Caring For Your Pressure Treated Garden Product

So you've just brought a new wooden shed, structure or timber feature for your garden. It states that it has been pressure treated, but what does that actually mean? Check out our handy guide which will explain the benefits and concerns of owning a pressure treated garden product.

Created by Andrew Taylor on Wednesday, 14th of September, 2016.
Updated on Monday, 7th of November, 2016.


When buying a new piece of wooden furniture, shed, storage unit or structure for your garden, you may have a few questions in regards to what is meant by 'pressure treated'. Common questions include: what it actually is, how it affects the wood and if you'll ever need to paint or retreat the wood at home yourself.

Buying an outdoor product which has been classed as being 'pressure treated', effectively means that the wood will have already been through the process of having a preservative treatment forced deep inside the wood's pores, creating a barrier against rot and decay.

The benefit of buying a product which has already had this type of treatment means that, firstly, it would normally be provided with a longer guarantee against rot when compared to other products which have not been treated. Secondly, you wouldn't need to treat the timber yourself at home when it first arrives, which can save quite a bit of time and lets you set up and enjoy your new product even quicker! 

Here's our guide on the most common queries regarding pressure treated garden products:

Painting

If you plan on painting your garden product in order to change its natural colour, then this can be done at any time after receiving the product. We would recommend using a suitable branded outdoor wood paint solution such as those from Cuprinol, Ronseal and Sadolin. Your product can be painted straight away after receiving it and we would advise following the paint's guidelines on when re-painting would need to occur (normally once per year thereafter).

Re-Treating

Standard pressure treated wood normally comes complete with a long guarantee against rot, however you may wish to keep it topped up with a treatment in order to better protect the wood from the harsh rainy weather within the UK.

We would advise to use a branded outdoor wood preservative and re-apply a coating on a yearly basis in order to keep your timber product looking fresh, clean and protected as much as possible from weathering.

Adding treatment on a yearly basis will help to keep the timber looking in that "freshly cut" state. However, if you didn't plan on re-treating or painting the wood, then most of the wood used in our products will mellow into a silvery-grey colour over time.

Splits and Cracks

Timber is a natural product and so splits and cracks may appear, this is due to to the change in temperature from season to season and the change in humidity within the air, which can cause the wood to expand and contract.

This is a normal occurrence with natural wood and so splits and cracks are not any cause for concern. In 99% of cases, it will not affect the strength or structural integrity of the product.

Green Spotting

Patches of green spots on freshly cut pressure treated timber can often be mixed up as being a type of mould or fungi. This is by no means the case, and green spotting on wooden garden products is quite a common thing and is also perfectly natural.

It's caused by the pressure treatment process in which the treatment solution is forced deep into the wood. The green spotting is an after-effect of the treatment stage in which salt from within the wood is forced out of the timber, thus leaving the leftover green salt spots on the surface. Hence, seeing green spots on the wood is a good sign that your timber has been pressure treated fully.

Green spotting will naturally wear away with time, but can be brushed off with a broom on light areas, or with a brush and some water on more stubborn spotting.

These patches are not harmful and will not affect your product's lifespan.

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