Pressure Treatment vs Dip Treatment

If you’re buying a product which is made from wood and it’s going to go outside, whether it’s fencing, a garden shed or an arbour then you need to know about timber treatment.

Created by Andy Hobson (Alumni) on Friday, 25th of January, 2013.


Pressure Treated wooden Garden Sheds

The two main types of treatment that timber products made from softwoods like Arbours, Garden Buildings and Fencing experience are either Dip Treatment or Pressure Treatment.

Treatment is very important as over time timber will become susceptible to rot and insect attack which can severely damage it.

Dip Treatment

Dip treated products are generally cheaper and this is because the process of dip treating takes less time to do, leading to lower labour and storage costs.

If a product is dip treated the treatment will thin and fade over time and most manufacturers will require treatment annually to comply with their guarantee conditions. They will also advise that you isolate it from the ground using a pressure treated gravel board for example with fencing.

Although they are cheaper to buy, you need to weigh up what is important to you, whether you want to save money initially or to spend more time and money treating the product annually.

Pressure Treatment

The process of Pressure Treating or Vacuum Pressure Impregnation as it is officially know involves a longer process. Firstly the wood is dried naturally using air flow or a kiln, this removes moisture from the wood so it is ready to be treated.

Next the wood is placed into a pressure treatment tank, and air is removed via a vacuum. Then the tank will be flooded with preservative liquid, then the excess fluid is extracted using a vacuum again.

The low pressure of the wood draws the preservative deep into the grain of the wood making for a fully treated piece of timber.

Pressure treated products can usually be identified by their green tinge finish when new, but this will fade to a honey brown colour over time, naturally blending into your garden.

Weathering will not affect pressure treatment, so it will last much longer. Although if you do saw/cut a piece of pressure treated timber manufacturers will always advise to treat the newly exposed part.

Further Information

View all the Pressure Treated Sheds for sale on GardenSite with a 15 year anti-rot guarantee.

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