The PREFA joint is a butt connector for two sidings and can only be used for siding, siding.X and perforated siding with or without a shadow gap and stop end. The PREFA joint is only available in standard widths.
Note
When used in combination with perforated siding, the PREFA joint is not perforated.
If using the PREFA joint, sidings can be installed vertically and horizontally with a maximum length of 2.500 mm. The width of the PREFA joint is 15 mm and corresponds to the shadow gap, and can be installed independent of the substructure. To butt join sidings without using the PREFA joint is not recommended, since the material expansion cannot be absorbed under tension.
The installation of PREFA joints directly on top of each other is not possible:
PREFA recommends an offset (x) with a min. spacing corresponding to the visible width (BB), e.g. for siding: 138×0.7 mm = min. offset 138 mm:
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