A fascia board is the vertical board at the end of a roof that covers and finishes the exposed ends of the roof joists or rafters. The fascia board forms the visible edge of the roof and serves as the mounting point for the gutter. It protects the structure against weather and wind and gives the building a neat finish.
Where is the fascia board located?
The fascia board is found in three possible locations:
1. Along the gutter (underside) — The most visible fascia board. The gutter brackets are mounted here.
2. Along the side walls (barge board) — The board on the side of the roof where the roof surface meets the gable. Technically called a barge board, but in practice also referred to as a “fascia board”.
3. At the top — In some structures, there is a fascia board above the gutter, where the roof transitions into the fascia.
Materials
| Material | Maintenance | Lifespan | Price |
|---|---|---|---|
| Spruce (painted) | Paint every 5-7 years | 15-25 years | Low |
| Hardwood | Oil or paint | 25-40 years | Medium |
| Plastic (PVC or aluminium) | None | 30-50 years | Medium-high |
| Fibre cement | Paint | 20-30 years | Medium |
| EPDM-wrapped | None | 30-40 years | Medium |
For DIY projects, spruce (cheap, easy to work with) or plastic (maintenance-free) are popular choices.
Dimensions
| Application | Width (indication) | Thickness |
|---|---|---|
| Garden building / shed | 150-200 mm | 18-22 mm |
| Garage | 200-250 mm | 18-22 mm |
| House | 200-300 mm | 18-25 mm |
The width depends on the height of the roof edge — the fascia board must cover the full exposed end of the structure.
Fitting a fascia board
1. Cut to size — Measure the length and cut the fascia board to size. At corners: mitre cut at 45 degrees.
2. Fix — Stainless steel screws or nails into the exposed ends of the rafters or joists
3. Seal joints — Caulk the joints between fascia boards (timber moves)
4. Finish — Paint, oil or stain (for timber). At least 2 coats of primer + 2 top coats.
5. Hang the gutter — The gutter brackets are screwed to the fascia board
Fascia board on a flat roof
On a flat roof, the fascia board has an additional function: the EPDM or bitumen is folded over the roof edge and bonded or clamped to the fascia board. The fascia board thus forms the watertight connection between roof and facade.
The top of the fascia board receives a drip edge (aluminium or zinc profile) that directs water away from the fascia board.
Common mistakes
- Fitting the fascia board untreated — Untreated timber absorbs moisture immediately and rots quickly. Treat all sides (including the back) before installation.
- No drip edge on a flat roof — Water runs behind the fascia board and causes rot.
- Screws too thin — The fascia board must be firmly fixed; the gutter pulls on it. Use at least 4.5 mm stainless steel screws.
Related terms
- Gutter
- Overhang
- Rafter
- EPDM
- Flat roof