Minimising Oil Canning

Good design and installation can minimise oil canning.

Materials:

• Use thicker material.
• Use low gloss paints or embossed surfaces.
• Use natural weathering materials that dull over time.

Flashings:

• Limit flashing width to 300 mm.
• Limit the joined length of fixed flashings to 12 m.
• Attach wide flashings with brackets that allow independent thermal expansion.
• Manufacture a stiffening swage into flashings that have a face width greater than 200 mm.
• Do not fix flashings to timber with a moisture content greater than 18%.

Cladding:

• Limit cladding length.
• Ensure the purlin alignment avoids convex curving.
• Inspect for flatness before installation.
• Avoid thin materials.