How to Tell If Your Shingles Need Replacing

Look for a cluster of ageing signs, especially if your roof is near or past its expected age. The main ones are widespread granule loss, indicated by coarse grit collecting in your gutters and bald, dark patches on the shingles; curling or cupping edges, where shingles have dried out and lifted; cracked, brittle shingles that have lost their flexibility; and missing shingles across the roof. A few isolated problems, like a handful of wind lost shingles on an otherwise sound roof, are repairs. But when these signs are widespread, the shingles have collectively lost their protection and their flexibility, and replacement is the honest call before leaks begin. The advantage of reading the signs early is that you replace on a planned schedule rather than scrambling after water comes through the ceiling, which is both cheaper and far less stressful.

It can be, depending on how much and what else you see. Granules are the protective mineral coating on asphalt shingles, and they shield the shingle from UV and weather. A small amount of grit in the gutters is normal, particularly on a newer roof shedding loose granules. But steady, increasing amounts, especially alongside bald dark patches appearing on the shingles themselves, mean the protective layer is wearing away and the roof is ageing in earnest. Once granule loss is widespread, the exposed shingle mat degrades faster in the sun, accelerating the decline. So grit in the gutters is an early warning to watch rather than an automatic replacement trigger, but combined with bald patches on an older roof, it is a strong sign the shingles are wearing out and it is time to assess how much life remains.

It depends on how widespread the curling is. Curling and cupping happen as shingles age and dry out, losing their flexibility and lifting at the edges or centre, which stops them shedding water cleanly and lets wind get underneath. If only a few shingles in one area are curling on an otherwise flat, sound roof, a targeted repair may address it. But curling is usually a sign of age affecting the whole roof, and when it is widespread across the slopes, it means the shingles as a batch have dried out and reached the end of their useful flexibility. At that point, replacing individual curled shingles just chases the problem across the roof, and full replacement is the honest, more economical call. We assess how widespread the curling is and whether the rest of the roof shares the same ageing, then advise accordingly.

It varies with the shingle quality and the roof's conditions, but our wet, shaded climate tends to be harder on shingles than a dry one, so reading the signs matters more than a fixed number. A budget three tab shingle has a shorter life than a quality architectural shingle, and a roof on a sunny, well ventilated slope outlasts one on a shaded, moss prone north face. Rather than rely on an age alone, it is more reliable to watch for the ageing signs, granule loss and gutter grit, curling, cracking, and missing shingles, which tell you the actual condition. That said, as a shingle roof approaches the upper end of its expected age, you should start reading those signs on the early side and planning ahead, because replacing on a schedule is cheaper and less stressful than reacting to the first leak. We can assess your roof and give you an honest estimate of remaining life.

The deciding factor is whether the problems are isolated or widespread. Isolated damage on an otherwise sound roof, a few wind lost shingles, a single failed area, is a repair, and a sensible one if the rest of the roof is healthy and has life left. But when the ageing signs are widespread, granule loss with gutter grit across the roof, curling and cracking on multiple slopes, many missing shingles, especially on a roof near or past its expected age, the shingles have collectively worn out, and repairs just chase failure from spot to spot. At that stage replacement is the honest, more economical choice, because the running cost of repeated repairs plus the leak risk exceeds the cost of replacing properly. A sagging roof line is a separate, more urgent sign that warrants prompt assessment for possible deck or structural issues. We inspect the whole roof and tell you straight which side of that line yours is on.