Phonotherm® construction boards are made of high quality CFC-, HCFC- and Formaldehyde-free Polyurethane rigid foam (PU) residues. The material characteristics include water resistance, water permeability; insensitivity towards moisture and therefore prevention of putrefaction; isolation and insulation. Phonotherm® has a high stability despite low deadweight. The boards are produced in different dimensions and thicknesses.