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When laying your own laminate hardwood flooring, it is important to leave a 10mm space around the perimeter of the room as well as around any obstacles in the room such as pillars, heat vents, etc. The reason for this space is that the laminate core is made of wood. That means it is going to expand slightly with adjustments in the room's temperature and humidity. When the weather is warmer, or if the room's temperature rises, the planks will expand slightly so you'll want that small gap there to allow for the natural expansion. Without this 10mm space, flooring boards may buckle as they press against the wall or whatever obstacle is in the room.