7 Common Roofing Problems and How to Prevent Them

The same seven problems, on almost every roof

After enough inspections the variety disappears. Different houses, different ages, different materials — and the findings are drawn from a list that barely changes, which is good news, because a short list is a list you can check yourself.

Every one of them is cheap to fix early and expensive to fix late. That gap is the entire argument for looking at your roof twice a year.

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Flashing, boots and valleys — the first three

Failed flashing is the leading cause of leaks we attend, and it is almost always the step and counter flashing where the roof meets a wall or chimney. Sealant was used where metal should have been, and sealant has a life measured in seasons.

Pipe boots come second: the rubber collar around a vent stack cracks from UV long before the shingles wear out, and it is a twenty-minute repair that people discover as a ceiling stain. Valleys come third, holding debris until the water has nowhere to go but sideways.

The other four, in order of how often we find them

None of these announce themselves. All of them are visible to someone who knows to look.

• Lifted or missing shingles along ridges and windward edges after storms
• Blocked or sagging gutters pushing water back under the bottom courses
• Poor attic ventilation cooking the deck from underneath
• Previous repairs done in mastic, hiding whatever actually failed

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Why the stain is never above the leak

Water enters at a failure point, travels along the underside of the deck or down a rafter, and drops wherever gravity finally wins. We have traced entry points three metres uphill of the mark on the ceiling more times than we can count.

Anyone who quotes a repair based on where the stain is, without going into the attic, is guessing with your money.

That is the practical test for a contractor. The inspection should start on the roof and finish in the attic, and you should be shown photographs of both.

Prevention is mostly just looking

Twice a year from the ground, once a year in the gutters, and a professional inspection every three to five years or after any serious storm. That is the whole programme, and it costs a fraction of one avoidable repair.

Keep the reports. A documented history of your roof is worth real money if you ever need to argue a storm claim, and it is worth something at sale too.