Kiln Drying


Above: Artificial Kiln Dryers / © JJ Bernier

Kiln Drying is mandatory


Wood is a highly hygroscopic material: the humidity inside varies depending on the humidity outside. Unless a specific coating is applied, water exchanges will permanently occur between wooden material and its surroundings over its lifetime.

In order to ensure a suitable stability for timber (cladding, flooring, ceilings...) and an increased lifetime of glues and coatings, kiln drying is mandatory.

The process of kiln drying is based on monitoring water and air flows with a rise of temperature.


The KD cycle lenght shall vary depending on thickness of timbers and their humidity prior to the drying, the final required humidity, the species of timber etc.. The lead time could stand somewhere between a few days and a couple of months!


Humidity must be controlled according to the final use of timber.

For the record, here is a non-exhaustive suggestions of required humidity depending on the use (+/-2%):

- Flooring : 8%

- Wood furniture : 10%

- Indoor wood walls and ceilings : 12%

- Interior carpentry : 13%

- Outdoor carpentry and cladding : 15%

- Timber structures : 18%

- Fences, plots... : 22%


These levels of humidity are mandatories so the wood products can match the Building Standards.

Woodenha monitor each step of the process of kiln drying with dedicated probes and handle their KD cycle with extra care for improved results and client satisfaction.



Bois en séchoirs / © JJ Bernier
Chargement de bois ignifugé M1 en séchoir / © JJ Bernier

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