HUMIBATex

The rehabilitation of the existing buildings is a major stake to reduce of a factor the 4 gas emissions for purpose of greenhouse. So that this effort is authorized by all it is necessary to propose complete technical solutions (insulation, ventilation) and acceptable for the professionals. These solutions must bring answers to the energy reductions but also to the comfort of the occupants and the durability of the solution suggested. At the time of rehabilitations, the principal risk, badly apprehended at the present time as well in the practices as in the regulation, lies in a slow and irreversible degradation of certain components sensible to moisture (beams out of wooden, stones tender, old coatings, etc). This degradation can, in certain cases, to lead to the collapse of all or part of the building. Moisture was indeed always the enemy number one of the building. Moulds, rot of wood, corrosion of metals are among the current effects of the dangerous connections that maintains water with materials and the works. To bring viable solutions, our project falls under a step of energy restoration “total” of the park of existing buildings, by distinguishing the constructive times and modes (mainly “built old” on a side, “modern frame” of the other) and while seeking to couple the dependent aspects: - with the thermal improvement of the envelope (current walls and connections), - with the hydrous transfers through the envelope, - ventilation and the permeability to the air, - the consequences of the effects of moisture on the emissions of materials and the risks of moulds. This study proposes to produce a guide of assistance to the rehabilitation of the existing buildings by proposing adapted solutions. This guide will be accessible by the professionals from the building. To validate these solutions, a tool articulating the models and modules of simulations existing able to predict the power consumptions, the comfort of the occupants and the risks of pathologies related to moisture after restoration will be developed. This tool will be validated by in situ measurements before and after restoration on real and occupied buildings and by measurements on an experimental cell to build. The experimental cell will allow experiments in artificial climatic conditions, for better including/understanding the phenomena of transfers and in real climatic conditions. The data input being essential to simulations, a list of the characteristics necessary to the models will be carried out on the basis of element existing and supplemented if necessary by measurements directly on the products. The guide will be produced starting from the results of measurement of this study and will be supplemented by simulations of configurations suggested during the analysis of the existing built park. Thus the building owner or the project superintendent will have at his disposal a guide proposing of the checked and validated solutions of rehabilitation. If the guide is not sufficient, the tools developed in this study will make it possible to answer its request.