Attach K2 roof hooks with flat head screw
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Attach K2 roof hooks with flat head screw Connecting Strength

Content • Intruduction • Requirements4 · General4 · Screw diameter 4 · Screw length in relation to rafter height 4 · Edge distances 5 • Installation6 · General6 · Underlay of the roof hook 6 · With on-roof insulation 7 Tested quality - certified several times K2 Systems stands for secure connections, highest quality and precision. Our customers and business partners have known this for a long time. Independent bodies have tested, confirmed and certified our competences and components. At k2-systems.com you will find our quality and product certif

Intruduction The screw connection between K2 roof hooks and the roof substructure has the task of transferring the forces acting on the photovoltaic system via the roof hook and the screws into the supporting roof substructure and thus guaranteeing the stability of the photovoltaic system. K2 Systems recommends the use of HECO stainless steel screws for fastening its roof hooks. These are of high quality and ensure a secure and good corrosion-resistant connection. The round oblong hole pattern of the K2 roof hooks has been matched to the flat head screws in particular, so that the...

Requirements General Before installing roof hooks, it must always be checked whether the roof is capable of bearing the additional load of a photovoltaic system and the resulting changed loads. This usually requires a structural analysis. In the case of existing roofs, the condition of the structure, in particular the load-bearing timbers, must also be inspected on site. The regionally valid building regulations in this regard must be observed. The values required for the calculation for the plate head screw can be found in the particular ETAs. The calculation method is specified by...

Edge distances Eurocode 5 and the European approval ETA specify minimum edge distances of the screw to the end-grain end and to the unloaded lateral edge (a1) of the rafter in relation to the screw diameter. The minimum distance between the roof hooks on a rafter (a3) must also be taken into account. For K2 roof hooks with round oblong hole pattern in combination with flat head screws of the listed dimensions, the following distances apply: for Douglas fir wood, the value must be increased by 50% Min. edge distance to the rafter side Min. distance of ro

Installation General At least 2 screws must always be used to fasten a roof hook to the wooden substructure. The screws may be screwed with pre-drilling or without pre-drilling. If the screw diameter is 8 mm, you may only screw without predrilling if the wood type of the substructure is softwood. If you have to predrill (for Ø 8 mm and wood type hardwood), the recommended drill diameter for 8 mm screws = 6 mm for hardwood (5 mm for softwood), for 6 mm screws = 4 mm. Select as drive for shoring the screws for Ø 6 mm: T25 and for Ø 8 mm: T40. The maximum screw-in torque is 5.3 Nm for Ø 6 mm...

With on-roof insulation If on-roof insulation is present, the screw length must be selected so that the minimum screw-in depth of the screw in the rafter timber is maintained. For screws (S) from the manufacturer Heco, the minimum screw-in depth is four times the screw diameter (Øs). If the screw has a diameter of 8 mm, the minimum screw-in depth is 32 mm (A) and can be screwed into a counter-battening with a height of 40 mm. Please check the minimum screw-in depth of the screws you are using. If these conditions are not met (A), special screws for rooftop insulation in pressure-soft and...

Thank you for choosing a K2 mounting system. Mounting ystems from K2 Systems are quick and easy to install. We hope these instructions have helped. Please contact us with any questions or suggestions for improvement. Our contact data: • k2-systems.com/en/contact • Service Hotline: +49 (0)7159 42059-0 Our General Terms of Business apply. Please refer: k2-systems.com K2 Systems GmbH Industriestraße 18 · 71272 Renningen · Germany +49 (0) 7159 - 42059 - 0 · info@k2-systems.com · k2-systems.com Screews Assembly EN V7 | 0623 · Subject to change Product illustrations are exemplary and may differ...