Fence Post 75 x 75mm – UC4 Treated

(1 customer review)


SKU: BRIANTS-558 Category:


Our UC4 fence posts are a great solution for those looking to upgrade on ordinary treated posts without swapping to concrete posts. We supply these 75mm square posts in a variety of lengths.

Common imperial reference  – 3×3 inches

What is UC4 treatment?

UC4 (user class 4) is the category or specification to which the timber is treated. This is a far superior class of treatment, which carries a 15-year life expectancy. The process starts with the type of timber being selected. Rather than spruce, these posts are redwood. The reason for this being that before being pressure treated the wood is kiln died, and redwood reacts much better and stays stable during this process. The actual pressure treatment process and chemical composition is the same as a UC3 spec’ treatment, but because the timber is so dry, the treatment is forced much further into the timber. The kiln drying will typically take the moisture content of the wood down to around 28% which is very low.

Are these fence posts suitable for all types of fence panel?

We would recommend these posts when installing Lap panels, our Milano or Harmony Panels. However, if you are installing closeboard panels then we would strongly advise you to use 100mm x 100mm fence posts as the panels are considerably heavier, and so need a slightly thicker fence post to hold them in position.

What length fence post should I buy?

The general rule is always buy a fence post which is around 2ft longer than the panels you are installing. In most cases 2 feet (or 600mm) in the ground is enough to hold a fence panel without issues, it’s rarely a good idea to have less post depth under the ground, but in areas where the ground is very soft, or if your fence line is in exposed areas which are likely to get the full brunt of high winds (ie. a property on a hillside) then it can sometimes be advisable to have 3ft (900mm) in the ground.

Fence Post Size Guide:

We also supply rapid set post mix for fixing posts into the ground. We typically recommend 1.5 bags per fence post as a general rule of thumb when ordering.

Product specification

  • User Class 4 Treatment (UC4)
  • 75mm x 75mm
  • Suitable for lap panels 
  • Not suitable for closeboard panels (see 100mm x 100mm posts) 

Additional information


UC4 Treated softwood

Suitable for

Lap panels


75 x 75mm

1 review for Fence Post 75 x 75mm – UC4 Treated

  1. Paul (verified owner)

    Correct dimensions and straight.

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