Advice:

Connection elements with corrosion protection (e.g. due to galvanisation) that are specified in the approval may only be used where the connection elements are not expected to become damp. In general, this applies to the inner shells of multiple-layered
roof and wall structures, in dry, predominantly enclosed spaces
as well as single-layered, unventilated roof structures with upper heat insulation and ceiling systems above dry, predominantly enclosed spaces.
Do not use the screw in applications with direct exposure to the weather or in wet rooms with atmospheres containing chlorine gas.