EN 1995-1-1 - Section 2.3.1.3. Service classes
(1)P Structures shall be assigned to one of the service classes given below:
NOTE 1: The service class system is mainly aimed at assigning strength values and for
calculating deformations under defined environmental conditions.
NOTE 2: Information on the assignment of structures to service classes given in (2)P, (3)P
and (4)P may be given in the National annex.
(2)P Service class 1 is characterised by a moisture content in the materials corresponding to a
temperature of 20C and the relative humidity of the surrounding air only exceeding 65 % for a
few weeks per year.
NOTE: In service class 1 the average moisture content in most softwoods will not exceed 12 %.
(3)P Service class 2 is characterised by a moisture content in the materials corresponding to a
temperature of 20C and the relative humidity of the surrounding air only exceeding 85 % for a
few weeks per year.
NOTE: In service class 2 the average moisture content in most softwoods will not exceed 20 %.
(4)P Service class 3 is characterised by climatic conditions leading to higher moisture contents
than in service class 2.