Section R. 408.40203 - DefinitionsRule 203.
(1) "Base" means the supporting surface that the masonry wall is laid upon.(2) "Competent person" means a person who is trained, experienced, and capable of identifying existing or potential hazards in surroundings, or under working conditions, that are hazardous or dangerous to an employee and who has the authority and knowledge to take prompt corrective measures to eliminate the hazards.(3) "Controlling contractor" means a prime contractor, general contractor, construction manager, or any other legal entity that has the overall responsibility for the construction of the project including its planning, quality, and completion.(4) "Initial period" means the period of time, not to exceed 24 hours, during which the masonry wall is being laid above its base or the highest line of bracing and, at the end of which, required bracing is installed.(5) "Intermediate period" means the period of time following the initial period until the masonry wall is connected to the structural elements that provide its final lateral support.(6) "Qualified person" means a person who, by possession of a recognized degree, certificate, professional standing, or by extensive knowledge, training, and experience, has successfully demonstrated the ability to solve or resolve problems relating to the subject matter, the work, or the project.(7) "Reinforced masonry" means a masonry wall made up of units laid in mortar with steel reinforcement embedded in grout.(8) "Restricted zone" means the area on each side of a masonry wall measured by a horizontal distance equal to the height of the constructed wall plus a minimum of 4 feet, measured at right angles to the wall, and continuing for the length of the wall plus a minimum of 4 feet beyond the ends of the wall.(9) "Structural designer of record" means a registered or licensed professional who is responsible for the structural design of the project.(10) "Unreinforced masonry" means a masonry wall made up of units laid in mortar that may contain horizontal joint reinforcement.(11) "Unsupported masonry wall" means a masonry wall that has not obtained its final lateral support from structural elements, such as, but not limited to, roofs, floors, buttresses, crosswalls, and piers.(12) "Wall bracing system" means a brace consisting of vertical, diagonal, and/or horizontal structural elements which provide support to the unsupported masonry wall.(13) "Wind-measuring device" means an instrument which accurately measures wind speed to + 2 miles per hour.(14) "Wind speed" means the velocity of a 3-second gust.Mich. Admin. Code R. 408.40203