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Version 17.01, as of: 27-Jun-2017
4.4 ASD screws- Mounting on rafter-mounted insulation
systems
ASD screws are designed to install roof hooks on roofs with rafter-mounted insulation roofing. They are
designed so the insulation is fitted on the rafters, between the layer of rafters and the battens. This
insulation layer must not be subjected to static, individual loads, such as roof hooks. The loads from the
roof hooks are diverted through the space between the insulation to the load-bearing rafter design using
the ASD screws.
Note:
If the roof structure is too high over the rafters for the ASD scrwes, the roof hooks can also be fixed in the
counter battens. By the customer it must be proofed that the corresponding counter battens are fastend to
the substructure so that the additional loads can be absorbed and the function of the insulation is not
impaired. Observe the edge distances according Figure 121
Select the required screw length according to Figure 32 or using the IBC SOLAR AG PV Manager
dimensioning software. It is not required to drill bores before inserting the screws.
Figure 32: Overview of screw lengths
*) formwork + insulation + counter batten + integration depth 50 mm
Proceed as follows during mounting:
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