Description: Swiss chalet built as a summer home (Maine). Second floor ceiling has strapping nailed to the joists (rafter ties), with cardboard white tiles stapled to the strapping. The 1959 installed tiles is falling down plus I'm installing Andersen's on a gable ends and had to open the ceiling to reframe. Q: The ceiling joints are 2"x 4" x 30'(?) and 20"-24" on center. What are my choices to open up the ceiling and install sky lights? Can the licensed contractor install LVL's like every 4' or something if I remove the ties? How can I open up the ceiling?