Abstract: Disclosed is a frame member for forming an opening through an insulating concrete form wall having opposed first and second forms. The frame member comprises an elongate member dimensioned to extend between the opposed forms. The elongate member is composed of a natural fiber plastic composite material having an opening forming surface and a wall forming surface and a pair of longitudinal retention fins extending from the wall forming surface. Each of the retention fins has a distal lip portion wherein the lip portions cooperate to form a hollow between the lip portions and the wall forming surface. Also disclosed is a frame for forming an opening through an insulating concrete form wall comprising at least three frame members and at least two corner connectors for connecting said frame members. The corner connectors comprise a bracket insertable into the hollows.