1. Air ducts as an additional protection of buildings against moisture: Is it sustainable solution?
Eva HÁJKOVÁ, Jiří PAZDERKA
Department of Building Structures, Czech Technical University in Prague,

2. Presentation outline Description of selected historic object
Implemented remedial measures
Technical building survey
Building moisture survey
Capacity measurement results
Acknowledgement
Research project „Analysis of the Effectiveness of Modern Methods of Rehabilitation of Buildings Affected by Moisture“, no. SGS15/128/OHK1/2T/11.

3. Selected historic object
Wing of a historic hospital building from the 19th century in Prague

4. Implemented remedial measures
Longitudinal air duct
EVAPORATION ZONE
MOISTURE RISING FROM THE SUBSOIL

5. Implemented remedial measures
Longitudinal air duct with intake vent at the point of the stairway

6. Implemented remedial measures
Longitudinal air duct with outlet vent made in the window parapet

7. Technical building survey
Moisture failures and their causes
Scheme of a ventilated air layer

8. Building moisture survey
Schema of building with marked position of the measurement points

9. Capacity measurement results
Values of moisture measured by the capacitance meter

10. Conclusion
High moisture values do not comply with the requirements of ČSN
Very long distances between the air intake and outlet limit the functionality of the drying channel
Poor maintenance of the expiratory openings of the air duct
Sustainable remediation method for historic buildings X efficiency

11. Thank you for your attention!