A kneecap is a specialized piece of metal flashing used in standing seam or corrugated metal roofing. When a continuous roof panel is bent to transition from a steep slope to a lower slope, the raised ribs must be cut and folded. The kneecap is installed over this cut joint to seal it against water intrusion and provide a finished appearance.
Heard on the job
Make sure you seal the kneecap with butyl tape before riveting it over the transition rib.
Also heard as
- rib cover
- transition cap