Abstract: A notch slightly larger than the diameter of the pipe or conduit is cut into the edge of a stud or joist and the pipe is installed, fitting into the notch. A reinforcement is provided consisted of a plate and a split plastic sleeve, which may be bonded together or formed integral. The plate is nailed to the face of the studs or joist, bridging the notch and lying at right angles to the pipe. The sleeve is pulled apart to fit around the pipe and connected together by a staple bridging the split or by nailing a protruding ear to the stud. The sleeve is preferably thin-walled and stiffened by radially-inward protruding ribs.