Precast wall section and method of building a wall

A method of building a wall using a plurality of free-standing wall sections comprising:

• a pre-cast concrete wall portion having a front face portion and a rear face portion, and end faces, the distance between the end faces defining a width of the wall portion;
• an upper connecting portion connecting said front face portion to said rear face portion at a top of said wall portion and defining a top edge or top surface of said wall section;
• a foot portion connecting the front and rear face portions at the base of the wall section and forming a solid base of the wall section, the foot portion extending beyond the front and rear faces of the wall portion, such that the thickness of the wall section at the base is greater than the thickness of the wall portion;
• a lower connecting portion connecting said front face portion to said rear face portion across the full width of the wall portion;
• a first cavity bounded by the front and rear face portions, the upper connecting portion and the lower connecting portion;
• a second cavity bounded by the front and rear face portions, the lower connecting portion and the foot portion;
• a first aperture in the upper connecting portion providing access to the first cavity for receiving concrete mix;
• a second aperture in the lower connecting portion providing a path between the first and second cavities for receiving concrete mix;
• and
• a recess on an inner face of each of the front and rear face portions, and a plurality of short reinforcing rods connected between corresponding recesses;
• the method comprising the steps of:
• placing a plurality of wall sections adjacent one another end to end such that the plurality of wall portions are aligned;
• and
• pouring concrete mix through the first aperture in an upper connecting portion in one or more of said plurality of wall sections until the cavities in each wall section are substantially filled.