10-16-2006 Planning Commission Packet

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' A � #06-3240 Basement 8i Story Definitions - . October]2,2006 , Page 2 � The existing zoning code defiiiition of"walkout basenient"is: . • B�rseme�zt, i-i�alkoift, nieails a basenlent having an entrance at grade leveL The zoning code cioes not defuie "story". The zoning code defuies "building height" as: Buildi��g l�er.'glzt means fiiie vertical distance between the highest adjouiuig ground level at the building or teii feet above the lowest grouiid level, whichever is lower, a.ild tlie top of the cornice of a flat roof, or tlie deck line of a mausard roof, or the upperniost point oii a round or other arch-type roof, or tlie average lieight of the lugllest gable of a pitcheci or hipped roof. Topograpluc changes whicli elevate tlie adjoiniilg ground level above the existuig terrain shall not be considered in deterinining build'uig height. � Existing 2000 Tnternational Building Code Definitions � ' The definition of"baseiilent"iu the builduig code(2000 IBC)is: � Basement. That portioii of a builduig that is pa.rtly or completely below grade plane (See"Story above grade plane"). A basement shall be coiisidered as a story above grade plane wliere tlie finished surface of the floor above the basernent is: 1. More tlian 6 feet above grade plane; 2. More t11an 6 feet above the fiiushed grolmd level for more tlian 50% of tlie total building perimeter; or . 3. More than 12 feet above the finished ground level at any point. The 2000 IBC measures the lower point of building heigllt at the"grade�lane". The 2000 IBC , definitioii of"grade plane"is: ' Grade Plane. A refereiice plane representing tlie average of finislied ground level acljoining the Uuilding at exterior walls. Where the fiiushed ground level slopes away froni the exterior walls, the reference plaiie shall be established by the lowest points withiu the aiea between the Uuilding aiid the lot line or, where the lot line is inore than 6 feet fiom flie building, between the buildulg aiid 1 point 6 feet fioin the building. The 2000 IBC defiiies "story"as: Story. That portion of a buildiug included betweeii ihe upper surface of a floor and the upper surface of ilie floor or roof ne:ct above (also see"Basement"and"Mezzanine"). It is ineasured as the vertical distailce froni top to top of two successive tiers of bealns or finished floor surfaces and, for tlie topinost stoiy, froni the top of tlie floor f nish to tlie top of the ceiliiig joists�or, where there is not a ceiling,to tlie top of the roof rafters.