Kiln Dried Oak Boards

Kiln-dried Oak is oak that has been dried in a controlled environment (a kiln) to reduce its moisture content. This process ensures the wood is stable and ready for use for indoor projects as well as some outdoor projects, reducing the chances of warping, cracking, or shrinking over time.

The length of the kiln-drying process depends on the thickness of the oak boards and the kiln's temperature and humidity settings. Typically, the process can take anywhere from a few weeks to several months. Thicker boards require more time to ensure the moisture content is evenly reduced.

Kiln dried Oak boards are used internally as they are more stable having had the moisture level reduced by mechanical drying. The moisture levels vary but we suggest using 8-12% kiln dried boards internally.


 

While kiln-dried oak is primarily suited for interior use, it can be used outdoors if properly treated and maintained with a high-quality sealer, oil, or varnish. However, green or air-dried oak is often preferred for exterior applications due to its higher moisture content and ability to acclimatise to outdoor conditions.

Yes, kiln-dried oak can be used in humid environments, but it's important to ensure proper sealing and maintenance to protect the wood from moisture absorption, which could cause slight movement over time.

• Kiln-dried oak has a lower moisture content, making it more stable and less prone to movement. Moisture content is typically 8% -12%.
• Air-dried oak dries naturally over time but usually has a higher moisture content, which can cause more movement in certain environments. The general rule of thumb for drying is one inch (25mm) per year. Green oak is freshly cut and contains a high moisture content, making it more prone to shrinkage and movement as it dries out.
• Green oak is freshly cut and contains a high moisture content, making it more prone to shrinkage and movement as it dries out

Kiln-dried oak is much more stable than green or air-dried Oak. While it may experience minimal movement in response to changes in temperature or humidity, this movement is significantly less than in other types of wood. It’s recommended to let kiln-dried oak boards acclimatise to their installation environment for at least 7-14 days before use. This allows the wood to adjust to the temperature and humidity of the space, reducing the risk of movement post-installation.

Sawn boards are left it their natural state once they have been cut by the mill saw. Planed timber boards have been smoothed and levelled and square using a Planer. If you require a planed oak board service, please contact us for pricing.

Kiln-dried oak is commonly used for:

• Furniture making (tables, chairs, cabinets)
• Flooring and staircases
• Wall panelling, interior cladding and skirting
• Doors and windows
• Joinery and custom woodworking projects

Yes, kiln-dried oak is ideal for woodworking projects where gluing or joining is required. Its low moisture content ensures a strong bond when using wood glue, and its stability means joints are less likely to shift over time.

Once planed or sanded to your desired finish, kiln-dried oak can be finished using various methods including oiling, staining, varnishing, or waxing. Kiln-dried oak can be finished to a very smooth surface ensuring easy application of finishes and allowing you to enhance its natural grain and colour.

Store kiln-dried oak in a dry, well-ventilated area away from direct sunlight or sources of moisture. It’s best to keep the boards stacked and off the ground to ensure air circulation to avoid any unexpected moisture absorption.

Yes, like most woods, kiln-dried oak will naturally change over time, especially if exposed to direct sunlight. The degree of colour change depends on the type of finish applied and the environment where the wood is used. Using UV-resistant finishes can help slow the process.
 

When cutting or machining kiln-dried oak, it’s essential to use sharp tools because oak is a hardwood. Dull blades can cause tear-out or burn marks. It’s also essential to wear appropriate PPE, as oak can produce fine dust that may cause irritation.

There are many different ways to grade Oak boards and it isn’t surprising that buyers are often confused by the varying standards and quality available.

Our oak board grading system can be found here:        Square edge Oak boards       Wayne edge Oak boards

We are always happy to discuss this with you before you buy from us.

As a wholesale business, we also sell in packs to keep costs down. Our packs are typically 25% cheaper than buying individual boards. 

By ensuring your boards are sourced from sustainable forests kiln dried oak is environmentally friendly. Schemes such as FSC (Forest Stewardship Council) and PEFC (Programme for the Endorsement of Forest Certification) provide certification that your oak has been forested responsibility.

H&H Forestry are proud holders of both certification schemes and commitment to only supplying 100% certified timber.