Heat transfer through anchoring elements in a rear-ventilated rainscreen insulation system for façade retrofit

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URI: https://hdl.handle.net/11556/2533
ISSN: 2386-8198
ISBN: 9788469770320
ISBN: 9788469770320
Publication date
2018
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University of Cantabria - Building Technology R&D Group
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Abstract
Rear-ventilated rainscreen façade insulation systems are becoming a popular retrofit solution in Southern European climates, due to their good thermal performance in both winter and summer conditions. In these assemblies, the substructure of the new cladding is anchored to the original building, thus puncturing the thermal insulation. This study assesses the impact of such thermal bridges on the overall thermal performance of the external wall. The renovation of a conventional Spanish wall construction with a ventilated façade is used as a case study, featuring an anchoring system with L-shaped aluminium brackets. Two scenarios have been assessed: in the first one these brackets are fixed onto both the reinforced concrete slabs and the existing brickwork of the building, while in the second one they are anchored solely to the structural slabs. Simplified one-dimensional calculations are compared with two-and three-dimensional numerical models. Results indicate that anchoring elements can account for a substantial increase in heat flow. If the additional heat transfer through the anchoring elements is not taken into account, the energy savings delivered by the renovation could be considerably lower than expected by calculations, resulting in an increase of energy consumption over predicted values.
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Publisher Copyright: © 2018, University of Cantabria - Building Technology R&D Group. All rights reserved.
Keywords
Finite element method , Thermal bridge , Thermal insulation , Ventilated façade , Mechanics of Materials , Building and Construction , Geography, Planning and Development , Cultural Studies , Urban Studies , SDG 7 - Affordable and Clean Energy
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conference output
Citation
Arregi Goikolea , B , Garay Martinez , R , Riverola Lacasta , A & Chemisana Villegas , D 2018 , Heat transfer through anchoring elements in a rear-ventilated rainscreen insulation system for façade retrofit . in L Villegas , I Lombillo , H Blanco , Y Boffill , L Villegas , I Lombillo , H Blanco & Y Boffill (eds) , REHABEND . REHABEND , vol. 0 , University of Cantabria - Building Technology R&D Group , pp. 1694-1701 , 7th Euro-American Congress on Construction Pathology, Rehabilitation Technology and Heritage Management, REHABEND 2018 , Cáceres , Spain , 15/05/18 .
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