PVC Pressure Pipe and fittings are combustible materials, however, they may be installed in noncombustible buildings. In all cases the model building codes have determined that PVC must be protected at penetrations of walls, floors, ceilings and fire resistance rated assemblies. The method of protecting the pipe penetration is by a through penetration protection assembly that has been tested and rated in accordance with ASTM E814. This assembly must have been tested and given an "F" rating. The "F" rating must be a minimum of the hourly rating of the fire resistance rated assembly that the PVC plastic pipe penetrates. Verify local code interpretations related to through penetrations with the jurisdiction having authority.