• Codes
  • Features

    Features Overview

    Go to features
    Reference

    Reference.

    A reliable and up-to-date source of codes.
    Research

    Research.

    Rapidly and efficiently calculate project parameters.
    Collaboration

    Collaboration.

    Get everyone on the same page and streamline code research.
    Workflows
    Architects
    Architects
    General Contractors
    General Contractors
    Building Official & Plans Examiners
    Building Official & Plans Examiners
    Inspectors
    Inspectors
    Owners
    Owners
    Subcontractors
    Subcontractors
    Code Consultants
    Code Consultants
  • Pricing
  • Login
  • Sign Up
Sign Up
Login
  • Code Library
  • Features
  • Pricing
  • About
  • Careers
  • Help
  • Contact
  • Terms
  • Privacy
Sign Up
Upgrade to Premium
Code calculators: Code Calculators automatically generates a detailed list of requirements.
REFERENCE
Amendment Styling
Industry-leading search
Code diagrams
RESEARCH
Code calculators
Filter by topic
Code compare
Code sheet exports
COLLABORATION
Team projects
Bookmarks
Comments
START 2 WEEK FREE TRIAL
Have an account? Sign in
// CODE SNIPPET

R404.2 Wood Foundation Walls

Residential Code 2018 of Kansas > 4 Foundations > R404 Foundation and Retaining Walls > R404.2 Wood Foundation Walls
JUMP TO FULL CODE CHAPTER
Wood foundation walls shall be constructed in accordance with the provisions of Sections R404.2.1 through R404.2.6 and with the details shown in Figures R403.1(2) and R403.1(3).

R404.2.1 Identification

Load-bearing lumber shall be identified by the grade mark of a lumber grading or inspection agency that has been approved by an accreditation body that complies with DOC PS 20. In lieu of a grade mark, a certificate of inspection issued by a lumber grading or inspection agency meeting the requirements of this section shall be accepted. Wood structural panels shall conform to DOC PS 1 or DOC PS 2 and shall be identified by a grade mark or certificate of inspection issued by an approved agency.

R404.2.2 Stud Size

The studs used in foundation walls shall be 2-inch by 6-inch (51 mm by 152 mm) members. Where spaced 16 inches (406 mm) on center, a wood species with an Fb value of not less than 1,250 pounds per square inch (8619 kPa) as listed in ANSI AWC NDS shall be used. Where spaced 12 inches (305 mm) on center, an Fb of not less than 875 psi (6033 kPa) shall be required.

R404.2.3 Height of Backfill

For wood foundations that are not designed and installed in accordance with AWC PWF, the height of backfill against a foundation wall shall not exceed 4 feet (1219 mm). Where the height of fill is more than 12 inches (305 mm) above the interior grade of a crawl space or floor of a basement, the thickness of the plywood sheathing shall meet the requirements of Table R404.2.3.
TABLE R404.2.3
PLYWOOD GRADE AND THICKNESS FOR WOOD FOUNDATION CONSTRUCTION (30 pcf equivalent-fluid weight soil pressure)
HEIGHT OF FILL
(inches)
STUD SPACING
(inches)
FACE GRAIN ACROSS STUDSFACE GRAIN PARALLEL TO STUDS
GradeaMinimum thickness
(inches)
Span ratingGradeaMinimum thickness
(inches)b, c
Span rating
2412B15/3232/16A15/3232/16
B15/32c32/16
16B15/3232/16A15/32c32/16
B19/32c (4, 5 ply)40/20
3612B15/3232/16A15/3232/16
B15/32c (4, 5 ply)32/16
B19/32 (4, 5 ply)40/20
16B15/32c32/16A19/3240/20
B23/3248/24
4812B15/3232/16A15/32c32/16
B19/32c (4, 5 ply)40/20
16B19/3240/20A19/32c40/20
A23/3248/24
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per cubic foot = 0.1572 kN/m3.
  1. 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. 1.1. Structural I C-D (Exposure 1).
      2. 1.2. C-D (Exposure 1).
    2. DOC PS 2 Plywood grades marked:
      1. 2.1. Structural I Sheathing (Exposure 1).
      2. 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:
      1. 3.1. Structural I A-C, Structural I B-C or Structural I C-C (Plugged) in accordance with DOC PS 1.
      2. 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. 3.3. Single Floor in accordance with DOC PS 1 or DOC PS 2.
  2. Minimum thickness 15/32 inch, except crawl space sheathing shall have not less than 3/8 inch for face grain across studs 16 inches on center and maximum 2-foot depth of unequal fill.
  3. 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.

R404.2.4 Backfilling

Wood foundation walls shall not be backfilled until the basement floor and first floor have been constructed or the walls have been braced. For crawl space construction, backfill or bracing shall be installed on the interior of the walls prior to placing backfill on the exterior.

R404.2.5 Drainage and Dampproofing

Wood foundation basements shall be drained and dampproofed in accordance with Sections R405 and R406, respectively.

R404.2.6 Fastening

Wood structural panel foundation wall sheathing shall be attached to framing in accordance with Table R602.3(1) and Section R402.1.1.

Related Code Sections


R404.2 Foundations, Wood Foundation Walls
Wood foundation walls shall be constructed in accordance with the provisions of Sections R404.2.1 through R404.2.6 and with the details shown ...
Residential Code 2018 of Kansas > 4 Foundations > R404 Foundation and Retaining Walls > R404.2 Wood Foundation Walls
R404.2.6 Foundations, Fastening
Wood structural panel foundation wall sheathing shall be attached to framing in accordance with Table R602.3(1) and Section R402.1.1 ...
Residential Code 2018 of Kansas > 4 Foundations > R404 Foundation and Retaining Walls > R404.2 Wood Foundation Walls > R404.2.6 Fastening
2304.12.1.2 Wood, Wood Supported by Exterior Foundation Walls
Wood framing members, including wood sheathing, that are in contact with exterior foundation walls and are less than 8 inches (203 mm) from exposed ...
Building Code 2018 of Kansas > 23 Wood > 2304 General Construction Requirements > 2304.12 Protection Against Decay and Termites > 2304.12.1 Locations Requiring Waterborne Preservatives or Naturally Durable Wood > 2304.12.1.2 Wood Supported by Exterior Foundation Walls
R610.5.2 Wall Construction, Bottom (Sole) Plate Connection
on continuous foundations, the wall wood sill plate shall be anchored to the foundation in accordance with Figure R610.5.2 and Section R403.1 ...
Residential Code 2018 of Kansas > 6 Wall Construction > R610 Structural Insulated Panel Wall Construction > R610.5 Wall Construction > R610.5.2 Bottom (Sole) Plate Connection
Help Contact Us Privacy Terms
Shared projects
Shared projects
Projects provide a dedicated space to collaborate on code research.
Code sheet exports
Code sheet exports
Generate a code sheet that integrates with your drawing set.
Code Calculators
Code Calculators
Code calculators automatically generate a detailed list of requirements.
Code diagrams
Code diagrams
Unpack the code through illustrations and descriptions.
Search
Search
Don't miss relevant code. Quickly locate sections across your jurisdiction.
Code Compare
Code Compare
Highlight differences between any two building codes.
UpCodes Premium
Leverage the most sophisticated code compliance platform.
VISIT PRICING
UpCodes Premium
Leverage the full code compliance platform.
START 2 WEEK FREE TRIAL PRICING