Living near the Boyd and its watermeadows
A roof close to wet ground has to shed water well and dry out afterwards.
A river does not soak a roof, but it changes the air around it. In a valley with a watercourse running through the village and open meadows beside it, ground and air stay moist, and mist and dew settle on the roof as well as rain. A pitched roof copes with this if its covering is sound, its underlay is intact and its loft can breathe. A roof that has been neglected shows the damp early.
The first sign is usually green. Moss and algae colonise a roof that stays wet, starting on the shaded side and the lowest courses. A thin film is only cosmetic. A deep cushion is another matter: it keeps the surface wet and works into the overlaps between tiles. We lift a corner of the moss to see what is beneath: a clean, intact tile means a clean will do the job, while a pitted or flaking surface means the roof is wearing out faster than it should.
The second sign is inside. Condensation in a loft looks like a leak and is often mistaken for one. Moisture-laden air drifts up from the rooms below, meets cold timber and condenses, and the drips soak the insulation and mark the ceiling. The cure is ventilation and sealing the ceiling below the loft, not a new covering. Our guide to loft condensation explains how to tell the two apart.
The third is the underlay. Where felt has gone brittle or sagged, a drop that slips past a tile can only land on the timber. We check it at the eaves, where it should run into the gutter, and from the loft, where daylight or dark staining shows the weak spots.
Dealing with damp early is cheaper than dealing with its effects later. Our roof inspections are designed for exactly that: an honest survey with pictures, before a small fault becomes a big one.
Myth
A stained loft ceiling always means the roof covering is leaking.
Fact
Warm, moist air condensing on cold timber produces the same stain, which is why we look at ventilation before we look at the tiles.



