// CODE SNIPPET
Section R506 Concrete Floors (On Ground)
JUMP TO FULL CODE CHAPTER
Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of this section or ACI 332. Floors shall be a minimum 31/2 inches (89 mm) thick (for expansive soils, see Section R403.1.8). The specified compressive strength of concrete shall be as set forth in Section R402.2.
The area within the foundation walls shall have all vegetation, top soil and foreign material removed.
Fill material shall be free of vegetation and foreign material. The fill shall be compacted to ensure uniform support of the slab, and except where approved, the fill depths shall not exceed 24 inches (610 mm) for clean sand or gravel and 8 inches (203 mm) for earth.
A 4-inch-thick (102 mm) base course consisting of clean graded sand, gravel, crushed stone, crushed concrete or crushed blast-furnace slag passing a 2-inch (51 mm) sieve shall be placed on the prepared subgrade where the slab is below grade.
A 6-mil (0.006 inch; 152 µm) polyethylene or approved vapor retarder with joints lapped not less than 6 inches (152 mm) shall be placed between the concrete floor slab and the base course or the prepared subgrade where a base course does not exist.
Exception: The vapor retarder is not required for the following:
- Garages, utility buildings and other unheated accessory structures.
- For unheated storage rooms having an area of less than 70 square feet (6.5 m2) and carports.
- Driveways, walks, patios and other flatwork not likely to be enclosed and heated at a later date.
- Where approved by the building official, based on local site conditions.
Related Code Sections
Section R506 Floors, Concrete Floors (On Ground)
Concrete slab-on-ground floors shall be designed and constructed in accordance with the provisions of this section or ACI 332. Floors shall ...
R506.2.4 Floors, Reinforcement Support
Where provided in slabs-on-ground, reinforcement shall be supported to remain in place from the center to upper one-third of the slab ...
Residential Code 2018 of Kansas > 5 Floors > R506 Concrete Floors (On Ground) > R506.2 Site Preparation > R506.2.4 Reinforcement Support
2512.1.1 Gypsum Board, Gypsum Panel Products and Plaster, On-Grade Floor Slab
On wood frame or steel stud construction with an on-grade concrete floor slab system, exterior plaster shall be applied in such a manner as to cover ...
Building Code 2018 of Kansas > 25 Gypsum Board, Gypsum Panel Products and Plaster > 2512 Exterior Plaster > 2512.1 General > 2512.1.1 On-Grade Floor Slab
(C) Wiring and Protection, On Live-Front Switchboards
or other suitable floor insulation shall be provided for the operator where the voltage to ground exceeds 150 ...
National Electrical Code 2017 of Kansas > 2 Wiring and Protection > 250 Grounding and Bonding > 250.174 Cases of Instruments, Meters, and Relays Operating at 1000 Volts or Less > (C) On Live-Front Switchboards
13.2.4 Foundations, Slabs-On-Ground
Slabs-on-ground that transmit vertical loads or lateral forces from other parts of the structure to the ground shall be designed and detailed ...
Building Code Requirements for Structural Concrete of Kansas > 13 Foundations > 13.2 General > 13.2.4 Slabs-On-Ground