IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD TABLE R403.1, MINIMUM WIDTH OF CONCRETE, PRECAST, OR MASONRY FOOTINGS
Boise City Code § 9-1B-49
in effect9-1B-49: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, ADD TABLE R403.1, MINIMUM WIDTH OF CONCRETE, PRECAST, OR MASONRY FOOTINGS:
Add Table R403.1, Minimum Width Of Concrete, Precast, Or Masonry Footings as follows:
TABLE R403.1
MINIMUM WIDTH OF CONCRETE, PRECAST, OR MASONRY FOOTINGS (inches)a
| LOAD-BEARING VALUE OF SOIL (psf)
1,500 | 2,000 | 3,000 | 4,000
| LOAD-BEARING VALUE OF SOIL (psf)
1,500 | 2,000 | 3,000 | 4,000
Conventional light-frame construction
1-Story | 12 | 12 | 12 | 12
2-Story | 15 | 12 | 12 | 12
3-Story | 23 | 17 | 12 | 12
4-inch brick veneer over light-frame or 8-inch hollow concrete masonry
1-Story | 12 | 12 | 12 | 12
2-Story | 21 | 16 | 12 | 12
3-Story | 32 | 24 | 16 | 12
8-inch solid or fully grouted masonry
1-Story | 16 | 12 | 12 | 12
2-Story | 29 | 21 | 14 | 12
3-Story | 42 | 32 | 21 | 16
For SI: 1 inch = 25.4mm, 1 pound per square foot = 0.0479 kPa.
a. Where minimum footing width is twelve (12) inches, use of a single wythe of solid or fully grouted twelve (12) inch nominal concrete masonry units is permitted.
(Ord. 40-20, 12-1-2020, eff. 1-1-2021)
Source: Boise City, Idaho, City Code and City Charter (American Legal Publishing, codelibrary.amlegal.com)URL: https://codelibrary.amlegal.com/codes/boise_id/latest/boise/0-0-0-37459Fetched: 11/1/2026