Abstract: A wall panel (10) for use as a foundation and upper wall is disclosed. The wall panel (10) comprises a plurality of spaced first framing members (11) having top ends, (11a) bottom ends (11b), first edges (11c) and second edges (11d). A plurality of spaced second framing members (12), having top ends (12a), bottom ends (12b), first edges (12c) and second edges (12d) are provided. The spacing between the first framing members (11) is substantially equal to the spacing between the second framing members (12). The bottom ends (12b) of the second framing members (12) are positioned on top of the top ends (11a) of the first framing members (11). Means for fastening the first framing members (11) to the second framing members (12) are provided. Foundation grade treated sheathing (17) are cooperatively connected to the first edge (11a) of the first framing members. External sheathing (18) is cooperatively connected to the first edge (12c) of the second framing member (12).