I wasn't able to find specific documentation on guardrail requirements and regulations in New Brunswick, Canada, but here is some general safety guidance based on industry standards and best practices. Guardrails are generally required on open-sided floors, platforms, runways, and walkways that are a certain height above the ground or another level. The specific height requirement can vary, but it's often around 1.2 meters (4 feet). Guardrails typically consist of a top rail, an intermediate rail, and posts. A toeboard may also be required to prevent tools and materials from falling off the edge. The top rail should be smooth and strong enough to withstand a specified load. The intermediate rail should be placed midway between the top rail and the walking surface. The posts should be spaced appropriately to provide adequate support for the guardrail system. When selecting materials for guardrails, consider factors such as strength, durability, and resistance to environmental conditions. Wood, steel, and aluminum are common choices. Ensure that the materials are free from defects and are suitable for the intended use. Guardrails should be inspected regularly to identify any damage or deterioration. Damaged or weakened guardrails should be repaired or replaced promptly. Workers should be trained on the proper use and maintenance of guardrails, as well as the importance of fall protection measures.