Chapter 4: Foundations Code Section Section Title Change MINIMUM WIDTH OF TABLE R403.1 MINIMUM WIDTH OF CONCRETE OR MASONRY TABLE R403 CONCRETE OR FOOTINGS MASONRY FOOTINGS (inches)a For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. Where minimum footing width is 12 inches, use a single with of solid or fully grouted 12-inch nominal concrete masonry units is permitted. A minimum footing width of is acceptable for 12” monolithic slab foundations. R403.1.4 Minimum depth Has been revised to read that footing bottom shall extend not less than 12 inches below finished grade (in addition to being below frost line depth). R408.1.1 Foundation Vent Sizing Change re-establishes a provision found in the 2003 NCRC for reducing the require net area of ventilation openings to 1/1500 of the underfloor area where the ground is covered with a vapor retarder. Section has be revised to begin with required “When R408.2 Ground vapor retarder by Section Eliminates conflict in language R408.1.1”. in Section R408.1.1 and R408.2.
Chapter 4: Foundations Code Section Section Title Change TABLE R403 MINIMUM WIDTH OF CONCRETE OR MASONRY FOOTINGS TABLE R403.1 MINIMUM WIDTH OF CONCRETE OR MASONRY FOOTINGS (inches)a For SI: 1 inch = 25.4 mm, 1 pound per square foot = 0.0479 kPa. Where minimum footing width is 12 inches, use a single with of solid or fully grouted 12-inch nominal concrete masonry units is permitted. A minimum footing width of 12” is acceptable for monolithic slab foundations. R403.1.4 Minimum depth Has been revised to read that footing bottom shall extend not less than 12 inches below finished grade (in addition to being below frost line depth). R408.1.1 Foundation Vent Sizing Change re-establishes a provision found in the 2003 NCRC for reducing the require net area of ventilation openings to 1/1500 of the underfloor area where the ground is covered with a vapor retarder. R408.2 Ground vapor retarder Section has be revised to begin with “When required by Section R408.1.1”. Eliminates conflict in language in Section R408.1.1 and R408.2.
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