Click system flooring has become very popular in recent times due to the ease in which it can be laid over existing floors and subfloors.
Click system floors come in the engineered wood and laminate variety, and when fitted, they lie on top of your existing floor like a giant jigsaw puzzle with tight, interlocking sections.
Most people do not realise that click system flooring is designed to be used on concrete subfloors. When this type of flooring is fitted to suspended floors, problems with creaking can occur.
When the floor is new, the wood contains a 6-9% moisture content. It is advised that you acclimatise the wood first before installing so that the wood can shrink or swell prior to locking the sections of wood together.
However, over time the wood naturally loses its moisture content causing the wood panels to shrink. This shrinkage means the floor sections are not snuggly fitted together and movement begins to occur in the interlocking sections. Over time, this movement leads to increasingly loud creaking and this is usually most noticeable in the summer when the heating is off and the floor is cool and contracted.
Shrinkage of the floor is a natural occurrence and not something flooring manufacturers talk about. If you use natural materials for flooring, shrinkage and swelling will naturally occur, so the creaking you hear is a natural by-product of using natural materials.