Inverted roof insulation kits and their durability

Abstract

Abstract. In the paper there was analyzed a mechanism of loss of performance properties of inverted roof insulation kits resulted by moisture increase of the insulation layers. This problem is very important in such systems because the thermal insulation is placed above the waterproofing layer and is not protected against water absorption. Abovementioned problem is more and more common in the course of building's utilization in Polish climate conditions. Because inverted roof kits are based on extruded polystyrene (XPS) and expanded polystyrene (EPS) , those materials have been used in tested samples. The results of laboratory tests showed the phenomenon and its effect on durability and sustainability of roof covering performance. It was also found that the biggest influence on the increase of moisture in the thermal insulation layer has not the long term water absorption by immersion but freeze -thaw cycles.

Comprehensive Assessment of the Effectiveness of the Application of Foam and Extruded Polystyrene in the Railway Substructure

“…That means that the contact interaction of the grains is neglected, and it is possible to determine the components of the initiated stresses between two uniform, perfect surfaces. On the (left) is an example of the long-term effect of different stress levels (30, 50, and 70%) from the EPS strength at 5% deformation on creep [33] and on the (right) is the effect of EPS/XPS moisture content on the thermal conductivity coefficient [34].…”

“…In parallel, leveraging the aforementioned experiential data, it is possible to define essential mechanical parameters for EPS boards deployed at the subgrade surface level. On the (left) is an example of the long-term effect of different stress levels (30, 50, and 70%) from the EPS strength at 5% deformation on creep [33] and on the (right) is the effect of EPS/XPS moisture content on the thermal conductivity coefficient [34].…”

“…Figure3. On the (left) is an example of the long-term effect of different stress levels (30, 50, and 70%) from the EPS strength at 5% deformation on creep[33] and on the (right) is the effect of EPS/XPS moisture content on the thermal conductivity coefficient[34].…”

Effectiveness Analysis of Insulation and Roof Covering Material in Office Flat Roof

“…(Cai et al, 2019) also provided evidence that green roof was effective in reducing EUI and room temperature. (Borras et al, 2022) Among the three types of roof renovation, showed a decrease in energy consumption by 9% to 13% 2 Thermal and energy performance of green roof and cool roof: A comparison study in Shanghai area (He et al, 2020) Cool roof was superior in reducing room temperature, resulted in more significant electricity savings compared to green roof 3 Inverted roof insulation kits and their durability (Francke and Gerylo, 2018) The decrease in the quality of insulation material was caused by freeze-thaw cycles.…”

Moisture Risk Analysis for Three Construction Variants of a Wooden Inverted Flat Roof

“…The heat loss of an inverted roof for different regions of Europe was described in [8,9]. The downside of this solution is the direct exposure of the insulation to the outdoor climate [10][11][12]. The risk of temperature decrease in the inner surface of the insulation below the dew point (resulting from the ingress of cold rainwater/melting snow going through the joints between the boards of thermal insulation) by specifying the ratio of the water undergoing the thermal insulation was studied in [13].…”