Sash windows

A sash window assembly comprising:

• a window frame including a head member, a sill member and a pair of jamb members connected together into a rectangular configuration, the sill member comprising:
• (1) an exterior surface defining a first upper elongated channel and (2) a first elongated lower arm extending outwardly from the exterior surface, wherein the first elongated upper channel is disposed above the first elongated lower arm, a gap is defined between the first elongated upper channel and the first elongated lower arm, and an elongated protrusion extends substantially upwardly from a distal end of the first elongated lower arm;
• at least one sash having a sash frame including a top rail, a bottom rail and a pair of side rails connected together into a rectangular configuration, and a panel member disposed within the sash frame;
• and
• a sill nose facing member covering the exterior surface of the sill member and extending horizontally between opposite sides of the window frame, the sill nose facing member comprising:
• a vertical wall having an exterior surface and an interior surface, the interior surface of the vertical wall facing the exterior surface of the sill member, and the exterior surface of the vertical wall facing away from as the exterior surface of the sill member,
• an upper arm extending in a direction from an upper portion of the interior surface of the vertical wall, the upper arm comprising a second protrusion extending substantially downwardly from the upper arm, and
• a second lower arm extending in the direction from the interior surface of the vertical wall, the second lower arm being disposed below the upper arm and defining a second channel at a distal end of the second lower arm, the second channel extending substantially downwardly from the distal end of the second lower arm,
• wherein the second protrusion is disposed in the first elongated upper channel, the second lower arm is disposed within the gap between the first elongated upper channel and the first elongated lower arm, and the elongated protrusion extending from the first elongated lower arm is disposed in the second channel.