The maximum floor length you can install without expansion joint mainly depends on two things:
If the room is more or less square and if there aren’t too many indoor climate changes between weekdays and the weekend or during the day, then you can lay a surface of up to 10 metres long and 8 metres wide without extra expansion joints in the floor surface. With lengths of more than 10 m and widths of more than 8 m, there should be an intermediate expansion joint.
It is also recommended to foresee expansion joints under the doors between rooms to separate the rooms.
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