// CODE SNIPPET
R403.4 Footings for Precast Concrete Foundations
JUMP TO FULL CODE CHAPTER
Footings for precast concrete foundations shall comply with Section R403.4.

BASEMENT OR CRAWL SPACE WITH PRECAST FOUNDATION WALL BEARING ON CRUSHED STONE

BASEMENT OR CRAWL SPACE WITH PRECAST FOUNDATION WALL ON SPREAD FOOTING
MINIMUM DEPTH (D) AND WIDTH (W) OF CRUSHED STONE FOOTINGSa, b (inches)
NUMBER OF STORIES |
UNIFORM WALL LOAD |
DEPTH(D) AND WIDTH (W) |
LOAD-BEARING VALUE OF SOIL (psf) | |||||||||||||||||
1500 | 2000 | 2500 | 3000 | 3500 | 4000 | |||||||||||||||
MH, CH, CL, MLc | SC, GC, SM, GM, SP, SWc | GP, GWc | ||||||||||||||||||
Wall width (inches) | Wall width (inches) | Wall width (inches) | Wall width (inches) | Wall width (inches) | Wall width (inches) | |||||||||||||||
8 | 10 | 12 | 8 | 10 | 12 | 8 | 10 | 12 | 8 | 10 | 12 | 8 | 10 | 12 | 8 | 10 | 12 | |||
Conventional light-frame construction | ||||||||||||||||||||
1-story | 1100 plf | D | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
2-story | 1800 plf | D | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 15 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
3-story | 2900 plf | D | 14 | 12 | 10 | 9 | 7 | 5 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 25 | 24 | 24 | 19 | 19 | 18 | 15 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
4-inch brick veneer over light-frame or 8-inch hollow concrete masonry | ||||||||||||||||||||
1-story | 1500 plf | D | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
2-story | 2700 plf | D | 12 | 11 | 9 | 8 | 6 | 4 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 22 | 23 | 23 | 18 | 17 | 17 | 14 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
3-story | 4000 plf | D | 21 | 20 | 18 | 14 | 13 | 11 | 10 | 8 | 7 | 7 | 6 | 4 | 5 | 4 | 4 | 4 | 4 | 4 |
W | 33 | 34 | 33 | 25 | 26 | 25 | 20 | 20 | 21 | 17 | 17 | 17 | 14 | 15 | 17 | 13 | 15 | 17 | ||
8-inch solid or fully grouted masonry | ||||||||||||||||||||
1-story | 2000 plf | D | 7 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 17 | 17 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
2-story | 3600 plf | D | 19 | 17 | 15 | 12 | 11 | 9 | 9 | 7 | 5 | 6 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
W | 30 | 30 | 30 | 22 | 23 | 23 | 19 | 19 | 18 | 15 | 15 | 17 | 13 | 15 | 17 | 13 | 15 | 17 | ||
3-story | 5300 plf | D | 30 | 29 | 27 | 21 | 19 | 18 | 16 | 14 | 12 | 12 | 10 | 8 | 9 | 8 | 6 | 7 | 6 | 4 |
W | 43 | 44 | 44 | 33 | 32 | 33 | 27 | 27 | 26 | 22 | 22 | 22 | 19 | 20 | 19 | 17 | 17 | 17 |
For SI: 1 inch = 25.4 mm, 1 plf = 14.6 N/m, 1 pound per square foot = 47.9 N/m2.
- Linear interpolation of stone depth between wall widths is permitted within each Load-Bearing Value of Soil (psf).
- Crushed stone must be consolidated in 8-inch lifts with a plate vibrator.
- Soil classes are in accordance with the Unified Soil Classification System. Refer to Table R404.5.1.
Clean crushed stone shall be free from organic, clayey or silty soils. Crushed stone shall be angular in nature and meet ASTM C33, with the maximum size stone not to exceed 1/2 inch (12.7 mm) and the minimum stone size not to be smaller than 1/16 inch (1.6 mm). Crushed stone footings for precast foundations shall be installed in accordance with Figure R403.4(1) and Table R403.4. Crushed stone footings shall be consolidated using a vibratory plate in not greater than 8-inch (203 mm) lifts. Crushed stone footings shall be limited to Seismic Design Categories A, B and C.
Related Code Sections
R403.4 Foundations, Footings for Precast Concrete Foundations
Footings for precast concrete foundations shall comply with Section R403.4.
FIGURE R403.4(1)
BASEMENT OR CRAWL SPACE WITH PRECAST FOUNDATION ...
Residential Code 2018 of Kansas > 4 Foundations > R403 Footings > R403.4 Footings for Precast Concrete Foundations
R402.3 Foundations, Precast Concrete
of nonstructural fibers shall conform to ASTM C1116. Grout used for bedding precast foundations placed on concrete footings shall meet ASTM C1107 ...
R404.5 Foundations, Precast Concrete Foundation Walls
Precast concrete foundation walls shall be designed in accordance with accepted engineering practice. The design and manufacture of precast concrete ...
Residential Code 2018 of Kansas > 4 Foundations > R404 Foundation and Retaining Walls > R404.5 Precast Concrete Foundation Walls
Chapter 4 Foundations
User note:
About this chapter: Chapter 4 provides requirements for constructing footings and walls for foundations of wood, masonry, concrete ...
R405.1.1 Foundations, Precast Concrete Foundation
Precast concrete walls that retain earth and enclose habitable or useable space located below- grade that rest on crushed stone footings shall have ...
Residential Code 2018 of Kansas > 4 Foundations > R405 Foundation Drainage > R405.1 Concrete or Masonry Foundations > R405.1.1 Precast Concrete Foundation