When Roof Snow Loads are used (see the Criteria – Member Loads command in RAM Manager) instead of roof live loads, the user can specify how the snow loads are treated when in combination with seismic loads. If the "Do Not Include Snow" option is selected, the snow load case(s) will not be combined with seismic load cases. If the "Use Full Factor on Snow" option is selected the normal load factors on the snow load case(s) will be used when in combination with seismic load cases. In some cases it is permissible to use a reduced snow load when in combination with seismic loads. If the "Use Reduced Factor on Snow" option is selected, the following factors on the snow load case(s) will be used:

For ASD, the normal factor is 0.75, the reduced factor is 0.2. For LRFD, the normal factor is 0.7, the reduced factor is 0.2.

When the IBC 2006 / ASCE 7-05 load combinations are selected it is assumed that the Wind and Seismic forces used in those combinations are also based on the ASCE 7-05 requirements, or are compatible with them.