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Design information regarding installation on pitched roofs — above roof installation
Support on pitched roofs
(For rafter anchors in conjunction with collector supports from the flat
roof installation range, see page 128.)
On pitched roofs with a low angle of inclination, the collector supports
can be secured to the rafter anchors with the mounting rails.
14.2 Above roof installation with rafter hooks
General information
Observe the information on securing collectors on page 110.
■ This mounting system is suitable for standard roof tiles (except
Harz tiles and double-S tiles). It is designed for wind speeds up to
150 km/h and snow loads up to 1.25 kN/m
■ The fixing system comprises rafter hooks, mounting rails, clamping
brackets and screws.
■ Guarantees a permanently safe application of force to the roof struc-
ture. This reliably prevents tile breakages.
■ For above roof insulation, secure the rafter hooks on site.
For this, the screws must reach at least 80 mm into the load bearing
wood structure to ensure sufficient load bearing capacity.
■ Any unevenness in the roof can be compensated for by adjusting the
rafter hooks.
Criteria for selecting the fixing system:
■ Snow load
■ Roof with or without counter battens
Rafter hook
■ Rafter hooks are fully zinc-plated at high temperature to protect
against corrosion (galvanised, 70 μm coating thickness).
■ Rafter hooks are mounted directly on the rafters on roofs without
counter battens.
■ On roofs with counter battens the rafter hook is secured directly to
the counter batten with a support bracket.
Vitosol-F flat-plate collectors
Vertical and horizontal installation
A Collector
B Rafter hook
C Mounting rail
D Mounting plate
VITOSOL
Check the structural condition of the roof.
2
.
B Rafter hook
E Support bracket
F Rafter
G Counter batten
A
B
C
D
E
B
G
F
VIESMANN
(cont.)
14
117
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