How to Anchor a Toilet to a Cement Floor

Concrete floors have different physical properties than tile or other materials, so you must use special tools and fasteners to anchor a toilet to a concrete floor. Concrete screws work well in concrete that is not crumbling or falling apart. When driving the screws into the concrete, beware that the screws are dense enough they may break a screwdriver or a drill’s screw head tip.

Closet flange
Marker
Drill with diamond or carbide-tipped bit
Concrete screws
Closet bolts and washers
Wax ring
Closet nuts
Adjustable wrench

Instructions

- 1
  Place the closet flange onto the concrete floor, around the waste pipe opening. Mark the locations of the screw holes in the flange on the floor using a marker, and then remove the closet flange.
- 2
  Drill pilot holes in the concrete where you marked with the marker, using a carbide or diamond-tipped drill bit. Place the closet flange back on the floor, lining the guide holes you drilled up with the holes in the flange.
- 3
  Drive concrete screws into the pilot holes you made using a screw bit attachment. Tighten the screws into the concrete floor so the screw heads sit flush against the top of the closet flange.
- 4
  Insert closet bolts into the slots in the closet flange, and slide washers over the bolts. Press a wax flange onto the bottom of the toilet, around the drain opening, with the rounded side against the toilet.
- 5
  Lower the toilet over the flange so the bolts go through the holes in the toilet’s base. Slide washers over the closet bolts. Press down on the toilet bowl as you tighten the nuts onto the closet bolts, stopping once the toilet does not rock in any direction.

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