Page 136 - 2018_IRC

FOUNDATIONS

R403.4.1 Crushed stone footings. Clean crushed stone 2. Walls supporting more than 48 inches (1219 mm) of
shall be free from organic, clayey or silty soils. Crushed unbalanced backfill that do not have permanent lat-
stone shall be angular in nature and meet ASTM C33, with eral support at the top or bottom.
1
the maximum size stone not to exceed / inch (12.7 mm) R404.1.2 Design of masonry foundation walls. Masonry
2
1
and the minimum stone size not to be smaller than / inch foundation walls shall be designed and constructed in
16
(1.6 mm). Crushed stone footings for precast foundations accordance with the provisions of this section or in accor-
shall be installed in accordance with Figure R403.4(1) and dance with the provisions of TMS 402. Where TMS 402
Table R403.4. Crushed stone footings shall be consolidated or the provisions of this section are used to design
using a vibratory plate in not greater than 8-inch (203 mm) masonry foundation walls, project drawings, typical
lifts. Crushed stone footings shall be limited to Seismic details and specifications are not required to bear the seal
Design Categories A, B and C. of the architect or engineer responsible for design, unless
R403.4.2 Concrete footings. Concrete footings shall be otherwise required by the state law of the jurisdiction hav-
installed in accordance with Section R403.1 and Figure ing authority.
R403.4(2). R404.1.2.1 Masonry foundation walls. Concrete
masonry and clay masonry foundation walls shall be
constructed as set forth in Table R404.1.1(1),
SECTION R404 R404.1.1(2), R404.1.1(3) or R404.1.1(4) and shall
FOUNDATION AND RETAINING WALLS comply with applicable provisions of Section R606. In
R404.1 Concrete and masonry foundation walls. Concrete buildings assigned to Seismic Design Categories D , D
0
foundation walls shall be selected and constructed in accor- and D , concrete masonry and clay masonry foundation 1
2
dance with the provisions of Section R404.1.3. Masonry walls shall also comply with Section R404.1.4.1. Rub-
foundation walls shall be selected and constructed in accor- ble stone masonry foundation walls shall be con-
dance with the provisions of Section R404.1.2. structed in accordance with Sections R404.1.8 and
R404.1.1 Design required. Concrete or masonry founda- R606.4.2. Rubble stone masonry walls shall not be
tion walls shall be designed in accordance with accepted used in Seismic Design Categories D , D and D .
2
1
0
engineering practice where either of the following condi- R404.1.3 Concrete foundation walls. Concrete founda-
tions exists: tion walls that support light-frame walls shall be designed
1. Walls are subject to hydrostatic pressure from and constructed in accordance with the provisions of this
ground water. section, ACI 318, ACI 332 or PCA 100. Concrete founda-
tion walls that support above-grade concrete walls that are

PRECAST
CONCRETE
WALL PRECAST
CONCRETE
WALL

INTERIOR
INTERIOR

CRUSHED STONE
FOOTING
P P

D T
NS GROUT

W W
FIGURE R403.4(1) FIGURE R403.4(2)
BASEMENT OR CRAWL SPACE WITH PRECAST BASEMENT OR CRAWL SPACE WITH PRECAST
FOUNDATION WALL BEARING ON CRUSHED STONE FOUNDATION WALL ON SPREAD FOOTING

2018 INTERNATIONAL RESIDENTIAL CODE ® 111
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