An eco-wood formulation finds new uses as construction materials. A rigid polymer material sheet for use in building construction comprises a polymer mixture of ultrafine particles of polyvinylchloride (PVC) impact modifier, plant fiber, coupling agent, smoke suppressant, activated clay, lubricant, an activator, environmentally friendly flame retardant, heat stabilizers, odorless crosslinking agent, foaming agent, desmopressin agent. Alternatively, the rigid polymer material sheet is composed of: a polymer mixture of PVC, plasticizer, nitrile rubber, PCC, stearate, zinc oxide, retardant heat, heat stabilizers, crosslinking agent, vesicant; whereby said rigid polymer material sheet provides enhanced thermal resistance and sound attenuation properties for use in building construction, aviation and marine industries.