Prefabricated modified polymer-bitumen membrane composed of distilled bitumen and elasto-plastomers (APP) reinforced with a woven non woven single strand composite polyester fabric. The upper face of the membrane is coated with the waterproofing mass and protected with a PE film, while the lower face is the exposed reinforcement. The woven non woven single strand composite polyester reinforcement offers excellent static puncture and tear strength resistance. The characteristics of the membranes in the MONOTEC range allow them to be used with success as a regularisation layer, as a first layer mechanically fixed to wooden roofs, as a vapour diffusion layer, as a separation layer between bituminous membranes and synthetic ones as well as in several other applications. In virtue of the particular formulation the membranes of the MONOTEC range are compatible with all the PLUVITEC membranes, both APP and SBS.