Impact of climatic parameters on rain protection layer design for refurbished historic buildings

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Dario Bottino-Leone - , TUD Dresden University of Technology (Author)
  • Marco Larcher - , Eurac Res (Author)
  • Alexandra Troi - , Coburg Univ Appl Sci, Hochschule Coburg (Author)
  • John Grunewald - , Chair of Building Physics (Author)

Abstract

The application of interior insulation systems consistently increases energy performance of historic buildings, but also severely affects the drying potential of their envelopes reducing the evaporation potential towards the internal side. This reduction is even more critical in facades interested by a significant amount of driving rain. To face this problem, current recommendations and standards suggest the replacement of the original plaster with a "water repellent" one especially in climates with a high yearly horizontal precipitation. However, since this kind intervention represents a big economic and environmental cost, more specific studies are needed to identify whether it is always necessary. In fact, current approach excludes the impact of solar radiation, which may play a significant role for evaporation phenomena. Moreover, wind effect may be taken into account by considering the wind driven rain instead of horizontal rain amount. In order to investigate these hypotheses, this simulation based study analyzes hygrothermal performances of an internally insulated wall in several European climates and latitudes, with similar annual precipitation and different solar radiation amount and wind conditions. Results show that considering wind action is important to give a more precise estimation of the effective rain impacting the facade. Moreover, water repellent exterior plasters could be avoided in facades with consistent amounts of solar radiation. Consequently, there is currently the need of a more elaborated method for identifying the necessity of replacing the historic external plasters; this method should include external climate factors, as e. g. solar radiation and wind action.

Details

Original languageEnglish
Article number111688
Number of pages10
JournalRenewable & sustainable energy reviews
Volume2021
Issue number152
Publication statusPublished - Dec 2021
Peer-reviewedYes

External IDs

Scopus 85116573151

Keywords

Keywords

  • Historic buildings, Hygrothermal simulations, Interior insulation, Rain protection, Exterior plaster, Facade coating, Solar radiation, Drying potential, Wind driven rain, WIND-DRIVEN RAIN, INTERNAL INSULATION, SOLID MASONRY, HYGROTHERMAL CONDITIONS, PERFORMANCE, SYSTEMS, FACADE, WALLS, RISK, COLD

Library keywords