In the context of commercial construction in Australia, a cap (capping) refers to a covering or a barrier installed to prevent or restrict the entry of unwanted elements, such as water, termites, or other pests, into a building or structure. Capping products are used to maintain roof sight lines while providing added protection 2.

Relevant Australian Standards and BCA Requirements

1. Australian Standards (AS):
   - AS 3700 - Masonry Structures: This standard provides guidelines for the design and construction of masonry structures, including the capping of masonry walls to prevent water ingress and deterioration.
   - AS 3600 - Concrete Structures: This standard covers the design and construction of concrete structures, including the requirements for capping beams and columns to protect against weathering and corrosion.
   - AS 1562 - Design and Installation of Sheet Roof and Wall Cladding: This standard includes provisions for the capping of sheet roofing and wall cladding to ensure weather-tightness and durability.

2. Building Code of Australia (BCA):
   - The BCA, which is part of the National Construction Code (NCC), sets out the minimum requirements for the design and construction of buildings in Australia. It includes provisions related to structural integrity, weatherproofing, and safety, which are relevant to capping in commercial construction.
   - Volume One of the NCC: This volume applies to Class 2 to 9 buildings (which include commercial buildings) and includes requirements for weatherproofing, structural stability, and fire resistance that may influence the design and implementation of capping.

Key Considerations for Capping in Commercial Construction

1. Weatherproofing: Capping must be designed to prevent water ingress, which can lead to structural damage and deterioration. This is particularly important for exposed elements such as parapets and wall tops.

2. Material Selection: The materials used for capping should be durable and compatible with the existing structure. Common materials include metal, concrete, and masonry.

3. Structural Integrity: Capping should contribute to the overall structural stability of the building. This may involve reinforcing the capped elements to withstand environmental loads such as wind and rain.

4. Aesthetic Considerations: In addition to functional requirements, capping can also serve an aesthetic purpose, providing a finished look to the building.

5. Safety: Capping should be designed and installed to ensure safety, particularly in preventing loose materials from becoming hazards.

Compliance and Best Practices

• Design and Documentation: Ensure that the design of capping elements is documented in accordance with the relevant Australian Standards and the BCA. This includes detailed drawings and specifications.
• Quality Control: Implement quality control measures during construction to ensure that capping is installed correctly and meets the required standards.
• Inspections: Conduct regular inspections during and after construction to verify compliance with design specifications and standards.