Plastering on Top of Additional Insulation: Ten Experimental Construction Projects for Testing Different Methods

摘要

A large part of the existing building stock in Sweden in need of additional thermal insulation has rendered facades. It is estimated that over 25% of the total facade surface area of buildings erected before 1960 is rendered. As buildings of this age often have relatively poor thermal insulation, it follows that there is a considerable need for methods of applying additional thermal insulation to rendered buildings. A basic requirement for such methods should be that the building should retain a rendered surface after the application of additional insulation. This means that methods of applying rendering to additional insulation must be developed, thus enabling additional external insulation to be applied without degrading the original urban environment. The application of plaster to additional thermal insulation involves a number of technical problems, which are summarised and described in Chapter 5. Up to now, only limited experience of applying plaster to additional thermal insulation has been available. However, it should be pointed out that experiments in applying plaster to insulation have been carried out on a limited scale in Sweden since the 1940s. During recent years, several companies and development groups have worked on the problem and a number of systems are now available. In order to build up further experience, the Swedish Council for Building Research has started an experimental building project involving the participation of ten companies, each using their own plastering system. These different systems are described in Chapter 6. Chapter 7 describes a test and evaluation program which will be used for the assessment of all projects.