Stockschrauben eignen sich für Dächer mit Wellblech, Trapezblech, Sandwichplatten, Welleternit und Bitumenschindeln. Entscheidend ist eine tragfähige Holz- oder Stahlunterkonstruktion.

Stockschrauben sind i.d.R. nur für Holzunterkonstruktionen geeignet. Solarbefestiger gibt es auch mit Feingewinde für Stahlträger – ideal für Metallunterkonstruktionen. Es gibt jedoch auch beide Schraubenkategorieren für verschiedenste Untergründe.

Die Länge hängt ab von Sickenhöhe, Aufbauhöhe, ggf. Dämmung und der Rahmenstärke der Module. Wichtig ist, dass das Schraubengewinde vollständig im Träger verschraubt wird (bei Holzträgern ca. 7 cm).

Immer auf der Hochsicke/Wellenberg, möglichst mittig auf der Pfette oder einem Stahlprofil. So werden statische Kräfte optimal übertragen und die Dichtigkeit sichergestellt.

Für Holz: mit einem 7 mm Bohrer bei M10-Schrauben. Für Stahlträger hängt die Bohrweite von der Dicke ab (z. B. 6,8 mm bei 1,5–5 mm Stahl).

Bei Welleternit- oder Faserzementdächern ist die Kalotte zwingend notwendig für die Abdichtung und Statik. Bei Stahlprofilen kann sie optional sein, je nach Schraubentyp.

Die untere Mutter wird so angezogen, dass die EPDM-Dichtung satt aufliegt, aber nicht gequetscht wird. So ist das Bohrloch zuverlässig abgedichtet.

Die Montage auf Sparren ist schwieriger, da sie nicht immer unter der Hochsicke verlaufen. Eine sichere Verbindung ist nur möglich, wenn die Sparren parallel zur Sicke verlaufen. Alternativ kann man mit Brücken arbeiten.

Die Schraube muss exakt senkrecht eingebaut werden, mit sauber sitzender Dichtung. Optional kommen Kalotten oder Ersatzbleche zum Einsatz, z. B. bei Bitumen oder Eternit.

Ja. Die Mutterposition kann variiert werden, um eine plane Trägerfläche herzustellen – ideal bei unebenen Dächern.

Yes – when installed correctly with a rubber seal, dome cap and the correct torque, the roof penetration will remain permanently rainproof.

Hole-in-the-wall screws are made of A2 stainless steel. Nuts and washers are also made of stainless steel, while the sealing washer is made of UV-resistant rubber.

Yes. Calottes are used here, with an EPDM flange plate or replacement sheet metal if necessary. It is important to ensure a secure seal with a dimensionally stable contact surface.

The hole should be drilled perpendicular to the roof surface. Use a drilling aid or align the screw visually using the roof surface as a guide.

Depending on how it is embedded in the wood, a hanger bolt can absorb tensile forces of over 1 kN. The screw-in depth and wood quality are decisive factors.

Yes. PROFINESS offers various lengths from 180 mm to 400 mm and with diameters of M10 or M12 – depending on the roof structure, insulation thickness and corrugation height.

The lock nuts allow the support height to be adjusted with millimetre precision. This ensures an exact contact surface even on uneven roofs.

Yes. The threaded rod (M10 or M12) can be combined with all standard PV mounting rails. Adapter plates connect the screw and rail.

Usually four – two per rail. The number may vary depending on the wind load zone and module size. Static preliminary planning is recommended.

Yes, careful dismantling allows for reuse – provided that the components were not damaged during dismantling.

The rails are mounted perpendicular to the corrugated or trapezoidal structure – parallel to each other. They rest on the adapter plates, which are connected to the hanger bolts and fixed in place there.

A flange plate connects the hanger bolt to the mounting rail. It serves to distribute the load and as a fixing point for the respective screw connection.

Yes. Flange plates with slotted holes and height adjustment on the hanger bolt allow for compensation for uneven roofs or different purlin heights.

With suitable rail connectors. These are inserted into the rails and secured with two screws – load-bearing and electrically conductive.

Yes, the hanger bolt solution is particularly suitable for compact systems with 1–4 modules, especially for carports, garages or garden sheds.

All standard aluminium rails with underside for M10 screw connections. Profiness mounting rails are compatible with hanger bolt mounting.

As a rule, there should be at least 3.5 cm between the module and the roof to allow for rear ventilation. This is determined by the nut height and adapter.

No. Coffin bolts are only suitable for wood and, if necessary, steel substructures. Special roof hooks or bolt anchors are provided for brick or concrete.

Yes. The standard hanger bolts are M10 or M12. M10 is standard for PV, M12 for higher load requirements or larger profiles.

In such cases, the rail system should be offset accordingly or an auxiliary piece of wood should be attached. Screw connections outside load-bearing substructures are not permitted.

Depending on the snow load zone, shorter screw spacing and, if necessary, additional screws per rail may be required. A static design by PROFINESS is recommended.

The screws transfer the forces directly into the supporting structure. It is important to use a sufficient number of correctly positioned screws and a stable substructure.

No. Installation without a supporting substructure (e.g. wooden purlins) is not permitted. Corrugated sheets alone do not offer sufficient load-bearing capacity.

The hole must not be reused. The hanger bolt would not hold securely. The screw point must be moved and the old hole sealed.

Yes. The tightening torque is typically 15–20 Nm. A torque wrench ensures uniform preload and sealing effect.

Yes – with torque limitation or subsequent check with a torque wrench. Slow tightening prevents overheating and damage to the seal.

For larger installations or public projects, installation documentation is recommended. Profiness can prepare the relevant planning documents for each specific project prior to installation.

Yes – if the lower base layer is made of wood. For steel profiles, a different type of screw may need to be used. Important: Pre-drill through top layers + ensure secure sealing.

Yes – e.g. direct screw connection to trapezoidal sheet metal, roof hooks for tiled roofs or mounting systems for flat roofs. The choice depends on the type of roof.

In the download area of the PROFINESS website, in the assembly instructions or on request directly from customer service.

The wood is probably torn or too soft. The screw must not be used again. Please choose a new position and seal the old hole.

Yes. PROFINESS also offers height-adjustable hanger bolts for precise level compensation on sloping or uneven roofs.

Yes. Sealing discs, nuts, caps and flange plates are also available individually in the shop or on request – ideal for repairs or retrofitting.

Metal parts (screws) can be disposed of in the metal container, EPDM seals in the residual waste.

On request, yes – individual components such as nuts, flanges or EPDM covers are also available in black for a harmonious overall appearance.

PROFINESS keeps standard lengths in stock at all times. Delivery usually takes place within 1–2 working days after ordering – even for larger quantities.

Yes – our customer service team can assist with special solutions. Send us pictures and information about the roof construction and we will help you make the best choice.

Not the screw connection itself. However, the PV system must be registered with the grid operator and, if necessary, reported to the building insurer.

Yes, PROFINESS is planning a series of videos for DIY and professional installation. The first clips are already available on YouTube or can be obtained from Support on request.

All relevant information can be found in the download area at www.profiness.de, in the shop under the products or on request directly from our customer service.