Cast angle gutter corner. Why do they leak?

Cast angle gutter corners can sometimes leak due to various reasons, including:

1. Lack of maintenance: If the cast angle gutter corner is not properly maintained, debris or dirt can accumulate and cause blockages, leading to water overflowing and leaking at the corner joints.
2. Silicone breaking down due to age and wear and tear: Over time, the silicone sealant used to seal the joints of the cast angle gutter corner can deteriorate and break down, causing gaps where water can seep through.
3. Leaking cast angle gutter corners can allow rainwater to damage the existing timber fascia: When a cast angle gutter corner leaks, water can run down the exterior of the building and come into contact with the timber fascia. This can cause the timber to rot, warp, or deteriorate over time, leading to potential structural damage.

To prevent leaks in cast angle gutter corners, regular maintenance is essential. This includes cleaning out debris, inspecting the silicone seals for any signs of wear or damage, and promptly addressing any leaks or issues that arise. Proper installation and sealing of the gutter corners are also important to ensure they are watertight and protect the timber fascia from water damage.