Timber Fence Capping 75×25mm: What It Is and Why You Need It

If you've ever seen a timber paling fence with split, rotting tops — that's what happens without capping. Fence capping is the horizontal timber that runs along the top of a paling fence, covering the end grain of every paling and protecting it from direct rain exposure. At Wallan Fencing and Timber Supply, we stock treated pine fence capping in 75×25mm, the standard size for residential paling fences across Victoria.

Why End Grain Is the Enemy

Timber absorbs water primarily through its end grain — the cut ends at the top and bottom of each paling. Without protection, rain sits on those exposed ends, soaks in, and accelerates rot. In the Wallan and Mitchell Shire climate, where summer storms can be intense and winters are cold and wet, unprotected paling tops can start to deteriorate within a few years.

Capping solves this by covering the end grain entirely. It also gives the fence a clean, finished appearance — a capped fence looks noticeably more professional than an uncapped one.

About the 75×25mm Capping

Our treated pine fence capping is:

• Dimensions: 75mm wide × 25mm thick
• Length: 4.2m or 5.4m (check current stock)
• Treatment: CCA pressure-treated, H3 rating — suitable for above-ground exterior use
• Finish: Sawn, green-grey treated colour

The 75mm width is designed to overhang the palings slightly on each side, directing water away from the paling faces. The 25mm thickness gives it enough rigidity to span between posts without sagging.

How Much Capping Do You Need?

Capping runs the full length of the fence at the top, so:

Metres of capping needed = Total fence length

If your fence is 30m long, you need 30 linear metres of capping. Divide by the board length to get the number of pieces, and add 10% for waste and cuts.

Installation

1. Fix after palings are up. Capping goes on last, once all palings are nailed off.
2. Centre it over the palings. The capping should overhang equally on both sides — typically 10–15mm per side.
3. Nail or screw through the top. Use 65mm or 75mm galvanised nails, or 50mm galvanised screws. Fix at every paling or at least every 300mm.
4. Mitre or butt-join at corners. For a neat finish at corners and gate posts, mitre the capping at 45° rather than butting it.
5. Seal cut ends. If you cut the capping to length, apply end-grain sealer or timber preservative to the cut ends before fixing.

Capping vs No Capping: Is It Worth It?

In short — yes. The cost of capping is modest compared to the cost of replacing rotted palings in five years. It also improves the fence's appearance and can add to the perceived value of the property. For any new timber paling fence in Wallan, Kilmore, Broadford or the surrounding Mitchell Shire area, we always recommend including capping in the build.

Pairing with Other Timber Products

Capping works with any paling size — 100×12mm or 150×12mm — and complements the full range of treated pine fencing products we stock:

• Treated pine palings (100×12mm and 150×12mm)
• Fence rails (75×50mm)
• Fence plinths (150×25mm and 150×38mm)
• Fence posts (hardwood, cypress, or steel)

Available at Wallan Fencing and Timber Supply

We stock treated pine fence capping at our Wallan yard, with same-day pickup available. We supply homeowners, tradies, and builders across Mitchell Shire — including Kilmore, Broadford, Seymour, Beveridge, Craigieburn, and Donnybrook.

Call us on 0431 193 102 or get a quote online.