Characterisation of a multilayer external wall thermal insulation system. Application in a Mediterranean climate

Pedroso, Marco; Flores‐Colen, Inês; Silvestre, José Dinis; Gomes, M. Glória; Silva, Luis; Sequeira, Pedro

doi:10.1016/j.jobe.2020.101265

Cited by 26 publications

(26 citation statements)

References 40 publications

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“…This fact can be related with the fragility of the thermal insulating nano aggregates [25,71] but also with the high need for kneading water that leaves capillaries and pores when it evaporates after the hydration reactions [114], indicating the need for further development. However, as shown by Pedroso et al [115], this can be overcome using multilayer protective systems.…”

Section: Discussion Of the Pca And Factor Analysismentioning

confidence: 99%

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

et al. 2020

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This research provides a statistical analysis of the mechanical and physical properties of thermal insulating mortars developed in the laboratory and by the industry with and without the incorporation of nanomaterials. This was evaluated by carrying out a uni and bivariate analysis, principal components and factor analysis, cluster analysis, and the application of regression models. The results show that it is possible to find associations between these mortars’ properties, but also how these formulations’ development can be approached in the future to achieve better overall performance. They also show that the use of nanomaterials, namely silica aerogel, significantly improved the mortars’ thermal insulation capabilities, allowing us to obtain mortar formulations with thermal conductivities below the values presented by classic thermal insulating materials. Therefore, with this investigation, other researchers can support their product-development choices when incorporating nanomaterials to reduce mortars’ thermal conductivities, increasing their production efficiency, overall multifunctionality, and sustainability.

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Section: Discussion Of the Pca And Factor Analysismentioning

confidence: 99%

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

et al. 2020

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“…The components of the protective coating system are commercially available and were composed of a basecoat [ 44 ], in which was embedded a fiberglass mesh and a finishing coating [ 45 ]. The total protective coating system, previously studied by Pedroso et al [ 46 ], presented a thickness of ~5 mm, where the basecoat with the fiberglass was ~3 mm thick and the coating system was ~2 mm in thickness. This coating system was intended, not only to improve the mechanical resistance of the complete multi-layered solution but, at the same time, to significantly reduce the capillary water absorption of the render [ 46 ].…”

Section: Methodsmentioning

confidence: 99%

“…The total protective coating system, previously studied by Pedroso et al [46], presented a thickness of ~5 mm, where the basecoat with the fiberglass was ~3 mm thick and the coating system was ~2 mm in thickness. This coating system was intended, not only to improve the mechanical resistance of the complete multi-layered solution but, at the same time, to significantly reduce the capillary water absorption of the render [46]. The JM aging cycle consisted of a heat-cold cycle-−5 • C for 11 h and then 65 • C for 7 h. The temperature increased linearly and decreased between the two stages, which resulted in a complete daily cycle (24 h), and was repeated 30 times.…”

Section: Mortar and Protective Coating Systemmentioning

confidence: 99%

Durability of a New Thermal Aerogel-Based Rendering System under Distinct Accelerated Aging Conditions

et al. 2021

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The widespread application of innovative thermal enhanced façade solutions requires an adequate durability evaluation. The present work intends to assess the durability of a new aerogel cement-based rendering system through the adaptation of different accelerated aging cycles, such as heating–freezing, freeze–thawing, and heat–cold. Several mechanical properties and also capillary and liquid water absorptions were tested for uncoated and coated specimens. A decrease in the mechanical strength, especially after freeze–thaw cycles, was observed. However, the water action promoted the late hydration of the cement paste contributing to the densification of the matrix and, consequently, the increase of the adhesive strength. Additionally, a decrease in the dynamic modulus of elasticity and an increase in the Poisson’s ratio were observed after aging, which indicates a higher capacity of the render to adapt to substrate movements, contributing to a reduction of cracking.

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“…Delivering new low energy buildings and improving the energy efficiency of existing building stock are equally important to achieving that goal. External wall insulation (EWI) plays a very important role in building the energyretrofitting process because it is able to reduce the building energy demand, improve the indoor acoustic environment and extend the life span of the buildings by cutting down the heat loss through building fabric, filtering incoming external noises and preventing the formation of condensation in the wall [4][5][6]. Hence, as a low-hanging fruit, the measures of installing EWI has always been taken in building industries to cut down the carbon emission and in some occasion to improve the aesthetic of the buildings.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, applying the thermal barrier coating on the outer surface of the wall or roof is a common solution to enhance the heat insulation performance of a building in the regions with a subtropical or tropical climate [5,7,8]. Alternatively, thermal insulation the interaction of external factors such as typhoons, earthquakes and dramatic temperature changes, problems such as falling and defects of tiles will affect the buildings' appearance and even endanger the safety of the people.…”

Section: Introductionmentioning

confidence: 99%

The Application of Silica-Based Aerogel Board on the Fire Resistance and Thermal Insulation Performance Enhancement of Existing External Wall System Retrofit

et al. 2021

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Due to the need of good thermal performance, external wall insulation (EWI) is usually made of materials that are not fire resistant and sometimes flammable. That restricts its application to a particular circumstance such as limited building height. Hence, a material with good thermal insulation and fire resistance performance would allow EWI to be more widely applied. This paper introduces a novel material: a silica-based aerogel porous board, which differs itself from mainstream products available in the market because of its outstanding properties, such as low density, high surface area, low thermal conductivity and superhydrophobicity. Herein, its thermal insulation and fire-resistant performance were tested and compared with commercial products. The cone calorimeter analysis results indicated that the aerogel porous board could improve the fire resistance performance. Moreover, the evaluation of thermal insulation performance suggested that the application of an aerogel porous board on the external stone wall of existing buildings can decrease the U-value by 60%. Through the detailed insight into the case-study, it is quite clear that the carbon impact of building stock could be greatly reduced by means of a coherent set of building envelope retrofitting actions based on this innovative heat insulation material, without compromising the fire safety.

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Characterisation of a multilayer external wall thermal insulation system. Application in a Mediterranean climate

Cited by 26 publications

References 40 publications

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

Durability of a New Thermal Aerogel-Based Rendering System under Distinct Accelerated Aging Conditions

The Application of Silica-Based Aerogel Board on the Fire Resistance and Thermal Insulation Performance Enhancement of Existing External Wall System Retrofit

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