IW 404 at sd H d Z CPH Cellulose - Cellulose-Insulation without Vapour Barrier - Investigations on the Fundamental Suitability of Sprayed-on and Plaster-covered Cellulose Insulation for Thermal Insulation of Buildings

Special attention concerning the use of interior insulation is given to the expected formation of moisture in the wall cross-section. Attempts were made to tackle this situation by means of a wide range of vapour barriers, but it soon became clear that branch lines and openings for building sections and deformations (e.g. wooden joist ceiling beam ends) pose a problem that is difficult to solve. Additionally the Glaser method provides an inadequate description of hygrothermic processes in the wall as it does not allow for capillary moisture transport in the various building materials. Based upon international research findings and a precursor HdZ-project the aim of this research work is to further develop conventional recycled paper cellulose flakes to create a sprayable, self-supporting, 3 - 8 cm thick body of insulation to be covered with an interior spray-on plaster that is open for diffusion. The aim is to avoid harmful water vapour condensation by taking advantage of the high sorption capacity and capillary conductivity of the cellulose fibres and to provide a failure-tolerant, inexpensive alternative to existing insulation systems, particular with regard to the renovation of existing (historically valuable) buildings (02/2003).