Abstract: A device and method for determining compliance with building construction codes comprises a block of material with a plurality of planar measuring surfaces separated by appropriate distances that are representative of a maximum or minimum gap space between a door and an adjacent structure, as permitted by industry standards. The appropriate measuring surfaces are inserted in the gap opening between the door and adjacent structure to be tested and quickly and easily indicate whether the gap meets building construction codes. The device functions as one tool to quickly check compliance of all gap openings related to door installations without hindrance from door installation hardware.

Abstract: An apparatus used to align door jambs and like structures. A base member comprises a substantially longitudinal section through which a channel is formed in the top surface thereof, one end extending into a first jamb spreader. A first extension member is slidably coupled within the channel of the base member, the extended end of the extension member depending into a second jamb spreader. A second extension member is slidably coupled within the channel of the base member opposite the first extension member, the end opposing the second jamb spreader depending into a third jamb spreader. The jamb spreader of the first and second extension members include horizontal and vertical leveling members. By positioning the opposed jamb spreaders against the opposed door jambs or surfaces, the alignment of the door jambs and door frame may be determined to be in square and plumb alignment.