Norwegian Pitched Roof Defects

Gullbrekken, Lars; Kvande, Tore; Jelle, Bjørn Petter; Time, Berit

doi:10.3390/buildings6020024

Cited by 33 publications

(30 citation statements)

References 8 publications

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“…Even roofs in tropical climates have almost the same type of damage as here in more Nordic regions (Carretero-Ayuso, Moreno-Cansado, & de Brito, 2017). With reference to Gullbrekken, Kvande, Jelle, and Time (2016) and Carretero-Ayuso et al (2017) and their research material, the main roof defects are presented in Table 1.…”

Section: Introductionmentioning

confidence: 93%

“…No matter what the roof is, the factors on the roof can work the same, depending on the climatic conditions (see Table 2). Lars Gullbrekken in his analysis of poor roof defects has highlighted the factors that have the greatest impact on all possible roofs (Gullbrekken et al, 2016). According to him, the critical factor is snow, which accumulates on the roofs, fluctuating in temperature, it melts and freezes again and expands.…”

Section: Introductionmentioning

confidence: 99%

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Multi-criteria assessment of pitched roof reconstruction technologies

Kuznecov

Šaparauskas

2019

Modern Building Materials, Structures and Techniques (MBMST)

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The paper examines the technologies of reconstruction of sloping-pitched roofs, their application and eficiency. The analysis consist of the main characteristics of pitched roofs types, causes of their damages. The work also analyzes roof defects, the main causes of these defects. There are described ways how to improve performance of roofs. Three different reconstruction technologies are distinguished, which are compared between each other using multicriteria evaluation methods ARAS (additive ratio assessment) and COPRAS (Complex Proportional Assessment). After performing a multi-criteria assessment, we found that the use of polyurethane foam is the best choice for roof reconstruction work.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Multi-criteria assessment of pitched roof reconstruction technologies

Kuznecov

Šaparauskas

2019

Modern Building Materials, Structures and Techniques (MBMST)

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“…Pitched wooden roofs, defined as pitched roofs with a wooden load-bearing structure [1], are traditionally and widely used on small-scale buildings in Nordic countries. The use of wooden roofs poses certain challenges, as building envelopes are subject to large weather strains and related damage risks [2]. To ensure their durability, pitched roofs are designed to be naturally ventilated by allowing air to flow through an air cavity beneath the roofing.…”

Section: Pitched Wooden Roofsmentioning

confidence: 99%

Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs

et al. 2020

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Pitched wooden roofs are ventilated through an air cavity beneath the roofing in order to remove heat and moisture from the roof construction. The ventilation is driven by wind pressure and thermal buoyancy. This paper studies ventilation driven by thermal buoyancy in the air cavity of inclined roofs. The influence of air cavity design and roof inclination on the airflow is investigated. Laboratory measurements were carried out on an inclined full-scale roof model with an air cavity heated on one side in order to simulate solar radiation on a roof surface. Equipment to measure temperature was installed in the roof model, while air velocity in the cavity was determined by smoke tests. Combinations of different roof inclinations, air cavity heights and applied heating power on the air cavity top surface were examined. The study showed that increased air cavity height led to increased airflow and decreased surface temperatures in the air cavity. Increased roof inclination and heating power applied to the roofing also increased the airflow. The investigations imply that thermal buoyancy in the air cavity of pitched roofs could be a relevant driving force for cavity ventilation and important to consider when evaluating the heat and moisture performance of such a construction.

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“…Other degradation factors include chemicals (in air pollution, salt spray or bird droppings) and mechanical wear (wind, hail or foot traffic). Gullbrekken et al (2016) conducted research on roof defects in Norway, but with a focus on pitched, ventilated roofs. There appears to be a deficiency of research into the material supply aspect of roof defects.…”

Section: Literature Review Flat Roof Constructionsmentioning

confidence: 99%

“…The roof is usually the most exposed façade of a building, and its protection is crucial to secure the integrity of the rest of the structure. A study by Gullbrekken et al (2016) revealed that roof defects made up 22 % of all building defects investigated by the SINTEF Building and Infrastructure. Out of these were 19 % on compact roofs and 28 % on terraces.…”

Section: Introductionmentioning

confidence: 99%

Governing Flat-Roof Constructions: A Case Study

Engebø¹,

Andenæs²,

Kvande³

et al. 2018

26th Annual Conference of the International Group for Lean Construction

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A lean construction process depends on reliable procuring and governing of materials. This paper examines the case of flat roof constructions. It is based on an assumption that current practice might lead to a risk of premature roof failures. Within the case of flat roof constructions, we seek to answer the following research questions:  What are the main threats to the value for the client in the case of flat-roof constructions?  How does the client govern in order to oversee that requirements are met regarding construction materials-and assembling? The research was explorative in nature and limited to the Norwegian context; based on a scoping literature study and seven semi-structured in-depth interviews with experienced industry actors. The findings show that in a short-term perspective, the divergence of stakeholder interest and premature roof failures present a great threat to the value of the building. Poor procuring and handling threatens the construction process. It is a source of disputes between the contractor and the client. Furthermore, it constitutes an obstacle in creating long-term value for the client. Flat-roof constructions are particularly exposed. We propose that clients should implement a more structured approach to overseeing that client requirements are met. To ensure a lean project delivery and maximizing value, mitigating unwanted events related to suppliers and materials are crucial.

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Norwegian Pitched Roof Defects

Cited by 33 publications

References 8 publications

Multi-criteria assessment of pitched roof reconstruction technologies

Multi-criteria assessment of pitched roof reconstruction technologies

Experimental Study of Thermal Buoyancy in the Cavity of Ventilated Roofs

Governing Flat-Roof Constructions: A Case Study

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