What is pressure-treated Timber?

Pressure-treated timber is wood that has been specially treated with a mixture of chemicals to make the timber more durable and long-lasting. This treatment is done under pressure which forces chemicals into the wood (thus “pressure treated” timber) The chemical used is called Tanalith E. Wood that has been pressure treated will be more resistant to rot, fungus, mould, and insects.

How is Pressure Treated Wood Made?

The process of pressure treating wood is quite a simple one. Firstly, wood is placed in a large tank that is sealed to create a vacuum. The Tanalith E treatment chemicals are then pumped into the tank, and forced into the wood to a depth of a few millimetres. The chemicals used in the process mostly consist of copper, which provides excellent protection against insects and rot. All the chemicals used in the process are safe and can be used around both children and animals without worry.

How long will pressure treated timber last?

A garden shed that has been pressure treated should mean that the wood used in the construction is rot proof for a good number of years. In general, the wood should be protected for about 30 years, and this is without any extra timber treatment being used.

Can I Paint pressure treated Wood?

Absolutely! Painting a pressure treated timber shed will keep it looking great but also gives the timber an added layer of protection, which can only be a good thing. However, you do need to be careful when painting pressure treated timber.

Do not paint your pressure treated shed immediately since moisture in the timber will mean that the paint will not stick properly. You will also need to buy the correct preservative to treat your shed. Preservatives do vary, so make sure to read the instructions. Look for a preservative formulated for exterior use and states on the can that it can be used on pressure treated timber.

How to treat pressure treated shed

You do not have to treat pressure-treated wood, though it is worth considering for a couple of reasons. Firstly, your timber shed will last longer if you choose to do some maintenance. Secondly, pressure-treated wood tends to change colour over time into a honey gold, and then a silver-grey. If you wish to avoid the woodturning grey as it ages, then treating it will help keep your garden shed looking as good as new.

When should I paint my Pressure Treated shed?

There is a lot of debate about how long you should wait before staining pressure treated wood. In general, you’ll need to wait for the Tanalith E to dry. If you’re looking to paint your pressure treated shed, then we recommended that you wait for around four weeks and then test a small area to ensure the preservative adheres to the timber cladding. Check the drying times and avoid painting you shed when rain is predicted.

Enjoy using your new shed.