## 1 Introduction
PEG was dissolved into water and impregnation was achieved by soaking the samples into the solution at atmospheric pressure. They obtained a composite with a melting point of 26.74 \({}^{\circ}\)C and a latent heat of 73.59 J/g. They applied a surface coating to retain the PCM within the wood and conducted leaching tests. About 15% of the initial PEG content leached out after being immersed in water for two weeks [26]. In 2017, [PERSON] et al. impregnated wood with paraffinic PCMs RT-21 and RT-27 from Rubitherm\({}^{\circledR}\)[27]. They measured a latent heat of 20.62 J/g for a weight proportion of PCM of 29.9%. They applied a polystyrene solution in organic solvent to prevent the composite from any leakage when the PCM is in the liquid state. Sealing wood as they did can be hazardous as wood is a material that can undergo dimensional changes. In 2017, [PERSON] et al., conducted a kinematic characterization of the pressure-dependent PCM impregnation process for radiata pine wood samples [28]. They used octadecane, a paraffinic PCM. The impregnation of wood was achieved without applying any vacuum; the octadecane was forced deep into the wood under high pressure. They obtained a composite with a final PCM content of maximum 65.5%. Composite stability was not assessed. It is highly possible that the PCM will leach out from the composite when in liquid state. In order to avoid this phenomena, PCM could be microencapsulated before the wood impregnation. Not any experiment of wood impregnation with PCM microcapsules seems to be referenced in literacy. Engineered wood flooring (EWF) is a widely used floor covering solution. It can have different shapes but in most cases EWF is made of two parts: the lamella and the substrate. The substrate role is to ensure the mechanical strength of the assembly. It is also the thickest part; therefore it is usually made with a lower cost material than the lamella. The substrate can be made of MDF, HDF, plywood, particleboard, or solid wood. The lamella is the aesthetic face layer of the wood that is visible when installed, it is usually a sawn piece of timber. Sometimes a third layer is added; the counterbalancing layer that will enhance the mechanical properties of the assembly, specifically in order to avoid the bending. For this article, only the lamella was considered for impregnation, it is made from sawn timber. Thus, its porous microstructure could make possible the impregnation. Furthermore, it is the layer facing the interior air of the house, directly receiving the solar radiation for a maximum heat transfer. As if wood has a low thermal conductivity and can sometimes be considered as an insulation material, such an assembly with a PCM integrated in the innermost layer of the floor could higher the floor thermal mass and allow a sufficient thermal exchange. Within a house, the floor receives a high quantity of solar energy. However, wood is a material often used as a flooring solution and embodies a limited thermal mass. In 1999, two-thirds of floor covering made of wood in Europe was EWF [29]. Consequently, impregnating EWF with PCM could enhance buildings' thermal mass and lead to energy efficiency and thermal comfort enhancements. This study aims on assessing the potential of impregnating wood with PCMs in order to make high thermal mass EWF.