. Boito), the scientific Restoration (G. Giovannoni). The post-war period and the critical Restoration - Cesare Brandi.

The contemporary currents. The restoration and the reuse. The project on the built heritage today. Ways of approach to the historical pre-existences, categories and examples.

The Charters of restoration.

The Athens Charter, the 1932 and 1938 Italian Charter, the 1960 Gubbio Charter, Venice Charter, the 1972 Italian Charter, Integrated Conservation, Recommendations for buildings of special typology in seismic areas (1986), Restoration and Conservation Charter of 1987, Krakow Charter and Risk Charter.

KNOWLEDGE

1 Analysis of historical buildings:

Historical bibliographic research, survey;

the architectural organism as a system of constructive parts;

the structural typologies

2 Architectural Materials.

2.1 Stone materials

-Stone (physical and chemical characteristics, workability etc.)

-Systems of use in the construction (stone façades);

Wood (physical characteristics, use and frequent pathologies).

3 Architectural configuration and construction elements of historical buildings

3.1 Notes on the historical building systems in the Etnea area;

3.2 Masonry elements (foundations, masonry, vaults, architraves, platbands, archivolts, stairs);

3.3 Wooden structural elements: floors, roofs, architraves, centerig

3.4 Metal structural elements: floors, shelves tie-rods

4. Environmental protection systems in the rule of art

4.1 Surface protections (plasters);

4.2 Rising damp (barriers, sealing, crawl spaces);

4.3 Rainwater (roofing, gutters, downspouts);

INTERPRETATION - ANALYSIS OF THE STATE OF CONSERVATION

5. Surfaces

5.1 Definition of the main degradations on surfaces (NorMAL 1/88 and UNI 11183 Standards);

5.2 Main causes and phenomena of material degradation (chemical, physical, biological);

5.3 Reading of surfaces degradation (general and thematic maps of visible manifestations);

6. Damages recognition (in progress or previous), collapse mechanisms (local and global), damage scenarios.

6.1 Masonry structures

- structural failures due to crushing, buckling, differential failures; cracks frameworks

6.2 Vaulted structures: deformations cracking frameworks

6.3 Slabs: manifestations of failures

-wooden floors

-iron floors

DEFINITION OF THE CRITERIA OF THE RESTORATION PLAN - (REVERSIBILITY, COMPATIBILITY AND MINIMUM INTERVENTION)

7. Material restoration: techniques of conservative intervention (cleaning, consolidation, protection);

8. Protection from moisture (rising damp, rainwater);

9. Structural restoration: local and global interventions (vulnerability mitigation);

9.1 Local interventions

-Foundations, walls, floors and roofs

-Vaults

9.2 Global interventions

 -Tie-rods, curbs, corner bracing.

Exercise

The exercise consists in the study, in the classroom, of the historical building techniques of the Etna area and in the graphic elaboration of a historical recurrent housing type of the historical center of Catania or the Etna area based on a survey provided by the teacher.

The work will be organized in groups of 3-4 students.

• Topics related to one or more currents of theoretical restoration thought.
• Evolution of the concept of restoration in history.
• Methodological procedure for intervention on historic buildings: from knowledge to project.
• Description, also with graphic sketches, of the construction techniques of historical buildings, with particular regard to masonry architecture in the Etna area.
• Manifestations of the degradation and instability of stone materials and construction elements.
• Possible correlations between the construction system and current or potential instabilities.
• Explanation of restoration works (punctual and global) with detailed sketches
• Exposition of the design drawings.