K_mod is the modification factor for the load group to which the required load capacity belongs. If the ridge is prevented from rotating, the load capacity R_1,k, in an assembly with only one PFU beam anchor, will be half of the load capacity.

R_2,k = R_3,k: it is assumed that the force acts max. 20 mm above the beam. Nails are placed as close to the underside of the ridge/top of the beam, taking into account minimum edge distances. When using 4 PFU beam anchors per joint, the table values can be doubled.