Partial factors for materials for serviceability limit states γC and γS
Eurocode 2 part 1-1: Design of concrete structures 2.4.2.4 (2)
The values for partial factors for materials for serviceability limit state verification should be taken as those given in the particular clauses of this Eurocode.
Recommendation
The recommended value of the partial factors for materials γC and γS for situations not coverd by particular clauses of this Eurocode is 1,0.