Manufacturers have patented lock mechanisms which connect laminate flooring planks together. Certain locks and quality can restrict floor dimensions. Cheaper quality planks need an expansion joint every 6 metres, while better quality lock mechanisms on laminate flooringcan go beyond 10 metres. Manufacturers also have varying standards on gaps that can appear between the panels. The lock plays a vital role in strength, determining expansion and contraction of laminate flooring. Depending on temperature, wood laminate floors expand on average 1mm for ever metre laid. It is of utmost importance that installers allow correct expansion and cross structure when laying your laminate floor.