Apparatus and techniques for bracing roll down doors of a building against severe winds and against burglary use a vertical bar mounted in a quick release fashion to a plate mounted to the floor by the door and a mounting bracket, mounted to the building, which receives a bracket mounted to the vertical bar which slides into the bracket. The equipment can be provided in a kit form for easy installation by a homeowner, authorized dealer or contractor. The apparatus can be quickly and easily installed for security or when a threat of severe wind is anticipated and easily removed when the threat has passed.