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How to Install Composite Fencing

James Bedingham

Created at: Nov 02, 2018

Last updated: Feb 16, 2021


At EnviroBuild, we offer a range of different composite products, including Hyperion fencing made from almost entirely recycled material and with high durability and water resistance.

This blog outlines exactly how to install composite fencing. For more detailed instructions, please get in touch or see our fencing installation guide.

Before You Start

The type of foundation underneath the proposed fencing area will determine the post substructure needed to support the fence:

  • For solid foundations such as concrete or masonry work it is recommended to use the Hyperion fence supports. To see more about Hyperion fence support installation see p.8 of our fencing installation guide.
  • If the fencing will be installed over soft – non/concrete foundations you can install posts using a round metal pole with a <44 diameter. To see more about this installation see p.9 of our fencing installation guide.
  • Fence post spikes can also be planted in soft foundations to support Hyperion fencing. To see more about post spike installation see p. 10 of our fencing installation guide.

The following set of instructions will assume the use of post supports on solid foundations.

Spacing the Fence Slats and Posts

To allow for the natural thermal reaction of the material to changes in temperature, please ensure that an expansion gap of 4mm is left between the fence slat and post. In addition, when measuring between post supports, you should also allow for the fence slat width (1774mm), the fence post width (100mm) and the fence slat expansion gap (4mm) so a total of 1874mm of spacing.

Fence Post Installation

Mark out the run of the post support centres using the fence section dimensions. Please note that the posts should always be on your side of the property boundary. Pre-drill 2x3mm pilot holes in the base of the post through to the stand inside (ensure holes are drilled in the centre of the post).

Place the metal post supports into position and, using a spirit level, check that the post supports are level and square to the run of fencing. With the supports in position, use the 4 pilot holes in the post supports to mark the support fixing holes to be drilled.

After pre-drilling the fixing holes to the correct depth, firmly secure the post stand before placing the fence post onto the fence post support. If you wish to alter the height of the fence post, you can trim it down prior to this stage.

Installing the Fence Panels

Once the posts are in place, prepare the panel cap by inserting the narrow part of the panel cap clip into one side of the panel cap, and the other into the opposite side. With the panel cap attached, slide the panel cap clips down the grooves in the opposing fence posts.

With these in place, you can start to add the fence panels. Slide the initial fence panel down the post groves so that it sits over the panel cap. Once the bottom fence panel in secure, slide the next panel down the post grooves onto the previous fence panel. Repeat this for the remaining slats until the required fence height is reached. There are 12 Hyperion fence slats for a standard 1.8m (6ft) fence height.

Finish off the fence panel by adding cap clips to both sides of a panel cap, attaching it to the top of the fence posts with the groove side down. Insert the fence post caps into the top of the fence posts.

Repeat these steps until the entire fence is complete, and finish by sliding post inserts into any open grooves for a sleek finish. Depending on your foundations, this set of instructions may change. In such cases please feel free to take a look at our comprehensive installation guide. For guidance on how to install Hyperion fencing on a gradient or at an angle, consult page 12 of our fencing installation guide.

You can order free Hyperion fencing samples here or browse the complete Hyperion fencing range here.

Please do feel free to get in touch with any questions; we are happy to discuss your particular project requirements in further detail.