S:FLEX LEICHTmount Rail 2.0 flat roof frame

Aerodynamic system
with extremely low surface load

For south and
east/west orientation

Trapezoidal sheet metal rail
with holes
and sealing tape
Fast, direct installation
with rivets or
sheet metal screws
S:FLEX Flat Direct
Pitched roof installation
without roof penetration
For foil,
bitumen or
sandwich roofs
S:FLEX pitched roof system
For all kinds of tiled roofing
With laterally and height-adjustable roof hooks
From rafter widths of just 36 mm

Frame planning and ordering made easy

Planning tool login

From the design of the mechanical and electrical systems to the profitability calculation and output of the parts lists – everything required for a professional system design can be managed easily and precisely online. The S:FLEX Planning Tool lets you design PV systems for every type of roof and location from your office PC. (Due to the extensive options and graphical illustrations the application is not optimised for smartphones.)

In the following steps we'll show you how to use this S:FLEX service to quickly and precisely record and plan your solar roof projects in detail.


Here's how to use the tool:

Homepage of the S:FLEX Planning Tool site

In the first step after logging in, you can create new projects and manage your previously started or completed system planning.

Saving project information

Under the menu item "Project" you can save information such as the location of your project, the delivery address and information about the customer.

Locating a project using Google Maps
Project/Google Maps

You can also use Google Maps when creating your project. The location and details of the project can be specified via an address search, maps or satellite imagery.

Selection of roof types

Select the appropriate roof shape and roofing from the available types. Alternatively, you can define complex shapes yourself. Then enter values for the size, pitch, orientation, etc.

Interfering surfaces can be easily entered
Roof/Restricted Areas

Restricted areas, i.e. surfaces that are not to be covered by PV modules, or components that would cause shading, can be easily entered and are then displayed graphically.

Calculation of the snow load
Roof/Snow Load

Click the "Snow Load" button to open a window in which you can select regional values from a stored database or enter your own numbers.

Calculation of the wind load
Roof/Wind Load

Calculating the wind load is just as easy as selecting the snow load thanks to a database of wind zones and terrain categories. Optionally, you can also use your own values.

Selecting the PV modules
PV Modules

Inserting the modules to be used couldn't be easier – our searchable and sortable table contains over 40,000 products including their dimensions and power output. Or you can create a new module yourself.

The mounting system design

This is where you choose one of our S:FLEX system solutions for your previously defined roof. The mounting system is then dimensioned and adapted in all respects to the requirements of the specific roof.

Layout of the module area

The optimal layout of the solar generator is determined and displayed graphically. If required, the arrangement, row spacing or quantity of the modules can be modified manually within the framework of the project specifications.

3D View of the installation
Position/3D View

The three-dimensional view makes it easier to estimate the planning requirements. For this purpose, the system is displayed virtually at its location using Bing or Google Maps. It can be viewed from all sides, angles and zoom levels.

The CAD plan
CAD Plan

Via the "CAD Plan" menu item the module array is displayed as a design drawing. For further processing, the plan can be exported in various scales in the file formats DXF, DWG or PDF.

Detailed structural calculations

For ballasted systems, the required ballast per load point is displayed. For other systems, the tensile and compressive forces are shown. Structural values can be read for any point in the structure, e.g. at the junctions, mounting points, floor rails, etc.

Material overview containing all components

At the end of your work with the S:FLEX planning tool, you will see a material overview containing all components required for the planning and costing. The components are highlighted with prices and technical data and can be downloaded as parts lists in PDF, Excel or XML formats.

A comprehensive report
Output/Project Report

In addition to the material overview, you can also generate a comprehensive report. The roof data, design data, design layout, installation plan, structural details, material costs and all other project information can be output all at once or in any desired combination.

Our locations

We will be happy to answer your questions about our mounting systems and to advise you about your solar project. Of course, you can also use our contact form for specific enquiries about our frame systems.


United Kingdom

S:FLEX Mounting Systems UK Ltd
Unit 5, Skypark International
Blenheim Way
Liverpool L24 1YH
Phone +44 (0)151 448 5769

S:FLEX in Liverpool, UK


S:FLEX GmbH Headquarters
Reinbeker Weg 9
21029 Hamburg
Phone +49 (0)40 688 93 17 0
Fax +49 (0)40 688 93 17 99

S:FLEX Zentrale Hamburg


Elsäßer Straße 12
79189 Bad Krozingen
Phone +49 (0)761 888 56 08 0
Fax +49 (0)761 888 56 08 39

S:FLEX Freiburg


S:FLEX Nederland b.v.
Gasthuislaan 2.11
Phone +31 (0)521 34 40 29

S:FLEX in den Niederlanden


S:FLEX Mounting Systems S.L.
C/ d’America, 54
08205 Sabadell/Barcelona
Phone +34 627 432 559

S:FLEX Spanien

Middle East

S:FLEX Mounting Systems
P.O. Box 109
11947 Amman
Phone +49 (0)176 10 11 15 72

S:FLEX in Amman, Jordanien

Southern Africa

S:FLEX Southern Africa
37 Buckingham Road
3610 Kloof (Durban)
Phone +27 31 764 1940
Fax +27 76 765 4416

S:FLEX Southern Africa

South-East Europe

S:FLEX Hungary
Phone +36 30 268 9974


S:FLEX Inc. Colorado

Our practical experience for your work

As frame specialists with first-hand experience of planning and installing solar projects and the associated challenges, we also offer comprehensive technical support for our products. Fast processing and express deliveries to the building site – to ensure a smoothly running project for you and your customers – are part of our standard service. In addition, we support you with tailored services on request:

Services for installers

Services for dealers

S:FLEX flat roof frames


Aerodynamic and ballasted systems for flexible installation and optimal yields on flat roofs

S:FLEX pitched roof frames


Tiles, shingle, corrugated fibre cement, foil, sheet metal roofs... the right system for all types of roofing

S:FLEX ground mount systems


A stable and cost-efficient basis for profitable solar power plants on any substrate

S:FLEX productsS:FLEX systems


Download our product catalogue and system overview directly from here or in our Download area

S:FLEX planning tool


Our online tool makes it easy for our customers to create a detailed design of their PV frame system

S:FLEX Support


Technical support for our roof installation frames and ground-mount systems for dealers and installers

S:FLEX - service in Germany and around the world

We started out in Germany. Today, we have branches and partners in many countries in Europe, the Middle East, the US and southern Africa. We supply wholesalers, project planners and installers who have already helped to create many megawatts of solar power capacity worldwide using our systems. The demands customers place on mounting systems are precisely the features that we focus on the most during product development and production:

  • Fast installation and easy handling
    with a maximum degree of pre-assembly and minimal tool use
  • Corrosion-resistant materials and "Made in Germany" production
    for a long, maintenance-free service life and complete recyclability
  • With certification and seal of approval
    S:FLEX mounting systems have been tested and certified in accordance with German and international standards
  • Full compatibility with different modules and roofs
    for flexible use on all kinds of roofing and all standard module types, framed and unframed, as well as for retroactive module replacement

Our system solutions for diverse applications are characterised by well-engineered components – such as universal, clickable module clamps, height-adjustable roof hooks for particularly narrow rafters and non-penetrative attachments for flat and metal roofs.

If you have any questions or require additional information, please use our contact form or call us. We look forward to adding you to our long list of satisfied customers.