Re: laminate flooring issues
Is the buckling occurring within the doorway itself or is it the planks along the wall on either side of the doorway?
What I would try to do is determine if the expansion gaps around each room (approx 3/8" between flooring and wall ) are large enough. What I did when I installed a large expanse of flooring was to keep the minimum gap distance from the face of the drywall, but made sure the flooring could travel under the drywall if necessary, alleviating any possible binding issues that could cause the buckling that you're describing. The baseboard easily covered the perimeter gaps.
If you want to forgo all of that, you can cut the centerline of the threshold of the doorway from jamb to jamb and install a T-molding strip that matches the floor. The T-molding will give you additional expansion space at the doorway alone. Now, this will only work if the buckling is within the jambs of the doorway, it won't do anything for buckling occurring within the room or along the walls of the room adjacent to the doorway.
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