The short answer
A bargeboard is the board fixed along the rake of a gable, covering the roof timbers' ends and finishing the verge. Replacement is needed when the board has rotted, split or pulled away. The new board can be timber or uPVC, and it must be fixed to sound timber with the verge tiles and any dry-fix system refitted to suit.
What a bargeboard does
A gable is the end wall of a pitched roof, shaped like a triangle where the slopes stop. Along its slope the roof timbers stick out a little past the wall, and the bargeboard, sometimes called a verge board, is fixed to their ends. It hides them, gives a neat finish and helps keep wind-driven rain from entering the edge of the roof.
Beside the board, the roof's edge is finished with a verge: the line of tiles or slates that overhang slightly, bedded in mortar or clipped by a dry-fix system. The bargeboard and verge work together. The board covers the timbers below the overhang, and the verge sheds water clear of it.
A fascia does a similar job along the eaves, at the foot of the slope, and carries the gutter. A bargeboard is on the gable side, at the sloping edge, and does not carry a gutter. The two are often painted or clad to match and replaced together.
Boards are exposed. They sit at the edge of the roof, catching rain from above and from the side, and sun from the south and west. Timber ones rot where water collects at the base or soaks in at the ends, and paint fails at the joints.
Where a bargeboard rots, the roof timbers behind it, called the rafter ends or the ladder frame, are at risk of the same damp.
Why they fail
Most failures start with moisture. Paint on timber cracks and lets water in, particularly at joints and end grain. Once the wood is wet, fungi take hold and the board softens, splits or crumbles.
Poor detailing speeds this up. If the verge tiles overhang too little, rain runs onto the board face. If there is no protection to the top edge, water sits on it. A missing or failed verge seal lets water blow behind the board.
uPVC bargeboards fail differently. They do not rot, but they can warp, crack or fade, and fixings can work loose in wind, leaving the board bowed or hanging. Poorly fitted cladding over rotten timber hides the problem until the plastic comes away.
Wind is a cause too. A board that is not firmly fixed, or whose fixings have corroded, can flap and pull away, and a loose board can be torn off in a gale.
Signs to look for from the ground include peeling paint, dark or soft patches, gaps at joints, boards that bow away from the wall, and daylight or birds' nests behind them. A loose board is also a safety risk, since it can fall.
Our page on capping against replacing fascias covers the equivalent choice for eaves boards.
Timber or uPVC, and the verge beneath
Timber is the traditional material and suits older and period houses. It can be shaped to match ornate profiles and repainted, but it needs maintenance and decays if neglected. uPVC is low-maintenance, available in standard profiles and does not rot, though it cannot be moulded to a one-off pattern and its colour range is narrower.
Do not clad over a bad board. Capping a rotten bargeboard with plastic traps damp against decaying timber, and hides the damage. The sound approach is to remove the old board, inspect the rafter ends behind it, cut out and repair any rot, then fit the new board to solid timber.
The verge needs attention at the same time. If the verge is bedded in mortar, the joint may have cracked and need re-bedding. If it is held by a dry-fix system, the verge units are refitted with the right clips. Marley says mortar alone should not be relied on now, and BS 8612 is the test for dry-fix verge, hip and ridge fittings. MyJobQuote gives dry verge installation as usually falling between £500 and £2,000 (MyJobQuote, Oct 2026).
Our page on dry verge installation covers those systems. For a listed house, or one inside a conservation area, the board's material and profile may be controlled, so ask the council first.
How the work is done
Access is usually the main factor, since a gable edge is high and the boards run up the slope. A tower or scaffold is common, and a frame over the road or pavement needs the authority's licence, while one that stays within your boundary does not.
The old board is removed carefully, so the timbers behind are not damaged further. Decayed sections are cut away and new treated timber is fitted, and the rafter ends are checked and, if needed, spliced. The new board is cut to length and fixed with corrosion-resistant fixings, then primed and painted if it is timber, or fitted with its joints and trims if it is uPVC.
The verge is checked, re-bedded or refitted. Gaps are sealed, and the junction with the fascia at the eaves is finished so water cannot track behind.
On the survey we photograph the boards and the timbers behind, test for softness and measure the run. You see the evidence, and we recommend repair where a section is sound and replacement where it is not. The figure is a single written total, with scaffold stated.
The gutters, soffits and fascias hub covers the roofline as a whole, and doing the work together can share the access cost.
