Door jam between rooms is drywall
With such an installation, I'd suggest that you DO NOT touch the drywall. It will not react to cutting the way a wood jamb will. You would most likely end up pulling on the corner, and causing cracks above it. Additionally, if you attempted to do such a thing, you will end up with a very ugly mess down there. This is drywall and not wood.
I say again: DO NOT attempt to cut the drywall corner in any way.
Leave the drywall corner where it is.
Consider one of 2 options:
1.) Install a threshold, transition or diffusor strip over the opening area, that will allow the laminate to continue to float.
2.) Install shoe-base (base-shoe), over the edges of lower drywall jambs to cover the expansion gaps of the laminate. You may be able to install it returnign the ends, or tastefully "meld" it into any adjacent trim (base).
- Build Well -