Trouble drying 8/4 oak
Drying 8/4 oak too rapidly will damage the wood. February 29, 2000
We recently put 8/4 red oak in our dehumidification kiln stacked at the top of a load of 4/4 oak. The 4/4 dried in good condition but the 8/4 had many surface checks. I had the controls set at 85 degrees F at the start of the batch and was only removing about 1 percent moisture content (MC) per day until the lumber reached 25 percent. I then increased the temp to 100 degrees F. Any ideas on what went wrong and how we can prevent this from happening in the future?
Did the one percent MC per day come from the 8/4 or 4/4? In general, 8/4 must be dried 2.5 times more slowly than 4/4.
What went wrong is that you dried the 8/4 too fast -- perhaps it was just a few hours every day that were too fast and then a few hours were too slow; the effect is damage to the lumber when drying too fast, even though the daily loss is ok.
You need to read "Drying Oak Lumber." Pub: Univ. of Wisconsin-Madison. Order from 608-262-9975. About $30.
- Gene Wengert, forum moderator
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Primary Processing: Kiln Operation
KnowledgeBase: Wood Engineering: Wood Properties
KnowledgeBase: Knowledge Base
All rights reserved. No part of this publication may be reproduced in
any manner without permission of the Editor.
Review Woodweb.com's Copyright Policy.
The editors, writers, and staff at Woodweb.com try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at Woodweb.com after considerate evaluation,
and at their own risk.
865 Troxel Road
Lansdale, PA 19446
Copyright © 1996-2021 - Woodweb.com