Seasoned Oak, Green Oak or Air Dried Oak?

One of the most common questions we get asked for construction of an Oak Frame Garage is “What is the difference between Seasoned Oak, Green Oak & Air Dried Oak?”

Green Oak

The term ‘Green’ has nothing to do with the colour of the oak nor does it reflect the colour that the oak will turn eventually. Green Oak refers to unseasoned sawn timber, usually fell within 3-18 months with a moisture content of roughly 30-80%. As a result of the high moisture content, when the oak dries out, it shrinks, moves and splits, making it hard to use anywhere close to glass. But brilliant to use in the construction of an oak frame garage, garden room or gazebo adding real character to the final finish.

Air Dried Oak

Air Dried Oak has been cut to size and left to dry naturally. However, it is common that they do not dry out completely. The benefit of using air dried oak means that during the drying out process, the majority of movement has already taken place and therefore less splitting and movement will occur once installed making this the perfect oak to use in sensitive areas where any movement could be inconvenient.

Seasoned Oak

Seasoned Oak is usually cut into boards, and stacked, separated with small battens allowing the timber to breath over a period of time, the moisture content is to be reduces to roughly 13%, making it much more suitable for window and door frame construction and roof rafters. It takes on average, 1 year per 25mm to season properly. During this slow seasoning process, the oak will stay relatively flat and straight, and protected at all times from rain. Seasoned oak, reduces movement and allows glazing methods such as those used in the construction of Orangeries, porches and Garden Rooms. For more information on which oak is suitable for your project get in touch with one of our friendly team today – Contact Us

What maintenance is required with an oak frame garage?

Oak has always been the choice timber for any wooden structure mainly for its strength and durability evident its character that is left for generations to come.
A common question posed to us is what aftercare and maintenance is required with an oak frame garage so here is our guide to aftercare and maintenance.

What are the black marks on an oak frame and what is the best way to remove them?

Naturally your oak frame may get a little dirty during and after the installation process. Also, due to the moisture content of green oak, you may also notice natural tannins which cause black stains to appear on the oak in certain areas. This is a natural process and the recommend way that these marks are can be removed is with using an oxalic acid solution.

Do you recommend treating my oak frame?

Again a common question but we always say there are no specific requirement for any maintenance of the oak frame itself. The natural sunlight on the frame over time will turn the frame to a silvery grey. Depending on your preference, the original, lighter colour can be retained if the wood is treated or sealed before it is exposed to the elements. One thing to be mindful of is once you start to treat the frame this will require ongoing maintenance yearly.

We would always recommend that you choose a test area first to make sure you are happy with the end result.

Will the oak move over time?

It is vital to remember that oak is an organic material and will settle in its own unique way – as the oak releases its moisture and dries it changes the way it looks and characteristics. The more it dries the lighter and stronger it gets. The way our buildings are designed means that as the timber dries the joints lock together to increase that strength. As the frame settles it will create its own unique splits or shakes which are normal and part of the settling process, more importantly part it really shows off the charm of an organic structure.

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