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Thin metal plate Cramping Methods

Standing Seam

This is the most commonly used connection method for roofing and exterior walls. There are lines of even intervals, creating superb visual qualifies. And, due to the extrusion of the finishing material, this method provides a superb level of water-proofing performance. Depending on the finishing method, this method is divided into the double standing seam method and the angle standing seam method.

Batten Seam, Roll Cap

In this method, a square pipe material is fixed on the base material with a slope. Then, folded panels are inserted between the square materials. Then, the rising part of the panel is covered by a cap. This joining method is widely used when the line is important and visual effects are desired. Compared to the standing seam method, the lines are more vivid, and the visual effect is better with this method.

Step Lock Seam

The sides of the roof are formed in a cascade form from the eaves to the ridge. This method is suitable for roofs of milder slopes. The entire line of the roof is horizontal, providing a stabilized visual effect and facilitating drainage.

Cross Seam, Flat Lock Seam

In this method, the panels are processed in small sizes and the slopes between the panels are clamped. This method is suitable for free-form curvatures, and, according to the intent of the designer, various forms can be realized. While it is relatively easy to install the materials in this method, it is recommended to be used on roofs and exterior walls of 30% or higher inclines for the sake of waterproofing.


In this open-joint method, the seam is hidden inside. This method is suitable when a flat and straight surface is required. The sheets of 0.7mm ~ 1.0mm in thickness can be adjusted in width by approx. 300mm. The bottom side is equipped with plywood and waterproof paper in order to prevent infiltration of the rain water. And, depending on the situation it is possible to use this method on top of zinc-coated pipe directly.                        

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