Building Inspection Division Hand Outs General Notes: Exterior beams shall be a minimum depth below natural and finish grades of 6”. (Exception: when exterior beams are placed on a compacted fill of 90% standard proctor density. Beams shall not be required to extend below natural grade, but shall be required to extend below finished grade a minimum of 6” and a minimum of 6” into the compacted fill.) All concrete shall be of a design mix to have a 28-day compressive strength of 3,000 psi. Dead end beams not allowed except for corner support beams. All beam and slab reinforcing shall maintain minimum clearance of 2” from exterior forms on sides. All beam and slab reinforcing shall maintain minimum clearance of 3" from bottom of beam. Beam reinforcing shall be tied and supported every 4’-0” minimum. Corner reinforcing steel (bars) are required at all perimeter beams top and bottom (T. & B.). LAP splices shall be in accordance with the following:
Anchor bolts - spacing 6’-0” O. C. (on center) maximum, 12” from corners, 1/2”x8” minimum size bolts. Provide chairs or other suitable supports for slab and beam reinforcing. All reinforcing except #3 reinforcing steel shall conform to ASTM grade 60-type steel. #3 reinforcing steel may be grade 40. Minimum slab thickness to be 4” and minimum reinforcing to be #3 bars at 18” both ways (B. W.). Beam sizes, spacing and reinforcing steel (bars) shall conform to the following minimum requirements:
Foundations for structures resting on soils with an expansion index greater than 25 as determined by UBC Standard 18-2, shall require special design consideration. Refer to 1994 UBC Section 1803.2 A Foundation Plan will be required for all construction. Two Story Construction:
Staff Contacts: Concrete Foundations Sample Plan (PDF - 714KB) |
