Z--Parapet Guard Railing Replacement

DOI intends to have OSHA compliant guardrails installed at the following locations within the Stuart Lee Udall Department of the Interior Building located at 1849C Street, NW, Washington, DC 20240 as follows: 1. Parapet wall section between wings 2 and 3 east. 2. Parapet wall section between wings 2 and 3 west. 3. Parapet wall section between wings 3 and 4 east. 4. Parapet wall section between wings 3 and 4 west. 5. Parapet wall section between wings 4 and 5 east. 6. Parapet wall section between wings 4 and 5 west. 7. Parapet wall section between wings 5 and 6 east. 8. Parapet wall section between wings 5 and 6 west. This area is located on the exterior of the building and currently has wooden railings. The wooden railings are to be replaced with guardrails that are OSHA compliant, historically compliant and is within all required building codes. Guardrail systems: Guardrail systems and their use shall comply with the following provisions: - Top edge height of top rails, or equivalent guardrail system members, shall be 42 inches (1.1m) plus or minus 3 inches (8 cm) above the walking working level. When conditions warrant, the height of the top edge may exceed the 45-inch height, provided the guardrail system meets all other criteria of this paragraph. Midrails, screens, mesh, intermediate vertical members, or equivalent intermediate structural members shall be installed between the top edge of the guardrail system and the walking/working surface when there is no wall or parapet wall at least 21 inches (53cm) high. - Midrails, when used, shall be installed at a height midway between the top edge of the guardrail system and the walking/working level. - Screens and mesh, when used, shall extend from the top rail to the walking/working level and along the entire opening between top rail supports. - Intermediate members (such as balusters), when used between posts, shall be not more than 19 inches (48 cm) apart. - Other structural members (such as additional midrails and architectural panels) shall be installed such that there are no opening in the guardrail system that are more than 19 inches (.5m) wide. - Guardrail systems shall be capable of withstanding, without failure, a force of at least 200 pounds (890 N) applied within 2 inches (5.1 cm) of the top edge, in any outward or 5 downward direction, at any point along the top edge, in any outward or downward direction, at any point along the top edge. - When the 200 pound (890 N) test load specified in paragraph (b)(3) of this section is applied in a downward direction, the top edge of the guardrail shall not deflect to a height less than 39 inches (1.0 m) above the walking/working level. Guardrail system components selected and constructed in accordance with the appendix B to subpart M of this part will be deemed to meet this requirement. - Midrails, screens, mesh, intermediate vertical members, solid panels and equivalent structural members shall be capable of withstanding, without failure, a force of at least 150 pounds (666 N) applies in any downward or outward direction at any point along the maidrail or other member. - Guardrail systems shall be surfaced as to prevent injury to employee from punctures or lacerations, and to prevent snagging of clothing. - The ends of all top rails and midrails shall not overhang the terminal posts, except where such overhang does not constitute a projection hazard. - Steel banding and plastic banding shall not be used as top rails or midrails. - Top rails and midrails shall be at least one-quarter inch (0.6 cm) nominal diameter or thickness to prevent cuts and lacerations. If wire rope is used for top rails, it shall be flagged at not more than 6-foot (1.8m) intervals with high visibility material. - When guardrail systems are used at joisting areas, a chain, gate or removable guardrail section shall be placed across the access opening between guardrail sections when hoisting operations are not taking place. - Guardrails systems used on ramps and runways shall be erected along each unprotected side or edge. - Manilla, plastic or synthetic rope being used for top rails or midrails shall be inspected as requisitely as necessary to ensure that it continues to meet the strength requirements of this section.

Division 05 -

Metals, Metal Railings.