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FCBA, the French BERTIM Partner, will be the representative of the project's idea during the International Green Building Conference, Singapore, 5 - 7 September 2018. The article entitled: "HYDROTHERMAL PERFORMANCES OF PREFABRICATED TIMBER MODULES FOR BUILDING RETROFITTING" has been prepared to be presented during the Congress.



This paper presents hygroscopic and thermal performance of the BERTIM modules according to different types of existing buildings and climatic conditions.

BERTIM project, “Building Energy Renovation through Timber Prefabricated Modules” develops a set of timber envelop components with the dual purpose of adding thermal insulation and incorporating HVAC duct and pipework in the building envelope within building envelope renovation projects.

Within its work program, a full-scale test has performed in a test facility in TECNALIA Bilbao, Spain. The environment, that this wall assembly has faced, represents conditions of an actual building, as built and in service, as opposed to controlled laboratory conditions. Afterwards, the system will be implemented in three real demo buildings in different climatic zones: Spain, France and Sweden. BERTIM project will present technical justification for validating the detailed design of the system in order to assure that the developed modules will comply with the conditions to achieve the Building Product Regulation Requirements : Mechanical resistance and stability, Safety in case of fire, Hygiene, Health and the environment, Safety and accessibility in use, Protection against noise, Energy efficiency and thermal performances and Sustainable use of natural resources, in addition to economic aspects and other important aspects in the public interest and acceptance.

The BERTIM modules design fulfil high insulation level, complying with regulations and with the objective of achieving energy consumption reduction of at least 60%.

Different products and layers in the panel are checked up in induced thermal bridges calculation, which could reduce the thermal performance of the modules. In addition, hygroscopic analysis is based onhygroscopic simulations including the degradation risks especially for BERTIM panel with installations. It is the justification of availability of the 2D-modules experiments according weather conditions.

Indeed, finding water in liquid form in materials can be normal. A relatively dry material only receives water in its vapor phase. Material in a "normal" atmosphere can accommodate, in addition to the vapor phase, the liquid phase. This is generally the case for so-called hygroscopic materials (e.g. wood andderived materials). However, under conditions of very high humidity, there is a large presence of liquidwater, which is to avoid in the risk of structural deterioration of the wall, internal discomfort: greater risk of condensation on the inner wall, risk of frost, risk of fungal development and deterioration of the wall qualities in terms of thermal insulation.



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