Mold Growth on ETICS (EIFS) as a Result of ‘‘Bad Workmanship’’?

Sedlbauer, Klaus; Krus, Martin

doi:10.1177/0075424202026002782

Cited by 12 publications

(6 citation statements)

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“…Previous studies pointed high values of surface moisture content as the cause of biological growth. External surface moisture results from the combined effect of four parameters: surface condensation, wind-driven rain, drying process and properties of the exterior layer (Barberousse et al, 2007; Becker, 2003; Blaich, 1999; Hens and Carmeliet, 2002; Krus et al, 2006; Kunzel and Sedlbauer, 2001; Sedlbauer and Krus, 2002; Venzmer et al, 2008). Although several factors contribute to the phenomenon, surface condensation is a specific hazard for ETICS, due to the low thermal capacity of its external rendering, and has considerable impact on the phenomenon, as it occurs during all the year at equivalent intensity (Barreira and Freitas, 2013).…”

Section: Introductionmentioning

confidence: 99%

The effect of nearby obstacles in surface condensations on external thermal insulation composite systems: Experimental and numerical study

Barreira

Freitas

2013

Journal of Building Physics

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External thermal insulation composite systems are, nowadays, quite common in European buildings, used both in new constructions and refurbishment. Unfortunately, external thermal insulation composite systems can have serious problems of biological growth causing the cladding defacement. Studies carried out in recent years allowed understanding the hygrothermal behaviour of external thermal insulation composite systems. It is known that biological growth is due to high values of surface moisture content, which depends mostly on exterior surface condensation. Despite this existing knowledge, there is little information available about the influence of obstacles near the fac xade on condensation and surface moisture content. In this article, the results of a field test campaign to assess the influence of obstacles on surface condensation are presented. They show that nearby obstacles influence exterior surface temperature during the night and, consequently, surface condensation. Different obstacle configurations have different effects, which may lead to stained patterns on the fac xade due to differential biological growth rates. The effect of nearby obstacles on exterior surface condensation, revealed during the test campaign, addressed the development of a numerical routine to simulate their influence. This routine can be used with any existing hygrothermal model with the ability to simulate explicitly the radiative balance on the Downloaded from exterior surface. It calculates the increase in long-wave radiation due to the obstacle as a function of its geometry and emissivity of its surface. This extra amount of radiation is added to the atmospheric radiation that is an input of the hygrothermal models. The validation of this routine was performed by comparing simulated and experimental results. An example of the practical use of this routine is also presented in this article, with the calculation of the exterior surface condensation on different fac xades covered with external thermal insulation composite systems, with and without nearby obstacles, and its comparison with the coating defacement that they actually present.

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Section: Introductionmentioning

confidence: 99%

The effect of nearby obstacles in surface condensations on external thermal insulation composite systems: Experimental and numerical study

Barreira

Freitas

2013

Journal of Building Physics

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“…Drying out of the constructional moisture from the original wall could cause an increase of the moisture content in the structures above the critical level [24][25][26]. It is shown that drying out only by diffusion might take up to eight years [27]. Concerning high WDR for instance in Norway it is concluded that one frequent cause of the defect is the incorrect assembly of the components of the ETICS [28].…”

Section: En-activetics Requirementsmentioning

confidence: 99%

The integration of selected technology to energy activated ETICS - theoretical approach

et al. 2020

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The main goal of this study is to develop the new external thermal insulation composite system (ETICS) by integration of flexible photovoltaic (FPV) and encapsulated phase change materials (PCM). This work is the first step of the international project En-ActivETICS and concerns mainly material selection and systems integration issues. The paper presents a complete solution of façade component which integrates thermal insulation, heat storage and electricity generation - En-ActivETICS that combines ETICS technology with a self-supporting flexible photovoltaic elements. This system will be applicable for both masonry or concrete constructions and it is a new step in the development of building facade technology allowing to achieve a component classified to the group of functional material. In the paper, the formulation of basic principles of En-ActivETICS as well as an overview of existing materials and technologies is presented. Finally, the initial concept of the system is described. The main features of that system is using an elastic, high heat capacity and frost resistant adhesive joining flexible PV with thermal insulation.

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“…Studies already performed in this field pointed high values of surface moisture content as the cause of biological growth. External surface moisture results from the combined effect of four parameters: surface condensation, wind-driven rain, drying process, and properties of the exterior layer [3,5,[7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

External Thermal Insulation Composite Systems: Critical Parameters for Surface Hygrothermal Behaviour

Barreira

Freitas

2014

Advances in Materials Science and Engineering

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External Thermal Insulation Composite Systems (ETICS) are often used in Europe. Despite its thermal advantages, low cost, and ease of application, this system has serious problems of biological growth causing the cladding defacement. Recent studies pointed that biological growth is due to high values of surface moisture content, which mostly results from the combined effect of exterior surface condensation, wind-driven rain, and drying process. Based on numerical simulation, this paper points the most critical parameters involved in hygrothermal behaviour of ETICS, considering the influence of thermal and hygric properties of the external rendering, the effect of the characteristics of the façade, and the consequences of the exterior and interior climate on exterior surface condensation, wind-driven rain, and drying process. The model used was previously validated by comparison with the results of an “in situ” campaign. The results of the sensitivity analyses show that relative humidity and temperature of the exterior air, atmospheric radiation, and emissivity of the exterior rendering are the parameters that most influence exterior surface condensation. Wind-driven rain depends mostly on horizontal rain, building’s height, wind velocity, and orientation. The drying capacity is influenced by short-wave absorbance, incident solar radiation, and orientation.

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Mold Growth on ETICS (EIFS) as a Result of ‘‘Bad Workmanship’’?

Cited by 12 publications

References 0 publications

The effect of nearby obstacles in surface condensations on external thermal insulation composite systems: Experimental and numerical study

The effect of nearby obstacles in surface condensations on external thermal insulation composite systems: Experimental and numerical study

The integration of selected technology to energy activated ETICS - theoretical approach

External Thermal Insulation Composite Systems: Critical Parameters for Surface Hygrothermal Behaviour

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