2003 APRIL - Laserfiche WebLink

20.52.090 for exterior bearing walls and ten inch- es (10") for adobe partitions. No adobe structure shall exceed one story in height unless the historic evidence satisfactory to the director of building inspection and the director of planning indicates a two-story height. In such cases the height to thickness ratio shall be the same as above for the first story based on the total two-story wall height, and the second floor wall thick- ness shall not exceed the ratio of five to one (5:1) by more than twenty per- cent (20°Io). Bond beams shall be pro- vided at the roof and second floor lev- els. 2. Foundation footings shall be rein- forced concrete under newly recon- structed walls and shall be fifty percent (50°Io) wider than the wall above, soil conditions permitting, except that the foundation wall may be four inches (4") less in width than the wall if rock, burned brick or stabilized adobe facing is necessary to provide authenticity. 3. New or existing unstabilized brick and adobe brick masonry shall test to seventy five percent (75oIo) of the com- pressive strength required by the uni- form building code for new material. Unstabilized brick may be used where existing bricks are unstabilized and where the building is not susceptible to flooding or direct exposure to the weather. Adobe may be allowed a max- imum value of three (3) pounds per square inch for shear with no increase for lateral forces. 4. Mortar may be of the same soil composition and stabilization as the brick in lieu of cement mortar. 5. Nominal tension stresses due to seismic forces normal to the wall may be neglected if the wall meets the thickness requirements and shear values allowed by this subsection. C. Archaic Materials: Allowable stresses for archaic materials not speci- fied in the state historical building code shall be based on substantiating re- search data or engineering judgment with the approval of the director of building inspection. (Ord. 1563 § 1, 1992) (Pleasanton April 2003) 734-6