ILLUSTRATION OF THE UTAH STATE AMENDMENT

TABLE 1807.1.6.4 EMPIRICAL FOUNDATION DESIGN

ADDED TO THE 2018 IBC AND 2015 IRC

SECTION 2308.3.1 IBC and R403.1.6 IRC WITH UTA 15A-3-110 #2

FOUNDATION PLATES OR SILLS SHALL BE BOLTED OR ANCHORED TO THE FOUNDATION WITH NOT LESS THAN 1/2-INCH-DIAMETER (12.7 MM) STEEL BOLTS OR APPROVED ANCHORS SPACED TO PROVIDE EQUIVALENT ANCHORAGE AS THE STEEL BOLTS. BOLTS SHALL BE EMBEDDED NOT LESS THAN 7 INCHES (178 MM) INTO CONCRETE. THE BOLTS SHALL BE LOCATED IN THE MIDDLE THIRD OF THE WIDTH OF THE PLATE. BOLTS SHALL BE SPACED NOT MORE THAN 32 INCHES ON CENTER AND THERE SHALL BE NOT LESS THAN TWO BOLTS OR ANCHOR STRAPS PER PIECE WITH ONE BOLT OR ANCHOR STRAP LOCATED NOT MORE THAN 12 INCHES (305 MM) OR LESS THAN 4 INCHES (102 MM) FROM EACH END OF EACH PIECE. A PROPERLY SIZED NUT AND WASHER SHALL BE TIGHTENED ON EACH BOLT TO THE PLATE.

Empirical Foundation Wall & Rebar Layout Elevation
Empirical foundation wall and rebar layout elevation Technical elevation linework showing a reinforced foundation wall with a centered opening, footing, vertical and horizontal reinforcement, dimensions, and callout leaders. The live-text specifications below provide the detailed requirements. MAXIMUM 9'-0" WALL HEIGHT FOOTING TO BE 9" THICK AND 20" WIDE MINIMUM WALL HEIGHT RANGE TOP WALL BAR LINTEL DEPTH MAXIMUM OPENING WIDTH TOP WALL BAR TOP OPENING BARS SIDES OF OPENING BOTTOM OF OPENING CLEARANCE DIMENSIONS FOOTING DOWELS BOTTOM CLEARANCE DOWEL EXTENSION
Top & Wall Rebar Specifications
  • Top Wall Bar: 1 #4 REINFORCEMENT BAR TO BE WITHIN 4" OF TOP OF WALL. REF. FOOT NOTE (3)
  • Lintel Depth: LINTEL DEPTH, 2" FOR EACH FOOT OF OPENING WIDTH. MINIMUM DEPTH 6". REF. TABLE 1807.1.6.4 (6'x 2"=A 12" LINTEL DEPTH)
  • Top Opening Bars: 2 #4 REINFORCEMENT BAR REQUIRED TO BE 1-1/2" MIN., 2" MAX. FROM TOP OF OPENING AND EXTEND A MINIMUM OF 24" PAST OPENING SIDES. REF. FOOT NOTE (4)
  • Additional Horizontal Rebar: SPACE ADDITIONAL HORIZONTAL REINFORCEMENT EVENLY BETWEEN TOP AND BOTTOM BARS. REF. FOOT NOTE (3)
  • Top Horizontal Clearance: TOP OF FOUNDATION TO TOP HORIZONTAL BAR: 4" MAXIMUM. REF FOOT NOTE (3)
  • Top Vertical Clearance: TOP OF FOUNDATION TO TOP OF VERTICAL BAR: 3" MAXIMUM. REF FOOTNOTE (2)
Opening Reinforcement Specifications
  • Maximum Opening Width: 6'-0" MAXIMUM OPENING WIDTH WITHOUT ENGINEERING REF. TABLE 1807.1.6.4
  • Clearance Dimensions: 2'-0" MIN. | 1'-0" | 2" MAX. | 2"
  • Sides of Opening: 1 #4 REINFORCEMENT REQUIRED 1-1/2" MIN., 2" MAX. FROM SIDES OF OPENING AND MUST EXTEND 24" MINIMUM PAST THE OPENING BOTTOM AND TO WITHIN 3" OF THE TOP OF THE FOUNDATION WALL. THE STANDARD WALL REINFORCEMENT MAY FULL FILL THIS REQUIREMENT. REF. FOOT NOTE (4)
  • Bottom of Opening: 1 #4 BAR TO BE PLACED WITHIN 2" OF THE BOTTOM OF THE OPENING AND EXTEND A MINIMUM OF 2'-0" BEYOND THE OPENING EDGE. REF. TABLE 1807.1.6.4 AND FOOTNOTE (4)
Wall Height & Vertical Rebar Spacing

MAXIMUM 9'-0" WALL HEIGHT

Wall Height Range Vertical Bar Spacing Rule
32" UP TO 4' TALL WALLS (32" FOR 4' WALLS OR LESS SEE NOTE 2) 32" O.C.
4'-1" TO 8' WALLS (24" IF 4' < 8' TALL WALLS) 24" O.C. (1'-4")
24" FOR 9' WALL (16" IF 8' < 9' TALL WALLS) 16" O.C.
Footing & Dowel Requirements
  • Footing Dowels: FOOTING DOWEL WITH STANDARD 90° BEND, DOWELS OF #4 BAR AT 32 INCHES ON CENTER SHALL BE PROVIDED IN THE FOOTING, EXTENDING 18 INCHES (457 MM) INTO THE FOUNDATION WALL. REF. FOOT NOTE (5)
  • Dowel Extension: FOOTING DOWEL MINIMUM EXTNETION INTO WALL = 18".
  • Footing Dimensions: FOOTING TO BE 9" THICK AND 20" WIDE MINIMUM. REF. FOOT NOTE (7) (9" Thickness)
  • Bottom Clearance: BOTTOM REINFORCEMENT BAR TO BE WITHIN 4" OF TOP OF FOOTING REF. FOOT NOTE (3)

NOTE: THIS AMENDMENT ELIMINATES THE HORIZONTAL REINFORCEMENT IN THE FOOTING.

NOTE: (8) SOIL BACKFILL SHALL BE SOIL CLASSIFICATION TYPES GW, GP, SW, OR SP, PER TABLE 1610.1. SOIL SHALL NOT BE SUBMERGED OR SATURATED IN GROUNDWATER.