5
General safety instructions
Ensure adequate load capacity (based on dimensions, condition and material properties) of the substructure,
support structure and other affected layers of the roof (such as an insulation layer).
Materials suitable for the ballast include concrete slabs, gravel or similar. If gravel is used, it must be secured
against rolling away.
When using ballast for position stability, make sure the substructure has sufficient reserve load capacity.
Check whether protective mats are needed.
• If so, be sure that they are of suitable materials.
• If you are uncertain as to the compatibility of the protective mat and roof flashing materials, we recommend
putting in a separating mat layer.
Make sure that the runoff of rainwater is not impeded.
Consider any physical or structural issues.
Any assessment of structural or functional suitability of the roof to support the PV array should be conducted
by a qualified professional such as a structural engineer.
Protect cables from weather, UV light and mechanical damage using suitable precautions (such as UV-resis-
tant plastic or metal conduits).
The distance between the module rows is calculated individually from the angle of inclination of the modules
(28°) and the minimum angle of insolation at your location.
Safety information for the edge areas
The Suntub may not be installed within the edge or corner areas of the roof. These areas are subject to air turbulence
and considerably elevated wind loads (see EC1, Wind loads).
A2
System design
a1
a2
h
w
d
Recommended edge distances a:
a
1
≥ 0,2 × h
a
2
≥ 0,2 × h
h Building height
w Building width
d Building depth
Fig. A2.1
