Pressure Treated vs. Dip Treated Timber

There are two main types of treatment that are commonly used with timber fencing and fence panels – dip treated and pressure treated. Both of these treatments are effective but which should you choose for your project? This is all you need to know

Brown Lap panels in yard

Dip treated timber
• Dip treatment, which is sometimes referred to as dipping takes place when the timber is immersed in a bath of treatment then removed and left to dry.
• The process adds a darker brown or golden colour and protection to the timber, however because it doesn't soak right into the timber it will fade over time. 
• The treatment protects the timber against insects and fungal decay. 
• Dip treated fencing is more cost-effective than pressure treated timber as the process is simpler. However, dip treatment fencing won't last quite as long as pressure-treated and may require additional applications of preservative by hand to give it the longest life possible.

Pressure treated timber
• This method of treating timber forces preservatives into the timber, right through to the middle.
• The process involves putting the untreated timber into a treatment tank which is then sealed and flooded with chemicals (ACQ). The tank is put under pressure to force the treatment into the timber as far as possible. The tank is then emptied of chemicals and the timber left to dry.
• These preservatives, like those in dip treatment, are highly effective against fungus and infestation of insects.
• Pressure-treated timber will last longer than dip treated so is slightly more expensive. 

Which to choose?
You need to weigh up the importance to you of the initial costs against the length of time you expect the timber to last and how much work you're prepared into looking after it. 
• Pressure-treated timber will have the longer lifespan – usually the process adds around 15 years to the timber. 
• Dip-treated timber will also give you years of looking great but this will require some extra care: namely, applying additional applications of preservative up to once a year in order to give the timber the longest life possible 

Help & Advice
If you need to know more about fencing and timber, please get in touch with your local branch. Our specialists will be happy to offer help and advice and can provide you with a free quote for supply of all materials.

1st Oct 2019