Patent ID: 8413333

Claim:
A method of manufacturing a construction element for use as an underlayment or backerboard, the method comprising: running a continuous web of impervious reinforcement membrane directly onto a conveyor belt; depositing a cementitious core material onto the web of impervious reinforcement membrane; disposing a reinforcement mesh onto the top surface of the cementitious core material; curing the core material; permanently adhering the web of impervious reinforcement membrane directly to the cementitious core material during the curing of the core material, the continuous web of impervious reinforcement membrane forming a bottom impervious non-cementitious surface of the construction element as the construction element is removed from the conveyor belt; and permanently adhering the reinforcement mesh to the top surface of the cementitious core material during the curing of the core material, the reinforcement mesh forming a top pervious cementitious surface of the construction element.