A method for installing a thermally broken, cast-in-place concrete slab comprising: bending a plurality of reinforcing shear rods at a first point to form a plurality of bent reinforcing shear rods; inserting the plurality of bent reinforcing shear rods through a plurality of angled reinforcing shear rod holes in a load-bearing, thermally insulating structural foam body configured to separate an interior concrete slab from an exterior concrete slab such that the first point angle is aligned with a first side of the insulating body; bending, while inserted in the insulating body, the plurality of reinforcing shear rods at a second point, the second point being aligned with a second side of the insulating body, wherein a first portion of each of the plurality of reinforcing shear rods extends substantially horizontally from the first side of the insulating body and a second portion of each of the plurality of reinforcing shear rods extends substantially horizontally from the second side of the insulating body; inserting a plurality of reinforcing tension rods through a plurality of reinforcing tension rod holes in the insulating body such that a first portion of each of the plurality of reinforcing tension rods extends substantially horizontally from the first side of the insulating body and a second portion of each of the plurality of reinforcing tension rods extends substantially horizontally from the second side of the insulating body; and pouring concrete over the plurality of reinforcing tension rods and reinforcing shear rods on both the first side and the second side of the insulating body to form the exterior concrete slab and the interior concrete slab. bending a plurality of reinforcing shear rods at a first point to form a plurality of bent reinforcing shear rods; inserting the plurality of bent reinforcing shear rods through a plurality of angled reinforcing shear rod holes in a load-bearing, thermally insulating structural foam body configured to separate an interior concrete slab from an exterior concrete slab such that the first point angle is aligned with a first side of the insulating body; bending, while inserted in the insulating body, the plurality of reinforcing shear rods at a second point, the second point being aligned with a second side of the insulating body, wherein a first portion of each of the plurality of reinforcing shear rods extends substantially horizontally from the first side of the insulating body and a second portion of each of the plurality of reinforcing shear rods extends substantially horizontally from the second side of the insulating body; inserting a plurality of reinforcing tension rods through a plurality of reinforcing tension rod holes in the insulating body such that a first portion of each of the plurality of reinforcing tension rods extends substantially horizontally from the first side of the insulating body and a second portion of each of the plurality of reinforcing tension rods extends substantially horizontally from the second side of the insulating body; and pouring concrete over the plurality of reinforcing tension rods and reinforcing shear rods on both the first side and the second side of the insulating body to form the exterior concrete slab and the interior concrete slab.