Help with cause of fascia rot?

Hi There, You could possibly be getting water in and without eaves protection over your fascia, this would allow the water ingress to make its way into your property.

Most likely your felt has eroded at the eaves allowing wind driven rain to get blown in under the tiles/and rain getting under your tiles dripping into the loft, Replace the first mtr of underfelt & install felt support trays at the eaves vented ones would be better. Good luck Alex

Hi there If it’s a newish roof then if the breathable membrane is into the gutter it will soak upwards as there should be eaves trays or the first half metre to metre should be felt or dpc which doesn’t absorb water. The end of the gutter stop end could be defective also. And may need to be re-aligned if gutters are with metal straps.

Hi. Its a common place to get leaks. If your verge has failed it runs into the bottom corner. This will cause it to rot. It could be over years. A full replacement will be needed and get them to look at the verge. Also check all the gutters are clear and flowing

The felt has perished and dropped down behind the fascia. The rotten wood should be cut out and replaced, the fist section of felt replaced with an underlap then felt support/eaves protector fitted. It is also wise to fit a support inder the eaves protector say 6mm ply as in extreme heat the eaves protector can soften and warp and fall ineards with extreme heat

From what you’ve described, it sounds like the fascia and soffit rot are more likely to be a symptom rather than the root cause. The fact you’re getting water into the loft and a drip from the gable end suggests water is getting behind the fascia somehow. The most common causes I come across are: • Leaking or overflowing gutter joints/end caps. • Missing or damaged eaves support trays allowing water behind the fascia. • A deteriorated or torn roofing underlay directing water into the fascia instead of the gutter. • Failed verge or gable-end detailing allowing rain to track behind the soffit. • Condensation from poor loft ventilation (less common if you’re also seeing external drips). Before replacing any timber, I’d recommend finding the source of the water ingress first. Otherwise, the new fascia and soffit will eventually suffer the same fate. A few photos of the outside (gutter, roof edge and gable), plus one from inside the loft above the affected area, would help narrow it down considerably.

Your Guttering may have hir line cracks

This is a very common issue! The cause of the damp into the soffit board/fascia is usually down to the felt degrading and sagging behind the fascia board! At the very least the first few courses need removing and a new section of felt needs to be installed ontop of felt support trays to eliminate the same problem in the future

From what you’ve described, I’d be looking closely at the gutter end/stop end and the joint above the affected soffit. Even a small, intermittent drip can allow water to get behind the fascia and soffit over time and cause rot. I’d also check the gutter fall, whether the gutter is overflowing during heavier rain, and the roofline/underfelt above the area. A small amount of water in the loft suggests it’s worth tracing the water back to its entry point rather than assuming the rot itself is the cause.