Guidance on the Use of Oak in Construction

In this article we look at the use of Oak in construction, considering the following three types:

• Green Oak - Recently felled oak with a moisture content between 60%-80%
• Air Dried Oak - Naturally stored oak with a natural seasoning process moisture content up to 30%
• Kiln Dried Oak - Processed seasoned timber with a moisture content between 15% and 20%
  

Identifying Green, Air Dried or Kiln Dried Oak

Where timber has been dried and has a moisture content less than 10%, it will usually be marked with a stamp saying “DRY” or “KD” (for kiln dried), however, if timber has been cut or machined, it is likely these stamps are not visible. In such circumstances it is recommended that proof of purchase confirming that timber is kiln dried should be provided.

This article reviews various scenarios where oak could be used and beneath each, there is a table detailing whether it is acceptable to meet Premier Guarantee warranty standards.

The table relates to the oak type and the applicable policy as a simple ‘yes’ or ‘no’, to determine whether it can be accepted. Please note that there may be additional guidance required which will have been clarified for each scenario.

This article covers most examples where oak may be used in construction; please contact your surveyor for further clarification if required.