Metal roofs are constructed of interlocking panels that run vertically from the ridge of the roof to the eaves. Each panel is joined to the next by a raised seam known as a standing seam, which gives visual interest to the roof and directs water away from it.
A standing seam is formed when two separate roof panels of sheet metal are joined together, by folding over the standing long edges, one on each sheet, and squeezing them together with a pair of seaming pliers. A whole roof can be covered in this way.
Metal roof panels are pre-fabricated and each panel has a female edge and a male edge, on the two longest sides of the panel.
The female edge is designed to fit over the male edge of a corresponding panel.
The female edge of one roof panel is designed to slide easily over the male edge of another panel, and then these edges are sealed using seaming pliers.
The edges of two pieces of sheet metal are joined together by sealing the standing seams with seaming pliers.
How to seal a standing seam
Step 1 – Hold seaming pliers
Seaming pliers are held in both hands and the jaws grasp the standing seam on a roof panel.
Step 2 – Seal the seam
Seaming pliers are moved up and down the seam whilst the user closes the handles together to apply the pressure needed to seal the seam.
Step 3 – Finish sealing the seam
Once the seam is sealed, it is watertight and rainwater is prevented from finding its way into the roof.