Is Your Roof Leak Actually a Box Gutter Problem?

Many commercial landlords and managing agents in Cape Town face the same frustrating pattern: water appears inside the building every time it rains, a contractor repairs the "roof leak", and a few months later the stain returns. When a leak survives repeated roof repairs, the problem is often not the roof sheeting at all - it is the box gutter.

A box gutter is a drainage channel built into the roofline itself, rather than hanging from the edge of the roof. Because it sits above the building's interior, any failure in the gutter sends water straight into ceilings, walls and occupied areas below.

• They are hidden inside the roofline, so deterioration is not visible from the ground.
• Water can travel along the structure before appearing inside, so the stain is often far from the actual failure point.
• General roof repairs focus on sheeting and flashing, not on the gutter channel running through the middle of the roof.
• Previous patch repairs can mask the symptoms temporarily, creating the impression the problem was solved.

• The same leak returns after every heavy rain, despite previous repairs.
• Staining or dripping appears along the line where two roof sections meet, or along internal walls below the roof valley.
• You can see rust, bubbling paint or corrosion on the gutter channel itself.
• The building has an older asbestos or fibre-cement roof with a built-in gutter, where conventional gutter replacement can become more complex.
• Tenants report water ingress in the same spots every winter.

Before paying for another general roof repair, have the box gutter inspected directly. A proper inspection examines the gutter runs, outlets, failure points and access conditions - and tells you definitively where the water is getting in.

RubberGutter System™ by LabWorks offers a Free Roof Check for commercial and industrial properties in Cape Town and surrounding areas. Request your inspection here.