l had laminate (floating) flooring installed 5 years ago. l am happy with the product, however it spans two 12 by 12 rooms. these rooms are connected by a 4ft. opening. Every summer the planks (running paralel with the opening) start to buckle with the humidity. Is it acceptable to put an expansion joint in the door opening to releive this stress. if so, what's the best way to make the cut without disturbing the rest of the floor? Thanks for any advice.