I need to trim 1 1/4" off two sides of the drywall panel that is the door to the attic area. I did not like how it was done when the house was built so I trimmed out the opening which made the opening 1 1/4" smaller (5/8" on each of the four sides). I thought I would just put in a new piece of 1/2" drywall which I had but came to the idealization the ceiling is 5/8 drywall. I know for a fact the walls are all 1/2" except the garage wall that is shared with the house which I believe has to be 5/8 to meet fire code.
I would like to use the 5/8 that was the door but am not certain how to trim 1 1/4 off two sides. The score and snap method for small trims like this has never worked for me.
Suggestions??
Thanks