A traditional metal roofing and cladding seam where the edge of one panel is folded back on itself and the adjacent panel is folded under, allowing them to hook together. The joint is then hammered flat and often soldered to create a watertight seal on low-slope roofs or decorative wall panels.
Heard on the job
The architect wants a copper flat lock roof on the bay window to keep a low profile.
Also heard as
- flat seam
Related terms
Standing seam
A metal roofing system where continuous panels are joined by raised interlocking seams.
Double lock standing seam
A metal roofing joint where adjacent panel edges are folded over twice to create a watertight seal.
Seam
The line or joint where two pieces of building material meet and are fastened together.