Tiles on a Roof: What I Check, Fix and Warn You About Before It Gets Expensive

What I Really Look At When I See Tiles on a Roof

When customers ask me about the tiles on their roof, they usually point at one broken tile and ask, “Is that serious?” In my 18 years on the roof, I’ve learnt that the single broken tile is rarely the full story. The pattern of damage, the way the tiles sit, and how the roof has been detailed at the edges often tells me far more than the obvious crack you can see from the ground.

In this article I’m not going to drown you in textbook types of tiles. Instead, I want to show you how I actually assess a tiled roof in Sussex, what usually goes wrong, and how to decide between a small repair and a bigger job – before things get unnecessarily expensive.

First Things First: Are Your Tiles Really the Problem?

When I turn up to a property, people understandably focus on the tiles because they’re visible. But tiles are only the skin of your roof. Underneath, you’ve got:

Battens (the horizontal timber strips the tiles hook onto)
Breathable felt or membrane (your secondary waterproof layer)
Fixings (nails or clips keeping everything in place)

Here is my honest advice: a roof with a couple of cracked tiles but sound battens and felt is usually a quick, tidy fix. A roof with lots of slipped tiles, sagging lines and soft timbers underneath is a different conversation.

If you’re worried about the condition of what sits under your tiles, I offer full batten and felt replacement when it’s genuinely needed – not just because it sounds like a big job.

How I Quickly Rate the Health of a Tiled Roof

From the street and on the ladder, I mentally give every tiled roof a quick score. You can do a simpler version yourself from the ground:

Tile lines: are the rows straight, or do they wiggle and dip?
Colour patches: are there obvious “new vs old” patches suggesting lots of past repairs?
Edges and ridge: any missing, loose or leaning ridge tiles or verge tiles?
Moss build-up: is it light, or is it thick enough to hold water and lift tiles?
Random gaps: can you see any dark lines where a tile has slipped?

If you look up and any of that doesn’t feel right, it’s usually worth getting me to have a closer look before another winter sets in. I offer a free roof inspection in Brighton and across Sussex, where I’ll photograph what I see and explain it in plain English.

Common Tile Problems I See All the Time in Sussex

1. Slipped or Missing Tiles

Slipped tiles are often the first visible sign you’ll notice. The usual causes are:

Old, rusted nail fixings
Rotten or undersized battens
Wind uplift getting under the tile edges
Heavy moss gradually prising tiles upwards

If you ask me, I’ll tell you straight: one or two slipped tiles can often be refixed or replaced quite cheaply. But if I find whole rows that are loose, that points to wider fixing or batten failure. At that point, “just putting them back” is a sticking plaster, not a repair.

2. Cracked and Spalled Tiles

Clay and concrete tiles can suffer from hairline cracks, frost damage or “spalling” (where the surface pits and flakes away). In my experience, the worst damage usually shows:

Along the lower edges where water sits longer
On the south and west faces baked by sun and hit by storms
Around roof windows, chimneys and valleys

One isolated cracked tile doesn’t mean the whole roof is finished. A scattering across the whole slope on a roof that’s already 50+ years old usually tells me we should start talking about longer-term plans rather than constant call-outs.

3. Ridge and Verge Tiles Working Loose

The tiles along the top (ridge) and down the sides (verge) take more wind than the rest of your roof. On older roofs they were often set in mortar only. Over time that mortar cracks and washes out, which is why you see ridge tiles leaning or missing after a storm.

These areas are also where water can drive in and track under tiles, causing hidden leaks. I always inspect ridges and verges carefully, especially after bad weather.

4. Leaks That Aren’t Directly Under the Broken Tile

This is the one that confuses most homeowners. You see a stain on a bedroom ceiling and assume the problem is right above it. Often it isn’t. Water can come in through a small fault higher up, run along felt, rafters or even down a nail, then finally show up several feet away.

That’s why tile repairs should never be guesswork from a ladder. If you’ve already got water coming in, use my urgent leak repair booking service so I can track the leak properly, stop it at the source and document what I find.

Tiles Around Chimneys, Walls and Valleys – The Usual Leak Traps

If you ask me where tiled roofs most often leak, I won’t say “the middle of the roof”. It’s almost always where tiles meet something else:

Chimneys – weak or cracked lead flashing, missing soakers, poor mortar fillets
Party walls and parapets – failed flashings or felt cappings, bad detailing
Valleys – blocked valley gutters, badly cut tiles, rotted valley boards
Abutments – where a tiled roof hits a wall or a flat roof

I repair and replace a lot of lead flashing in Brighton and Worthing for exactly this reason. The tiles themselves can be fine, but if the join between the tiles and brickwork is poor, you’ll still get damp.

