An inner fascia board is the fascia board on the inside of a roof gutter, finishing and protecting the roof construction on the interior side. It is the board that sits between the gutter and the building, covering the ends of the rafters or roof beams and providing a clean, weather-resistant finish at the eaves.
Purpose and placement
At the edge of a roof, where the rafters extend beyond the wall, several finishing elements come together. The inner fascia board is mounted on the interior side of the gutter — the side facing the building. Its counterpart, the outer fascia board, is mounted on the exterior side of the gutter, facing outward.
The inner fascia board serves multiple purposes:
- Protection — It shields the end grain of rafters and the roof construction from moisture, preventing rot and decay.
- Aesthetic finish — It creates a neat, continuous line along the eaves, hiding the rough structural timber behind it.
- Gutter support — Together with the outer fascia board, it forms the channel or mounting surface for the roof gutter.
- Pest barrier — It closes off the gap between the roof and the wall, preventing birds, insects and rodents from entering the roof space.
Materials and maintenance
Inner fascia boards are traditionally made from softwood timber such as pine or spruce, treated with paint or stain to resist moisture. In modern construction, materials like fibre cement, PVC or aluminium are increasingly popular because they require less maintenance and have a longer lifespan.
Timber fascia boards should be inspected regularly for signs of rot, especially at joints and where they meet the gutter. Repainting every few years extends their service life. When replacing a damaged inner fascia board, it is important to check the underlying rafter ends for decay as well, since moisture that damages the fascia board often affects the structure behind it.
Related terms
- Fascia board
- Gutter
- Roof
- Eaves
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