10 Signs Your Roof Needs Repair

A stain on a ceiling is very rarely caused by the plaster directly above it – water travels along the underside of roofing felt or a rafter before dripping, so the source might be a metre or more away. Look for a brownish-yellow ring that reappears or grows after heavy rain. Call a roofer straight away if the stain is fresh, growing, or damp to the touch.

South Wales gets its fair share of exposed, wind-driven weather, and tiles rarely fail without a reason – storm damage, repeated wind buffeting, age, or corroded fixings are the usual causes. A single missing tile is a same-day repair; several missing or slipped tiles suggests the fixings generally are on their way out.

Ridge tiles are bedded into mortar that seals the join between two slopes, and that mortar is the weak point – years of freeze-thaw cycles crack and eventually crumble it. You will often spot the early stage from the ground: mortar crumbs in the guttering, or an uneven ridge line. The permanent fix is a dry ridge system, mechanically clipped rather than mortared.

This is the one sign that should never wait. A dip, wave, or visibly sagging section means something structural has changed – rotten rafters, failed purlins, or timbers carrying too much weight for too long. We would always recommend a proper structural inspection rather than a quote over the phone if you notice this.

A light, even covering on a shaded north-facing slope is mostly cosmetic. Thick, cushion-like moss is different – it holds water against the tile long-term, accelerating frost damage and lifting tile edges to let wind-driven rain in behind. If moss is thick enough that you cannot easily see the tile surface beneath it, it is worth a proper look.

Gutters aren’t part of the roof covering, but they’re doing a roof’s job of moving water away from the building. A blocked gutter overflows during heavy rain and soaks fascia boards and the timbers just above them. Autumn leaf fall is the main local culprit, and a simple annual clear is one of the cheapest bits of roof maintenance there is.

Flashing is the metal, almost always lead, that seals the join wherever a roof meets a chimney, valley or skylight. Chimneys are the classic failure point, and roof valleys carry a huge amount of water concentrated into a narrow channel. Flashing problems are, in our experience, one of the most common causes of a mystery leak that other repairs have missed.

If you go into your loft during daylight and can see pinpricks or patches of light coming through, that’s a physical gap in your roof’s covering – and water can get in wherever light can get out. Turn the torch off first and let your eyes adjust; check on a dry day and note the location for a roofer to find from outside afterwards.

An unexplained increase in heating costs is rarely the first thing homeowners connect to their roof, but it’s often directly related. Physical gaps let draughts in directly, and – more commonly – a slow, unnoticed leak soaks loft insulation from above, which loses most of its thermal performance once wet.

Every roofing material has a realistic working life. Natural slate can last 80-100+ years; concrete tiles typically 40-60 years; clay tiles 50-60 years or more; flat roofs vary most, from 10-15 years for traditional felt up to 25-40 years for EPDM rubber. If your roof covering is approaching the upper end of its lifespan, that is the point to start budgeting for a survey.