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If the roof hook cannot be fitted as shown above due to the form of the tile or the position of the
depression, it is imperative that a roofer is engaged. Changes to roof covering materials (roof tiles, clay
tiles, roof panels, cast stone, etc.) may only be made in accordance with the applicable roofing trade
regulations and the manufacturer's guidelines.
Important!
The leg of the roof hook lies in the depression in the pantile and must have a clearance of 5mm from the
surface of the tile. If necessary an underlay of suitable material should be installed in the space between
the rafter and the roof hook's base plate as per Figure 10.
The roofing must not be damaged by loads arising from the fitted roof hooks! If there is a risk of this
occurring, additionally install suitable supports to distribute the load. Especially with older tiles, plain tiles
and slate roofs and where the installation site is in a high snow load zone, the use of sheet metal supports
or tin tiles is recommended. The guidelines of the roofing manufacturer must be observed.
The securing screws in the rafters and the rafters themselves are extremely important for the overall
system stress. Chipboard screws are not suitable owing to their smaller head diameter. It must screwing
the roof hook to the rafter using two approved 8x100 respectively 6x100 flat head screws from our product
range, where no pre-drilling is required. Grease screws to facilitate fastening.
Roof hooks are suitable for most tile types. In individual cases, it may be necessary to remove small
pieces from the roof tiles using an angle grinder and suitable cutting disc to ensure that the tile sits flush.
The guidelines of the roofing manufacturer must be observed. Particular attention must be paid to the
accident prevention regulations when undertaking this work. If applicable, use wooden base blocks on
eccentric roof hook connections to distribute the load according to the following figure.
Figure 10: Roof hook load distribution
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Version 17.01, as of: 27-Jun-2017
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