Installation guidelines
Installation guidelines
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PREVARIO PREFALZ

Easy installation and secure hold on PREFALZ and FALZONAL® double-lock standing seam systems. Installing the PREVARIO PREFALZ does not affect the longitudinal expansion of the strips. Mounting is possible on preformed fixed clips, preformed sliding clips and preformed long sliding clips. During installation, the statically determined centre-to-centre seam distance and the statically determined maximum spacing between clips must be taken into account. 

  • Clip spacing according to wind load calculation (max. 33 cm)
  • Only to be used in combination with a PREFALZ or FALZONAL® double-lock standing seam, installed in accordance with the applicable standards and specialist guidelines.
  • The PREVARIO PREFALZ is only designed for systems parallel to the roof (and is not suitable for inclined installations or for any other type of mounting).
  • The precise number of parts required can be determined either via the PREFA Product Technology department or by a structural engineer.
  • Used also for panels with 25 mm clip relief.

1 PREVARIO PREFALZ
2 Mushroom head bolt and nut M10 (SW 17)
3 Threaded rod with nut M12 (SW 18)
4 Rail holder

Technical data PREVARIO PREFALZ

adjustment range

36 mm

fasteners

clamping on the double standing seam

colour

uncoated

components

Rail holder (EN AW 6005A T6)
Fixing screw M8 × 30, stainless steel (T40)
Threaded rod M12 × 90, stainless steel
2 flange nuts M12, stainless steel (SW 18)
2 mushroom head bolts M10 × 25, stainless steel (SW 17)
2 hexagon nuts M10, stainless steel (SW 17)
EPDM seal

Structural principles

Requirements of the supporting roof covering:

  • Double-lock standing seam made of PREFALZ or FALZONAL®
  • Fastening of the covering with PREFA clips and PREFA stainless steel grooved nails 28/30 or 28/25 or with PREFA stainless steel countersunk screws 4.5/30
    • Clip spacing according to wind load calculation (max. 33 cm)
  • Spacing from top edge of roof to top edge of PREFA profile rail ≤ 150 mm
  • Spacing between two seam clamps on the same seam ≥ 400 mm

Dimension the roof structure to accommodate the loads acting on it in accordance with the applicable standards.

Installation

In the area in which the solar panels are mounted, the maximum centre-to-centre spacing between clips must not exceed 33 cm. 
The screws should be loosened before mounting the solar bracket.

Pay attention to the direction in which the clamp is mounted. When installed, the bracket should be oriented so that the threaded rod can be mounted on the seam side. Tighten the two stainless steel nuts with a torque of 35 Nm (wrench socket 17 mm).

Loosely attach the threaded rod with the profile rail bracket and lock nuts. Tighten the nuts by hand so that you can later adjust the height of the profile rail holder if necessary (open end spanner 18 mm).