The DAMTEC® Multi underlay is a cost effective, 100% black rubber compound underlay which has a superior density of approx. 970kg/m3 allowing for all types of timber flooring to be adhered on top of a more rigid substrate and hence reducing the risk of deflection and movement in the timber floor under point load duress and therefore also enhancing the overall structural stability of the floor system. When assessing an appropriate underlay that is “fit for purpose” this critical point is often overlooked.