04 Oct 2026
Fencing 86 Trim: fitting composite boards to concrete posts
This guide is about
Fencing 86 Trim - 180cm (1 Pack / 4pcs)
Concrete posts are the most annoying thing in a garden to replace and the easiest thing to keep. If the posts are sound and only the panels have gone, Fencing 86 Trim - 180cm (1 Pack / 4pcs) is the part of the fencing range that lets composite boards go in where the old panels came out.
What the listing states
- 4 x 180 x 4cm per piece.
- Four pieces per pack.
- Listed for standard 40mm concrete post installations, and described as compatible with 40mm post widths.
- Cut to length as needed, to trim the top and bottom edges of fence panels.
- Described as concealing raw panel edges.
- Finish chosen on the product page from five options.
- Supplier code AWS-TM86A.
The packaging line on the listing reads as zeroes, so there is no stated carton size or weight for this one. The pieces are 180cm long, which is the figure to think about for transport.
Matching the finish to the boards
The five finish options follow the same letters as the boards, which makes the pairing straightforward.
| Trim finish | Board it follows |
|---|---|
| A, Oak 03 | Fencing 86A - Oak 03 |
| B, Grey | Fencing 86B - Grey |
| D, Dark Brown | Fencing 86D - Dark Brown |
| E, Black | Fencing 86E - Black |
| F, Khaki | Fencing 86F - Khaki |
Choose the finish on the product page before adding the pack to the basket, because the trim is the piece that shows at the top and bottom of every bay. If you want the trim to read as a frame instead, Fencing 94 Trim - Black - 180cm (1 Pack / 4pcs) is listed in black outright and is the other trim the board listings name.
How it works with the boards
The boards in this range are 15 x 180 x 2cm, six to a pack, two packs to a full bay of twelve boards at 180cm high. They interlock with each other, so the trim is there for the edges rather than for the joints: the top edge, the bottom edge, and the raw ends where the stack meets the post.
Two things the listing does not tell you, and both change the order. It does not state how many pieces a bay needs, only that there are four in a pack, so ask the shop to work it out against your bay count and whether both faces of the fence need trimming. And it does not say whether screws or fixings come with the pack. Settle both before you order, with your post spacing written down.
Measuring old concrete posts
- Measure the slot width in the post. The trim is listed for 40mm, so anything else needs a conversation first.
- Measure the clear distance between posts, and the depth of the slot at each side.
- Measure the slot height, which sets how many 15cm boards will fit.
- Check the posts are plumb and the slots are not spalled at the edges before buying anything to put in them.
The trim is cut to length as needed, so a run of posts at slightly different spacings is workable, but the board length is fixed at 180cm and the listing does not say the boards themselves can be cut. That is the single most important question to ask if your old posts sit at anything other than standard centres.
Delivery is free within 50 miles of the Glasgow store and £50 beyond. When the slot width and spacings are measured, Fencing 86 Trim - 180cm is the part to confirm first, because it decides whether the existing posts can stay.