In the selection of panels for thermal insulation we should take care to insulation properties and the impact on user comfort. We can choose between synthetic (mineral wool, polystyrene, polyurethane, foam glass, etc,) and natural (wood fibers, cork, coconut fiber, straw, cellulose fibers, etc,) thermal insulating materials. In most cases, cellulose fibers are installed with blowing technology. We wanted to determine the effect of thickness and density of cellulose boards made of cellulose fibers. We have produced a variety of 6 plates of different thicknesses between 4 mm and 150 mm and different density, between 57 kg /m3 and 770 kg/m3. We found that the density and thickness, typically affect the thermal transition. The best insulating properties had panel with the lowest density and a maximum thickness, while the worst results were revealed by panels with a high density and a small thickness
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