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• SPECIAL DETAILED REQUIREMENTS BASED ON USE AND OCCUPANCY kir in height represent similar hazards to those of high- be properly sealed or otherwise made waterproof. rise buildings. This requirement prevents the chances of a fire or 412.35 Accessibility.Airport traffic control towers need not other liquids and vapors from seeping into the Floor be accessibleas specified in the provisions of Chapter 11. construction and leaking into the basement level.Fur- ther, the code prohibits any openings or access +Airport traffic control towers are not required to have between the main level of the hangar and the base- an accessible route to the cab and the floor immedi- ment level. This would include fire-resistance-rated ately below the cab (see Section 1104.4, Exception shafts. Any opening into the basement has to be 3). Other areas of the control tower are typically made from the exterior of the structure via areaway employee work stations,which must be connected by construction. an accessible route so that such stations can be 412.4.3 Floor surface.Floors shall be graded and drained to approached, entered and exited (see Sections prevent water or fuel from remaining an the floor. Floor 1103.2.3 and'110A.3])' drains shall discharge through an oil separator to the sewer or 412.9 Aircraft hangars. Aircraft hangars shall he in actor- to an outside vented sump. dance with Sections 412,4.1 through 412.4.6. Exception: Aircraft hangars with individual lease spaces +The requirements of Section 412.4 address commer- not exceeding 2,000 square feet (186 m9 each in which cial (or nonresidential) aircraft hangars. It should be servicing. repairing or washing is not conducted and fuel noted that most commercial aircraft hangars will not is not dispensed shall have floors that are graded toward be limited in height in terms of feet (see Section the door,but shall not require a separator. 504.1) or in area (see Section 507) based on the �,These provisions go hand in hand with the waterproof presence of an automatic sprinkler system. All corn- requirements of Section in g. The floors of all mercial aircraft hangars, however, must be regulated hangars must be positivelysloped to prevent in regards to exterior wall fire-resistance ratings, g p stand- basement limitations, floor surface construction ing liquids. This requirement is not only for personnel requirements, heating equipment separation and fin- safety but also to minimize the effects of any spilled fishing restrictions. All of these provisions serve to flammable liquids. Floor drains, if provided,must dis- abate the hazards associated with large aircraft and charge their contents into an oil separator or an out- their integral fuel tanks to acceptable fire safety ley- side sump. This prevents the flammable liquids from els entering the jurisdiction's sewer system and causing additional hazards. 412.4.1 Exterior walls. Exterior wails located less than 30 An exception has been included for those commer- ce feet (9144 ram} from lot lines or a public way shall have a cial aircraft hangars that are divided into individual fire-mslszance rating not less than 2 hours. tenant or lease spaces. Hangars with tenant or lease +To abate the hazards of a fire condition from spread- spaces of 2,000 square feet (186 m2 or less in area ing from a commercial aircraft haugaLto adjacent do not pose the same overall hazard. The likelihood buildings and structures, the code requires exterior of all the aircraft being used at the same time is walls that are located less than 30 feet (9144 mm) remote: therefore, Ihe hazard of ponding water or from lot lines or public ways to have fire-resistance- spilled fuel is remote. The floor surfaces of small air- rated construction of not less than 2 hours. Fire-resis- craft hangar tenant or lease spaces only need to be trace-rated exterior walls permit the fire department sloped towards the main exterior wall openings. It is additional time and protection as it attempts to take imperative that no other servicing, repair work or air- control of a fire situation in a hangar located less than craft washing is done and that no fuel dispensing can 30 feet(9144 mm)from the lot lines or public ways. occur in these small tenant lease spaces. 412.4.2 Basements. Where hangars have basements, floors 412.4.4 Heating equipment. Heating equipment shall be over basements shall be of Type IA construction and shall be placed In another room separated by 2-hour lire barriers con- made tight against seepage of water,oil or vapors.There shall strutted in accordance with Section 707 or horimntal assem- be no opening or communication between basements and the Niles constructed in accordance with Section 711, or both. hangar.Access to basements shall be from outside only. Entrance shall be from the outside or by means of a vestibule 8-As part of the hangar requirements,the use and sep- Providing a two-doorway separation. aration of any basement levels are rigidly controlled. Exceptions: A fire in the main level of a hangar could pose a I. Unit heaters and vented infrared radiant heating severe hazard not only to the occupants of base- equipment suspended not less than 10 feet (3048 ments but also to the fire department itself. The floor/ mml above the upper surface of wings or engine ceiling assembly located between the hangar and the enclosures of the highest aircraft that are permitted first basement level below must be of Type IA con- to be housed in the hangar need not be located in a situation. with a floor of 2-hour foe-resistance-rated separate room provided they are mounted not less construction along with the supporting construction, a than 8 feet (2438 ram) above the floor in shops. fire on the main level should be contained. Not only is offices and other sections of the hangar communi- the¶oor construction required to be rated,but 11 must rating with storage or service areas. Le a-85 2012 INTERNATIONAL BUILDING CODE'COMMENTARY