Facade Insulation Systems Using Polyethylene Foam: Fid-Bau Portal

Facade Insulation Systems Using Polyethylene Foam

Mednikova, E. A. / Ter Zakaryan, К. A. / Ter Zakaryan, A. К. / Efimov, B. A. / Medvedev, A. A.

Foamed polymers are one of the most effective and reliable types of thermal insulation. The area of use of materials of this group can become much broader if their combustibility decreases. This is achievable by chemically modifying the polymer matrix, introducing finely milled mineral flame retardants into the matrix, replacing the flammable foaming agent with inert ones and, in particular, with CO₂. It is possible to use products in which the core of combustible polyethylene foam is protected by a film of non-combustible modified polymer with flame retardants introduced.

The purpose of the research presented in the article was to study the possibility of implementing facade systems within the framework of existing design solutions using polyethylene foam. The study of the material properties was carried out according to standard methods. As a result, it was found that the tensile strength in the longitudinal direction of the polyethylene foam samples is 80–92 kPa, and the strength of the weld is 29–32 kPa. Polyethylene foam with an average density of 18–20 kg/m³ has a thermal conductivity of 0.032–0.034 W/(m $\cdot$ \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\cdot$$\end{document}K), diffusion moisture absorption without a metalized coating is 0.44 kg/m², and with a coating of 0.37 kg/m²; water absorption at partial immersion in water for 24 h–0.013 kg/m²; water absorption by volume when wholly immersed in water for 28 days 0.96%. The material practically does not change its properties under conditions of long-term alternating temperature changes from −60 to +70 °C.

In the case of new construction and reconstruction of facades, insulation is carried out along the outer contour, followed by cladding with facade products fixed on vertical rails. It is possible to implement facade heat-insulating composite systems with external plaster layers arranged along with the reinforcing mesh. With new construction, it is possible to use methods of layered combined masonry. Depending on the thickness of the thermal insulation, the heat transfer resistance of layered structures ranges from 3.2 m²°C/W or more.