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Excerpts from 2000 INTERNATIONAL BUILDING CODE®

Note: This excerpt is only a portion of a larger, Referenced Standards document and out of context may not include all information needed for use. Also, it may not reflect the most current building code requirements. The Referenced Standard, in its entirety, may be available for purchase from the International Code Council at http://shop.iccsafe.org.

1003.2.12.2 Opening limitations.

Open guards shall have balusters or ornamental patterns such that a 4-inch-diameter (102 mm) sphere cannot pass through any opening up to a height of 34 inches (864 mm). From a height of 34 inches (864 mm) to 42 inches (1067 mm) above the adjacent walking surfaces, a sphere 8 inches (203 mm) in diameter shall not pass.

Exceptions:

  1. The triangular openings formed by the riser, tread and bottom rail at the open side of a stair- way shall be of a maximum size such that a sphere of 6 inches (152 mm) in diameter cannot pass through the opening.

  2. At elevated walking surfaces for access to and use of electrical, mechanical, or plumbing systems or equipment, guards shall have balusters or be of solid materials such that a sphere with a diameter of 21 inches (533 mm) cannot pass through any opening.

  3. In occupancies in Group I-3, F, H or S, balusters, horizontal intermediate rails or other construction shall not permit a sphere with a diameter of 21 inches (533 mm) to pass through any opening

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