How to Remove Gyp-Crete From Concrete

Put on a dust mask and safety goggles. Open all of the windows in the room with the damaged Gyp-Crete.

Cut around the perimeter of the damaged area of Gyp-Crete, using an angle grinder with a concrete-cutting blade. An angle grinder's blade slices through the Gyp-Crete with little resistance and rides across the surface of the dense concrete subfloor below. Do not force the blade into the concrete subfloor.

Position a bolster chisel's blade about 1 inch from the angle grinder-cut edge of the damaged Gyp-Crete. Hold the bolster chisel at a right angle to the Gyp-Crete and strike the chisel's handle with a hammer until the edge of the Gyp-Crete breaks free of the concrete subfloor. Remove the broken piece of Gyp-Crete, exposing the concrete subfloor below.

Place the bolster chisel's blade on the exposed section of the concrete subfloor. Angle the chisel so its blade faces the damaged Gyp-Crete and its handle rests at a 45-degree angle away from the damaged Gyp-Crete.

Strike the bolster chisel's handle with the hammer, wedging the chisel's blade between the Gyp-Crete and the concrete subfloor. The damaged Gyp-Crete will crumble as the chisel slides across the concrete's surface. Discard the Gyp-Crete debris. Remove all of the damaged Gyp-Crete, using the same procedure.

Clean the dust from the concrete subfloor with a vacuum. The vacuum exposes the leftover pieces of Gyp-Crete that the bolster chisel's blunt blade missed.

Slide a floor scraper across the concrete subfloor, removing the leftover pieces of Gyp-Crete.