Guide to Forming an Upstand for a Korniche Roof Lantern

Guide to Forming an Upstand for a Korniche Roof Lantern

Installing a Korniche roof lantern involves creating a solid and precise upstand to support the structure. The upstand is crucial for ensuring the stability, weatherproofing, and thermal efficiency of the roof lantern. Follow these steps to form an upstand for a Korniche roof lantern:

Materials Needed:

• Treated timber
• Screws/
• Insulation material
• Exterior-grade plywood or OSB (Dependent of Roof Finish)
• Level
• Tape measure
• Saw
• Drill
• Roofing sealant

Step-by-Step Instructions:

1. Planning and Measurement

• Determine the Lantern Size: Start by determining the dimensions of your Korniche roof lantern.
• Consider Overhang: Korniche roof lanterns are designed to have a 6mm overhang. Therefore, the upstand needs to be 12mm smaller in both length and width than the intended roof lantern size. For example, if your roof lantern is 1000mm x 1500mm, your upstand should be 988mm x 1488mm.
  • Option to Size Lantern to Upstand: Alternatively, you can measure and construct your upstand first and then order the roof lantern to match this size, ensuring the correct overhang.
• Roofing Type Considerations: There are various roofing types to consider, and this will need to be accommodated in the roof upstand size and dimensions. Ensure the waterproofing finish runs up the upstand and over the top to achieve the most effective waterproofing detail.
• Upstand Height: The height of the upstand should be a minimum of 150mm above the finished roof level to comply with building regulations and to ensure proper water runoff.

2. Construct the Upstand Frame

• Cut Timber: Cut treated timber to form the upstand frame, generally using 400mm centers for the upstand ladder. This should include:
  • Sole Timber: To fix to the roof joists.
  • Head Timber: To support the roof lantern and provide a stable base.
  Ensure the upstand is 12mm smaller in both length and width than the roof lantern dimensions to accommodate the 6mm overhang.
• Build the Frame: Assemble the frame on the roof, using screws or nails to join the corners securely. Double-check that all corners are square by measuring the diagonals and ensuring they are equal.
• Fix to Roof Structure: Secure the upstand frame to the roof structure, ensuring it is level and properly aligned with the roof lantern opening.

3. Insulate the Upstand

• Cut Insulation: Cut insulation material to fit snugly within the upstand frame.
• Install Insulation: Place the insulation between the timber frame members. This will help improve the thermal efficiency of the roof lantern installation.

4. Final Preparations

• Check Level and Square: Double-check that the top of the upstand is level and that the frame is square. Adjust if necessary to ensure a perfect fit for the roof lantern.

5. Install the Roof Lantern

• Place the Roof Lantern: Carefully lift the Korniche roof lantern onto the upstand, ensuring it sits evenly and securely on the frame.
• Secure the Lantern: Follow the manufacturer's instructions to secure the roof lantern to the upstand. This typically involves fixing brackets or plates.

6. Finishing Touches

• Seal Around the Base: Apply a bead of good quality sealant around the base of the roof lantern where it meets the upstand to ensure a watertight seal.

Tips:

• Accuracy: Ensure all measurements are precise to avoid gaps or misalignment.
• Quality Materials: Use high-quality, treated timber and exterior-grade materials to ensure longevity.
• Weather Conditions: Avoid installing during adverse weather conditions to prevent moisture issues.

By following these steps and considering the necessary overhang and roofing type, you can form a robust and weatherproof upstand for your Korniche roof lantern, ensuring it is both functional and aesthetically pleasing.