"F" to signify a floor with truss construction;
"R" to signify a roof with truss construction; and
"F/R" to signify both a floor and roof with truss construction.
425 ILCS 68/20
"F" to signify a floor with truss construction;
"R" to signify a roof with truss construction; and
"F/R" to signify both a floor and roof with truss construction.
425 ILCS 68/20