Most people only think about their roof when something has already gone wrong. By that point the water has usually been getting in for a while, and what could have been a straightforward repair has turned into something bigger.
The good news is that roofs give you warning signs long before they fail properly. Here is what actually matters, and what does not.
1. Damp patches on upstairs ceilings
This is the obvious one, but it is worth saying that the stain is rarely underneath the hole. Water gets in at one point, runs along a rafter or a felt lap, and drops somewhere else entirely.
That is why poking around in the loft directly above the damp patch often finds nothing. It also means that if you have a stain, the actual entry point could be several feet away in any direction, which is why it is worth having someone look at the roof itself rather than guessing from inside.
2. Mortar dropping into the gutters
Have a look in your gutters. If you are finding lumps of sandy grey mortar in there, that is coming off the ridge or the chimney flaunching.
Mortar bedding does not last forever. Once it starts breaking down, the ridge tiles it was holding are only being held by their own weight, and a decent gale can shift them. Catching this while it is just crumbling mortar is a lot cheaper than catching it after a ridge tile has come off.
3. Daylight through the roof from inside the loft
Go up into the loft on a bright day and turn the light off. You should not be able to see daylight coming through the roof covering.
If you can, water can get in the same way. Small pinholes of light around a chimney or at a valley are worth taking seriously even if you have not seen a leak yet, because it usually means a flashing has lifted or split.
4. Moss holding water on the tiles
A bit of moss on a north-facing slope is normal in Cheshire and not on its own a reason to panic. What matters is how much, and whether it is holding water.
Thick moss acts like a sponge. It keeps the tiles wet long after the rain has stopped, and in a hard frost that water expands and works away at the tile surface. It also breaks off, washes into the gutters and blocks them, which sends water down your wall instead of down the drain. If your gutters keep filling with green debris, the roof is the cause, and a roof clean and moss treatment is usually the fix.
5. Sagging along the ridge or between rafters
Stand across the road and look at the ridge line. It should be straight. A visible dip or a wave in it means something structural has moved, and that is the one on this list that genuinely should not wait.
Same goes for a roof slope that looks bowed or uneven between the rafters. That is not a covering problem, it is what is underneath.
Two things that look worse than they are
Discoloured or streaky tiles. Tiles weather. A twenty-year-old roof does not look like a new one and that is fine. Colour variation, lichen spotting and general dullness are cosmetic. If the tiles are sound and sitting flat, a tired-looking roof is not a failing roof. It might be worth a clean, but it does not need replacing.
One slipped tile. A single tile that has worked its way out of position is a genuinely small job. It does not mean the roof is going. Some roofers will use it as the opening line in a conversation about a full re-roof, and most of the time that is not warranted. Get it put back, and get the rest of the roof looked at at the same time so you know where you stand.
What to do about it
If you have spotted one or two things off this list, it is worth getting eyes on the roof properly rather than guessing from the ground. A drone inspection will show you the whole roof in high resolution without anyone needing to put up scaffolding first, and you get the photographs, so you can see for yourself what is going on up there.
If it turns out to be nothing, that is a perfectly good answer, and we will tell you so. If it does need work, at least you are making the decision with the evidence in front of you.
Get in touch if you would like us to take a look.
Ready for a free, no-obligation quote?
Tell us about your roof and we'll get back to you quickly with honest advice and a competitive price. No pressure, no jargon.