Trayl lengths up to 3 meters can be installed with fixing clips only. Panel lengths of up to 12 metres are possible when using PREFA stainless steel preformed sliding clips in accordance with PREFA installation guidelines. In addition to the PREFA stainless steel fixed clips for panel lengths between 12m and 15m, PREFA stainless steel long sliding clips must be installed (do not combine them with PREFA stainless steel preformed sliding clips).
The length of the fixed clip area should be 3 metres. Positioning of the fixed clips area must always be selected in relation to the existing roof pitch - see figure below and associated table. Penetrations or the roof shape may affect the position of the fixed clips area. Elevations with variable fixed clip areas must be separated by separating strips.
Roof pitch |
Position of the fixed clip area* |
> 3°–5° (> 5%–9%) |
in the middle of the panel |
> 5°–10° (> 9%–18%) |
in the upper third of the panel |
> 10°–30° (> 18%–58%) |
in the upper quarter of the panel |
> 30° (> 58%) |
at the top of the panel |
* Roof penetrations may change the position of the fixed clip area.
A Fixed clip area |
B Sliding clip area |
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