How do I stop my laminate floor from crackling ?

Not enough space at perimeter edges quite likely. I saw this in a flat I was viewing once. They person who laid the laminate had actually plastered in the edges with filler! Oops. Sure you havent done that but combo of not enough expansion space and central heating may be the cause. No alternative other than to remove (file?) material off the edges.

Scottish lass
November 2008