Page 155 - 2018_IRC

FOUNDATIONS

TABLE R404.2.3
PLYWOOD GRADE AND THICKNESS FOR WOOD FOUNDATION CONSTRUCTION (30 pcf equivalent-fluid weight soil pressure)
FACE GRAIN ACROSS STUDS FACE GRAIN PARALLEL TO STUDS
HEIGHT OF FILL STUD SPACING
(inches) (inches) Grade a Minimum thickness Span rating Grade a Minimum thickness Span rating
(inches) (inches) b, c
A 15 / 32/16
12 B 15 / 32 32/16 15 32 c
24 B 15 / / 32 c 32/16
32/16
A
16 B 15 / 32/16 32
32 19 c
B / 32 (4, 5 ply) 40/20
A 15 / 32/16
32
12 B 15 / 32 32/16 B 15 / 32 c (4, 5 ply) 32/16
36 B 19 / (4, 5 ply) 40/20
32
A 19 / 40/20
16 B 15 / c 32/16 32
32
B 23 / 32 48/24
A 15 / c 32/16
12 B 15 / 32 32/16 19 c 32
32
48 B / (4, 5 ply) 40/20
40/20
c
A
19
/
16 B 19 / 40/20 32
32 23
A / 32 48/24
3
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per cubic foot = 0.1572 kN/m .
a. Plywood shall be of the following minimum grades in accordance with DOC PS 1 or DOC PS 2:
1. DOC PS 1 Plywood grades marked:
1.1. Structural I C-D (Exposure 1).
1.2. C-D (Exposure 1).
2. DOC PS 2 Plywood grades marked:
2.1. Structural I Sheathing (Exposure 1).
2.2. Sheathing (Exposure 1).
3. Where a major portion of the wall is exposed above ground and a better appearance is desired, the following plywood grades marked exterior are suitable:
3.1. Structural I A-C, Structural I B-C or Structural I C-C (Plugged) in accordance with DOC PS 1.
3.2. A-C Group 1, B-C Group 1, C-C (Plugged) Group 1 or MDO Group 1 in accordance with DOC PS 1.
3.3. Single Floor in accordance with DOC PS 1 or DOC PS 2.
3
15
b. Minimum thickness / inch, except crawl space sheathing shall have not less than / inch for face grain across studs 16 inches on center and maximum 2-foot
32
8
depth of unequal fill.
c. For this fill height, thickness and grade combination, panels that are continuous over less than three spans (across less than three stud spacings) require
blocking 16 inches above the bottom plate. Offset adjacent blocks and fasten through studs with two 16d corrosion-resistant nails at each end.
R404.5 Precast concrete foundation walls. 5. Maximum allowable total uniform load.
R404.5.1 Design. Precast concrete foundation walls shall 6. Seismic design category.
be designed in accordance with accepted engineering prac- 7. Basic wind speed.
tice. The design and manufacture of precast concrete foun-
dation wall panels shall comply with the materials R404.5.3 Identification. Precast concrete foundation wall
requirements of Section R402.3 or ACI 318. The panel panels shall be identified by a certificate of inspection
design drawings shall be prepared by a registered design label issued by an approved third-party inspection agency.
professional where required by the statutes of the jurisdic-
tion in which the project is to be constructed in accordance
SECTION R405
with Section R106.1. FOUNDATION DRAINAGE
R404.5.2 Precast concrete foundation design drawings.
Precast concrete foundation wall design drawings shall be R405.1 Concrete or masonry foundations. Drains shall be
submitted to the building official and approved prior to provided around concrete or masonry foundations that retain
installation. Drawings shall include, at a minimum, the earth and enclose habitable or usable spaces located below
following information: grade. Drainage tiles, gravel or crushed stone drains, perfo-
rated pipe or other approved systems or materials shall be
1. Design loading as applicable. installed at or below the top of the footing or below the bottom
2. Footing design and material. of the slab and shall discharge by gravity or mechanical means
into an approved drainage system. Gravel or crushed stone
3. Concentrated loads and their points of application.
drains shall extend not less than 1 foot (305 mm) beyond the
4. Soil bearing capacity. outside edge of the footing and 6 inches (152 mm) above the

130 2018 INTERNATIONAL RESIDENTIAL CODE ®
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.