hi guys, new here. like what i see so far. i have a cape cod w/ a gable roof now. i want to add approx. 8 ft to the back exterior wall and raise the roof to almost a flat pitch. its 9'-6" to top of ridge. 24' run front to back. or 12' from ridge to exterior wall. here in prairie village, kansas they use 2000 IBC and IRC. any pointers on what i need for a rafter to cary load. do i need rafter legs? as for the ridge i would like to span as far as is reasonable. how far will a LVL span between ridge legs.?