If you’ve got a party wall or parapet running along your roof and damp is showing on the inside face, I may also recommend felt capping on the firewall or parapet to stop water soaking through and ending up in your bedroom instead of outside where it belongs.

How I Decide Between a Tiled Roof Repair and a Full Replacement

People often ask me, “Be honest, is it worth me repairing this, or should I bite the bullet and redo the whole thing?” Here’s how I weigh it up, and you’re welcome to use the same logic.

Good Candidate for a Simple Tile Repair

I normally recommend a repair when:

The roof is generally straight and even
The majority of tiles are still sound with only localised damage
Battens feel solid and dry when I lift a few tiles
The felt or membrane is aged but not crumbling or full of holes
The property and roof aren’t already at the end of their expected life

In that case, replacing broken tiles, refixing loose ones and sorting problematic flashings is usually the most sensible and cost-effective solution.

When I Start Talking About a Bigger Job

A full re-roof or at least stripping back to install new battens and felt becomes sensible when:

Large sections of tiles are loose or slipping regularly
Battens crumble, split or feel spongy once exposed
The old felt tears like paper and disintegrates in my hands
You’re getting repeat leaks in different areas of the roof
The tiles are near or past their typical lifespan

On terraced houses I carry out complete pitched roof replacements in Brighton where we strip everything, renew the structure underneath and relay tiles properly. I don’t push for this unless I honestly think it will save you money and hassle over the next 20+ years compared with constant patching.

How Gutters and Fascias Affect the Life of Your Roof Tiles

Tiles don’t work in isolation. If the water has nowhere to go, it backs up under them. Problems I often see include:

Blocked or undersized gutters causing water to splash back onto the lower row of tiles
Rotten fascias letting the gutter brackets move and tilt, so water runs the wrong way
No drip edge so water tracks back under the tiles instead of into the gutter

When I’m working on a tiled roof, I always check the guttering and fascia boards, because there’s no point fixing the tiles if water is going to be constantly hammering the wrong places afterwards. If yours are failing, I can also quote to renew the uPVC fascia boards and guttering and downpipes at the same time, so everything works together properly.

My Process When You Ask Me to Look at Your Tiled Roof

If you’re in Brighton, Hove, Worthing or nearby and you contact me about the tiles on your roof, here’s exactly what I do:

1. Quick chat and photos – I’ll ask what you’ve noticed and if you can safely send me any photos from the ground.
2. Free site inspection – I come out, get a proper look from the ladder, lift selected tiles and check the battens, felt and fixings, plus key details like chimneys and valleys.
3. Clear explanation – I show you photos, explain what I’ve found, and tell you straight if I think a repair is enough or if we should plan for something more substantial.
4. Fixed-price quote – if you want to go ahead, I give you a fixed quote so you know exactly what it’ll cost – no “plus VAT surprises” hidden in the small print.
5. Client portal updates – once we start, you can log into my online portal to see daily photo updates of your roof as I work on it, along with schedule, invoices and warranties.

When to Call Me In and What to Watch For

Here’s my honest, simple checklist. It’s time to get me in for a look if:

You can see slipped, missing or obviously broken tiles from the ground
You’ve spotted damp patches or brown stains on ceilings or upper walls
Ridge tiles or verge tiles look loose, out of line or heavily cracked
You’ve had repeated “small” leaks in different places over the last couple of years
Your roof is older than you are comfortable gambling on and you’re planning other big works like a loft conversion

I won’t try to sell you a new roof if you don’t need one. I’ll tell you exactly what I’d do if it was my own house, and I’ll back it up with photos so you can see what I’m seeing.

Final Thought: Tiles Are Only as Good as What’s Under Them

Tiles on a roof do a brilliant job when everything underneath and around them is properly detailed. Most of the expensive problems I see don’t start with the tile itself – they start with loose fixings, tired felt, weak battens, poor flashing or bad water management.

If you’re in Sussex and you’re unsure whether your tiled roof needs a quick bit of attention or a more serious look, ask me to come out, climb up and show you exactly what’s going on. You’ll get straight answers, fixed prices, and full visibility of the work from start to finish.