What is a verge weather board?

A verge weather board (Dutch: waterbord) is a board that covers the joint between the bargeboard and the adjoining row of roof tiles to keep out driving rain. It is found along the sloping gable edge of tiled roofs with timber bargeboards. The board is often fitted with a slight fall towards the roof, so rainwater runs off over the tiles instead of behind the bargeboard.

Why is it needed?

On a tiled roof with timber bargeboards, an open junction remains between the top of the bargeboard and the last tile. Wind easily drives rain under the tiles or behind the bargeboard, leading to wet battens, wet rot and damp on the gable wall. The weather board closes that gap and sheds the water onto the tiles.

Detailing

• The board sits on or against the bargeboard and overlaps the first row of tiles.
• The slight fall towards the roof stops water from standing on the board.
• Use durable or well-treated timber and paint all faces, including the end grain.
• Fix with stainless or galvanised screws or nails.

Alternatives

Many modern roofs use verge tiles that wrap over the roof edge, or a zinc or plastic verge trim. On older tiled roofs with timber bargeboards, a weather board is still a simple and effective fix.

Maintenance tips

1. Inspect yearly for cracks, open joints and flaking paint, especially at the end grain.
2. Remove moss and debris between board and tiles, as they hold moisture.
3. If the bargeboard rots, the weather board is often the cause or the first victim; replace both together.

Related terms

• Verge tile
• Verge tile finishing batten
• Roof tile
• Eaves
• Fascia board

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