FAQ – Flat roofs

❓ FAQs about installation on flat roofs

1. Für welche Dacharten ist das PROFINESS Flat System geeignet?

Für Flachdächer mit Folienabdichtung, Bitumen, Kies, Beton, Gründach und Sandwichplatten.

2. Brauche ich eine Dachdurchdringung zur Befestigung?

Nein. Das System ist auf reine Ballastierung ausgelegt, d. h. es wird ohne Dachdurchdringung montiert.

3. Wie viel Dachneigung darf mein Flachdach haben?

Bis zu 5° Dachneigung sind zulässig. Darüber hinaus ist eine Sonderprüfung notwendig bzw. muss des System bauseits verankert werden.

4. Muss ich das System zusätzlich beschweren?

Ja. Je nach Wind- und Schneelast ist eine ausreichende Ballastierung (z.B. mit Betonplatten) erforderlich.

5. Gibt es eine Planungshilfe für die Ballastierung?

Ja. Die Profiness-Planungshilfe berechnet dir die benötigten Ballastgewichte individuell für dein Dach.

6. Kann ich das System auf Kiesdächern einsetzen?

Ja. Die Kiesschicht muss eben und darf max. 3–5 cm tief sein. Kies unter den Auflagen entfernen.

7. Ist das System mit Gründächern kompatibel?

Ja. Sofern die Begrünung niedrig ist, kann mit dem herkömmlichen System gearbeitet werden. Aber auch für höheren Bewuchs haben wir eine Lösung, sprechen Sie uns gerne an.

8. Gibt es verschiedene Aufständerungsrichtungen?

Ja. Es gibt Süd-, Ost/West-, First- (dachparalleles Beschwerungssysteme) und Alpin-Systeme – je nach baulichen und örtlichen Gegebenheiten.

9. Wie hoch ist die Modulausrichtung bei Süd- oder Ost/West-System?

Standardmäßig 10° Neigung bei Ost/West-Systemen, bzw. 10° oder 15° bei Süd-Systemen.

10. Benötige ich spezielles Werkzeug für die Montage?

Nein. Es reicht ein Innensechskant, Akkuschrauber und ein Zollstock oder Laser für die Ausrichtung.

11. How do I start setting up the system?

Start by laying out the base rails (module supports), aligned according to the module plan. The row spacing is determined by the length of the transverse modules.

12. Do I need to place a mat under the system?

No. The system has building protection pads under all system feet to prevent damage to the roof covering.

13. How do I align the module rows neatly?

Use a string, laser or our positioning aid to align the rows precisely before connecting or ballasting them.

14. Can I also set up the system without row connectors?

You can also place the modules individually. However, row connectors ensure stability and reduce ballasting. The larger the connected module field, the less ballast is usually required.

15. How is the first module attached?

With an end clamp on the first module carrier – insert the module, then attach the clamp and screw it tight.

16. How much space should I leave between the modules?

The distance between the modules is determined by the system’s base rails.

17. Which screws do I tighten with which torque?

Klickfix module clamps with 8–10 Nm, conventional clamps with screws and slotted nuts with 12–14 Nm. Always use a torque wrench!

18. How are the modules earthed?

We offer components such as equipotential bonding terminals, aluminium round wire, etc. for earthing in our online shop. For a final earthing concept for the system, please contact your electrician.

19. What to do if the ground is uneven?

Create a smooth support surface! Level with rubber mats or panels – do not correct with the system itself.

20. Can I also install the system in a single row?

Yes, especially for small roofs. Ensure correct ballasting.

21. What clamps are used to attach the modules?

Conventional middle and end clamps that are screwed into press-in nuts located in the frame. They are suitable for all standard module frame thicknesses.

22. Can Klickfix clamps be used on flat roof systems?

No. We use conventional clamps and screws for our flat roof systems.

23. Do I need an additional slot nut for flat roof racks?

No, the screw connection is made in the existing press-in nuts in the frame.

24. How do I neatly finish a series of modules?

With end clamps. Wind deflectors are also installed on south-facing systems.

25. When should I use wind deflectors?

With our south-facing systems, you need one wind deflector plate per module. It minimises wind loads under the modules.

26. How do I attach the wind deflectors?

With the screws provided in the rear support of the frames. Press-fit nuts for screw connections are also already provided here.

27. Do the wind deflectors need to be earthed?

Yes, it is advisable to earth the entire system – please contact your electrician. Profiness offers components for earthing flat roof systems.

28. What are row connectors and what do I need them for?

They connect several module carriers together – for mechanical stability and minimal ballasting.

29. How many modules fit into a typical east/west row?

That depends on the space available on the roof. Please feel free to use our enquiry form. We will plan your system free of charge.

30. Can I also raise only one side (e.g. south)?

Yes. The South system is designed for single-sided mounting with a 10° or 15° inclination.

31. What is the Firstsystem?

A roof-parallel ballast system that is connected via the roof ridge.

32. How does the Firstsystem differ from the normal East/West system?

In the ridge system, the modules are aligned parallel to the roof, meaning that the angle of the roof determines the angle of the modules. East-west systems are designed for flat roofs, with a standard module mounting angle of 10°.

33. What is the Alpine system?

A particularly stable flat roof system for high snow and wind loads. Designed for maximum load-bearing capacity (e.g. in alpine regions).

34. When should I use the Alpine system?

In regions with high snow loads (e.g. snow load zone 3) or strong wind pressure.

35. Are there any special requirements to consider for first or alpine systems?

Yes. However, these are two fundamentally different systems. We automatically take all relevant factors into account in the individual planning we create for your system.

36. How large must the row spacing between module rows be?

This varies depending on the system. You can find the grid dimensions for our systems in our brochures and installation instructions.

37. Is there a maximum length per module row?

Yes. For a maximum of 12 modules, row breaks should be planned to allow for thermal expansion of the material.

38. How is the cable routing implemented in flat roof systems?

With cable ducts or UV-resistant cable ties underneath the modules along the module supports.

39. How can a clean module finish be achieved on small surfaces?

We have shortened systems that allow as many modules as possible to be placed even in small areas.

40. Can I use the systems on small areas and garages?

Yes. Our shortened systems are ideal for small roofs. Pay particular attention to wind load and ballast carefully!

41. How do I ballast correctly?

Always according to the design. Place concrete slabs (e.g. paving slabs) centrally on the designated ballast supports (ballast feet).

42. What ballast weights are common?

This can vary greatly depending on the region, wind and snow loads, and other factors. The exact amount of ballast required is calculated on a project-specific basis.

43. Can I also use water canisters or paving slabs as ballast?

Water canisters are not recommended. Only use weather-resistant, permanently dimensionally stable objects. Paving slabs are well suited.

44. What do I need to bear in mind for edge and corner areas?

The wind load is particularly high here. More ballast or even bracing may be necessary – please take individual planning into account.

45. How is earthing carried out in flat roof systems?

Via equipotential bonding terminals on beams, terminals and series connectors – in accordance with VDE guidelines.

46. Do I have to earth all module frames?

No, if all terminals with integrated earthing have been used and correctly screwed in place. For further information on earthing, please contact your electrician.

47. What should I do if individual modules are heavily shaded?

Shorten the row or change its position. Shading significantly reduces the overall yield.

48. How do I maintain the system?

Visual inspection once a year: Check the position of the modules, clamps, ballast, contamination and cable routing.

49. Can I dismantle the system without leaving any residue?

Yes. The system is not usually screwed into the roof. Remove the ballast, take off the modules, loosen the supports – done.

50. Are there assembly instructions?

Yes. The complete assembly instructions (PDF) are available for download.

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