803.13.4 Materials.
BC § 803.13.4
An interior wall or ceiling finish material that is not more than 1/4 inch (6.4 mm) thick shall be applied directly onto the wall, ceiling or building element without the use of furring strips and shall not be suspended away from the building element to which that finish material is applied. Exceptions: 1. Noncombustible interior finish materials.
2.Materials that meet the requirements of Class A materials in accordance with Section 803.1.1 or 803.1.2 where the qualifying tests were made with the material furred out from the noncombustible backing.
3.Materials that meet the requirements of Class A materials in accordance with Section 803.1.1 or 803.1.2 where the qualifying tests were made with the material suspended away from the noncombustible backing shall be permitted to be used suspended away from the building element.
