is it OK to lay an engineered wood floor that is 27' long without putting a T-joint in the middle to avoid buckling?
In my own personal experience of this, the floor is capable of enormous movement,
even if you undercut at the skirtings. Avoid long, expanses without expansion joints if possible. My floor used to rise, like a small hill, then open into canyons, dependent on the change in the weather and humidity. Remember too, being on edge, it's strong enough to push a wall down!