Replacing window header without tearing up my ceiling
I am doing a garage addition that will include an overbuild of the existing house (garage will have 15.5' ceiling, that part of the house just 8' ceiling). Engineer I had come out for a consult said the 2 ply 2x6 YP header above this window will need replaced with a same-sized 2 ply LVL header to handle the additional load. This part of the house was built in 1955 and just has a single top plate. Site-built trusses are 24" OC, and the header above this window is 46.5" wide. I assume it's not a good idea to try to replace the header without adding a temp wall inside to support the load? My concern is tearing up the drywall and/or texture on the ceiling. I plan to make the temp wall ~8' wide to distribute the load; but is there anything else I can do to protect the ceiling? Add some sill plate foam gasket material between the top of the temp wall and ceiling? I spent 2.5 years remodelling this house on my "free time" so I could move into it... trying to minimize how much stuff has to be redone just a year later. Thanks in advance for the help!