The samples have been exposed to 80% rel. humidity until the moisture had increased by about 3 %.
SAUERLAND stile & rail material
- low swelling / shrinking due to structure of ‘vertical grain’
Spruce
- great variance of swelling and shrinking
- vertical annual rings : variation twice as high as of samples with horizontal rings
Consequence for door construction
Components within a door use to have lower moisture content than those exposed to open humidity.
This fact should especially be considered for :
- stile reinforcements
- second rails
- lock blocks
All components inside the door should have a structure of ‘vertical grain’.