Section R404.1.3.2.3, Foundation Walls For Conventional Light Frame Wood Construction, of the IRC, are hereby established by adding the following sections and table:
Section R404.1.3.2.3 Foundation Walls For Conventional Light Frame Wood Construction As an alternate to the requirements of this code the following Table 'Foundation Walls for Conventional Light Frame Construction' may be used:
Table - ‘Foundation Walls for Conventional Light Frame Construction’
Height of Foundation Wall (Net measured from top of basement slab to top of foundation wall)* | Thickness of Foundation Walls | Reinforcement type and placement within Foundation Wall** | Reinforcement type and placement within Foundation Wall** (maximum 12’ span between corners and supporting cross walls) | Type of Mortar | ||
Unit | ||||||
Gross | Net | Concrete | Masonry | Concrete | Masonry | Masonry |
8 | 7’ 8” | 7 ½” | 8” | ½” horizontal bars, placement in the middle, and near the top & bottom – ½” bars @ 6’ max. vertically | 0.075 square inch bar 8’ o.c. vertically in fully grouted cells. If block is 12” nominal thickness, may be unreinforced. | Type M or S. Grout & Mortar shall meet provisions of Chapter 21 IBC |
9 | 8’ 8” | 8” | See Chapter 18 IBC | ½” bars 2’ o.c. horizontally & 20” vertically o.c. (5/8” bars 2’ o.c. horizontally & 30” vertically o.c.) | See Chapter 18 IBC | Same as above |
10 | 9’ 8” | 8” | See Chapter 18 IBC
|
See Chapter 18 IBC | Same as above | |
*Concrete floor slab to be nominal 4”. If such floor slab is not provided prior to backfill, provide 1) 36” vertical #4 rebar embedded in the footing @ maximum 7’ O.C. spacing -and/or- 2) full depth nominal 2”depth x 4”width keyway in footing | ||||||
** All reinforcement bars shall meet ASTM A6184 grade 40 minimum and be deformed. Placement of bars shall be in center of wall and meet the provisions of this Code. | ||||||
NOTE: Cast in place concrete shall have a compressive strength of 3,000 lbs @ 28 days. Footings shall contain continuous reinforcement of 2 - ½" diameter rebar throughout. Placement of reinforcement and concrete shall meet the requirements of this Code. | ||||||
NOTE: Material used for backfilling shall be carefully placed granular soil of average or high permeability and shall be drained with an approved drainage system as prescribed in Section R405.1 of this Code. Where soils containing a high percentage of clay, fine silt or similar materials of low permeability or expansive soils are encountered or where backfill materials are not drained or an unusually high surcharge is to be placed adjacent to the wall, a specially designed wall shall be required | ||||||
Note: Foundation plate or sill anchorage shall be installed in accordance with this code as applicable. | ||||||