3.1 – Roof cladding systems – 3. Transversal joints in the standing seam cladding 184 3.1. 3. TRANSVERSAL JOINTS IN THE STANDING SEAM CLADDING In a standing seam cladding system, the sheets are anchored with fixed and sliding clips. Using high-sliding clips pitches can be clad with a single sheet up to a length of 17 m. If the pitch length is greater than 17 m, it is necessary to use aligned transversal joints that allow the sheets to expand and slide. The transversal joints must be aligned with each other because, through friction, the double standing seam longitudinal joint does not permit differential thermal expansion between the sheets. The clips must never be positioned at the transversal joints and at the overlap between the two sheets. Example of laying with double standing seam longitudinal joint STAGGERED JOINTS 300 mm Pitch length ≤ 17 m for double standing seam longitudinal joints that do not allow movement of the transversal joint. Pitch length > 17 m for angular standing seam longitudinal joints. To avoid the formation of thickenings of the material, we recommend staggering the transversal joints by at least 300 mm. ALIGNED JOINTS Aligned joints allow compensation of longitudinal expansion for both the double and angular standing seam. STAGGERED JOINTS Double standing seam or angular standing seam longitudinal joint Transversal joint with hooking strip or simple welt A A A B B B A B EXCERPT
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