One of the less obvious drainage problems we see on older roofs in Montpelier is water tracking behind the gutter rather than falling neatly into it as intended. This happens when water runs down the roof slope, reaches the eaves, and finds a path behind the back edge of the gutter instead of over the front lip into the channel itself, often as a result of a slightly misaligned fascia board, a gutter fixed too far forward, or a small gap that has gradually opened up over years of weathering and minor settlement.
Because it happens out of sight, behind the gutter rather than in front of it where anyone would notice, this problem can go unnoticed for a long time, with the first real evidence being damp staining or discoloration on the wall below, which is particularly unwelcome on Montpelier's colourfully painted Georgian and Victorian frontages that so many residents take real pride in. By the time staining is visible from the pavement, water has often been finding its way behind the gutter for months or even years without anyone realising what was actually causing it, and by then the render or paintwork itself may already need attention as well as the roof.
Preventing this comes down to getting the relationship between the fascia, the gutter and the tile overhang correct, so there is no gap for water to slip through at the back of the gutter run in the first place, however small. On a new roof installation, this is set out properly from the start, with fascia boards, gutter brackets and the eaves course of tiles all aligned so that water has a clear, direct route into the gutter and nowhere else it can realistically go, whatever the weather brings, including during the driving, wind-blown rain that steep local streets often see.
For a re-roof on an older Montpelier property, this is one of the details genuinely worth asking about directly, since it is entirely possible for a gutter to have been refitted in roughly the right place at some point in the past without the fascia and eaves detail ever being checked properly against it, leaving the underlying cause of the tracking unresolved despite the gutter itself looking perfectly new and well fitted from the ground.
Because the cause sits behind the gutter rather than within it, simply cleaning or replacing the gutter itself will not solve tracking on its own, which is why it is worth having the wider eaves detail looked at properly rather than assuming a new length of guttering will automatically fix a problem that is actually happening just behind it.
If you have noticed staining on walls below your gutters, particularly on a painted or rendered frontage where it tends to show clearly against the colour, Brunel Roofing Bristol can inspect the eaves detail and advise honestly whether a new roof installation would resolve the underlying cause rather than simply masking the symptom for a season or two.
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