Fascia boards rot where water sits against bare or tired timber. Here are the usual causes on Ridgeway's inter-war and post-war houses, and what to do about them.
The fascia is the board along the roof edge that carries the gutter, and on many Ridgeway houses it is still timber. Rot rarely starts without water, and the water almost always comes from the gutter or the roof edge. Understanding the cause matters more than just replacing the board.
Water from the gutter
A leaking joint, a blocked outlet or an overflowing gutter keeps the top edge of the fascia wet. Water also runs down behind the gutter and into the back of the board. The result is rot that starts where nobody looks and spreads along the board.
Garage and extension fascias are not exempt. Where a flat roof drains into a gutter fixed to a timber board, the board sits right beside a lot of water. If the roof edge trim is poor or the gutter is the wrong fall, the fascia gets a steady soaking that eventually shows up as soft, dark timber.
Failing paint and open joints
Paint protects timber only while it is intact. Once it cracks, flakes or peels, water goes in and the board stays damp. Open joints between boards and cut ends let moisture soak in endwise. Repainting over damp wood only traps it, so rot continues underneath.
- Flaking or bubbling paint along the lower edge
- Open joints where two boards meet
- Cut ends left bare to the weather
- Gutter brackets fixed into soft timber
The roof edge itself
On a hipped roof the eaves run all the way round, so there is a lot of fascia exposed to weather. If the felt at the eaves does not lap into the gutter, or tiles overhang too little, rain can run behind the board. Damp rafter ends can also pass moisture into the fascia.
Poor airflow and condensation
If the roof space does not breathe, moisture can build up and sit against the timber at the eaves. Blocked soffit vents or insulation pushed into the eaves make it worse. A board that is constantly slightly damp will rot, even without an obvious leak. Over time, this kind of damp can reach the soffit and the ends of the rafters too.
Putting it right
We check the gutter and roof edge to find why the board is wet, then replace rotten fascias and any soffits that are affected. Rafter ends are looked at before new boards go on. UPVC is a very low maintenance choice, and new gutters are fitted so the water leaves cleanly this time.
We also tell you what to watch for after the work. Gutters should be kept clear, and any sign of overflow is worth a call. UPVC will not rot, but a blocked gutter can still push water behind it, and a quick look from the ground each autumn is a sensible habit.
Frequently Asked Questions
Can a rotten fascia be repaired rather than replaced?
Small patches of damage can sometimes be cut out and filled, but where rot has spread along the board, replacement is better. A repaired board that is still damp behind will fail again. We assess how far it goes.
How can I tell if fascia is rotten?
From the ground, look for peeling paint, dark staining, soft or crumbling edges and a gutter that sags or has pulled away. Those signs are worth a call. Please do not probe the board from a ladder.
Does rot spread to the roof?
It can. If water gets past the fascia, it can reach rafter ends and the eaves, which are harder to repair. That is why we check them whenever a fascia is replaced, and why early action is worth it.
Talk to our team about UPVC fascias and soffits in Ridgeway
Every roof is different — the fastest way to get an accurate answer is a quick chat with our team.