down the support 30 is then fastened to the subfloor 60 with nails or screws 22 through the four counter support corner holes 38 in the corners the closet flange 20 is then attached to the subfloor 60 with screws or nails 25 through the holes in the closet flange which coincide with the holes 39 or the loops 35 respectively in the support 30 or support halves 30 a 30 b according to one preferred embodiment the square support 30 or the stack of supports is attached on the subfloor 60 with glue or construction adhesive instead of nails or screws in case of a renovation project where a closet flange 20 is already installed the support 30 can be snapped into two equal halves 30 a and 30 b along the seams 36 now the support halves 30 a and 30 b can be easily slid into place from two sides shown in fig2 a squared and fastened to the floor similarly as described above according to one preferred embodiment a self adhesive water proofing membrane is added to the subfloor prior to the installation of the square support to better protect the subfloor from potential water damage from an improperly maintained toilet other advantage of this invention is that the square shape and counter sunk holes allow for a greater area of support for a positive reinforcement of the closet flange 20 to the subfloor 60 whereas in a new construction project if the hole cut through.