Title 16 - Buildings and Construction

16.110 Residential Code for One- & Two-Family Dwellings

16.110.R401.2

Section R401.2 of the International Residential Code for One- and Two-Family Dwellings is hereby amended to read as follows:

 

R401.2 Requirements.

R401.2 Requirements. Foundation construction shall be capable of accommodating all loads according to Section R301 and of transmitting the resulting loads to the supporting soil. Fill soils that support footings and foundations shall be designed, installed and tested in accordance with accepted engineering practice. Gravel fill used as footings for wood and precast concrete foundations shall comply with Section R403. Foundations that are designed in compliance with the Johnson County Foundation Guideline endorsed by the Johnson County Building Officials Association dated October 1, 2007 shall be considered as an approved alternative to compliance with this chapter.

R401.2.1 Design required. A design in accordance with accepted engineering practice shall be provided for concrete or masonry foundation walls when any of the conditions listed below exist.

  1. 1.
    Walls are subject to hydrostatic pressure from ground water.
  2. 2.
    Walls supporting more than 48 inches (48”) of unbalanced backfill that do not have permanent lateral support at the top and bottom.
  3. 3.
    Sites containing CH, MH, OL, or OH soils as identified in Table R405.1
  4. 4.
    Foundation walls exceeding ten feet (10’) in height, measured from the top of the wall to the bottom of the slab.
  5. 5.
    Lots identified on the subdivision grading plan as having more than six feet (6’) of fill or having a finished slope steeper than 4 horizontal to 1 vertical before grading.
  6. 6.
    Footings and foundations with existing fill soils below the footing level.
  7. 7.
    Sloping lots steeper than 4 to 1 before grading.
  8. 8.
    Lots where some footings will bear on soil and others will bear on rock.
  9. 9.
    Areas where problems have historically occurred.
  10. 10.
    Stepped footing and foundation walls.

R401.2.2 Continuous footing reinforcement. Continuous footings for basement foundation walls shall have minimum horizontal reinforcement consisting of not less than two No. 4 bars, uniformly spaced, located a minimum 3 inches (3”) clear from the bottom of the footing.

R401.2.3 Foundation anchorage. The spacing of anchor bolts or foundation anchor straps required by Section R403.1.6 shall be reduced to a maximum of 3 feet (3’) on center for basement foundation walls.

(History: Ord. BC-3286 §63, 2020; Ord. BC-2936 §44, 2012; BC-2635 §§63, 64 & 65, 2007; BC-2459 §§45, 47 & 48, 2004; BC-2237 §2, 2001)

Effective on: 1/1/1901