Stable
Kayuna is made with a crossgrain plywood coreboard.
A cross ply construction of plywood makes Kayuna much more stable than "solid" timber floors and other engineered timber floors with a "lumber" core (the little strips of wood in the middle or core of the product).
Kayuna is produced with high quality cross layered wpb plywood.
A plywood core board improves stability.
There are different types of core-board available for engineered timber floors: "lumber" core (the little strips of wood in the middle or core of the product), HDF and plywood.
Although generally more expensive to produce, there are substantial benefits for plywood cores.
The simple rule is the more stable the core board, the less hassles and the happier the consumer. Tests have shown that an engineered timber floor with plywood core is much more stable, can be glued down and is installed easier than a similar product engineered with a lumber core.
A plywood core board also prevents the rippling effect that is often associated with engineered timber floors with a "lumber" core.
A common problem that can occur with traditional engineered timber floors with lumber cores, is rippling of the core. Rippling is caused by swelling of the lumber core because of changes in moisture content.
The small strips of wood (being hardwood or softwood) easily absorb moisture from the air and can start swelling. The effect is a rippling of the entire board (you can see this by holding the board against light and discover the "wave-like" pattern over the length of the board).
Since plywood core boards do not have the potential of rippling, and are much more stable, we constructed Kayuna with a plywood core. It also allows much more controlled expansion and contraction, to the extend that it is mathematical predictable. This means that it can be installed hassle-free in most applications.
A plywood core has a higher indentation resistance.
A hardwood plywood core also has a higher indentation resistance than products made with "lumber" core (the little strips of wood in the middle or core of the product).