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The insight that hydrophobization should be regarded as a possible element in the spectrum of internal insulation solutions triggered the midway introduction of RIBuild’s Task 2.4 ‘Impact of water repellent agents on hygric material properties’ and this deliverable reports the findings of that task. While giving much new knowledge and insights in regard to water repellent agents and hydrophobization, it also reveals that the results and outcomes show significant limitations and incongruences still, and that much more work thus is needed before hydrophobization can be reliably considered as part of the solution spectrum for moisture damages possibly resulting from application of internal insulation. Therefore, the findings of Task 2.4 have not resulted in adopting hydrophobization in the simulation campaign for the webtool of RIBuild’s WP6. ispartof: pages:1-159 status: Published online

This report comprises a study of material threshold values, failure modes and related failure prediction models to enable an evaluation of adding internal insulation in historic brick buildings. Threshold values and prediction models have been investigated both within literature and through laboratory study, by for instance comparing prediction models to real field results and by testing threshold values in laboratory. The aim of this report is to find threshold values and suitable and reliable prediction models to be included in the decision guidelines and the web tool, which are the final outcomes of the RIBuild project. Failure modes included in the report are mould growth on building materials, rot and wood decay, frost damage and discoloration of facades. ispartof: pages:1-155 status: Published online