Tiles on a Roof: What I Check Before I Touch Anything

When customers ask me about the tiles on their roof, they usually point at one slipped tile and say, “Can you just pop that back?” If you ask me, I’ll tell you straight: a single loose tile is rarely the whole story. In my 18 years on the roof around Brighton, Hove and Worthing, I’ve learnt to look at the whole system, not just the tile you can see from the street.

In this article I’m going to walk you through how I look at roof tiles on a real job – what I check, what actually matters for water-tightness, and when it’s worth a quick fix versus when you’re better off planning proper work.

First Things First: Tiles Are Only the Skin, Not the Whole Roof

Most people think the tiles are the roof. In reality, they’re just the outer skin. Under those tiles you’ve got:

  • Breathable felt or old bituminous underlay
  • Battens (the horizontal timbers the tiles hook onto)
  • Rafters and insulation below

When I come out to look at loose or broken tiles, I’m really asking three questions:

  • Are the tiles themselves at the end of their life?
  • Is the felt and batten structure still sound?
  • Is water getting in where you can’t see it yet?

If I see widespread felt damage, rotten battens or daylight in the loft, I’ll often recommend a proper felt and batten replacement rather than endlessly patching tiles on a failing base.

Common Types of Tiles I See in Sussex – And How They Age

Across Brighton, Hove, Worthing and the surrounding villages I mainly come across four tile types. Each one fails in its own way.

1. Clay Plain Tiles

These are the small, traditional tiles you see on older Sussex houses. When customers ask me if they should keep them, my honest answer is: if the clay is good quality and the roof isn’t sagging, they can last 80–100 years or more.

Typical issues I see:

  • Snapped tiles at the nibs where they hang on the battens
  • Wear in the nail holes, so tiles start to slide
  • Frost damage – tiles spalling or flaking on exposed elevations

On older clay roofs, I often treat repairs a bit like dentistry: replace the worst “teeth”, keep the character, and only talk about full replacement when the underlying structure is failing.

2. Concrete Interlocking Tiles

These are the larger, heavier tiles you see on a lot of post-war properties and 80s–90s estates. They lock together along the sides and can give good weather protection when installed properly.

What I look out for:

  • Surface erosion – the sandy top layer wearing away, exposing the aggregate
  • Heavier loading on old rafters (concrete is much heavier than clay)
  • Poorly cut tiles at hips and valleys letting in wind-driven rain

If your concrete tiles are very “powdery” to the touch and you’re seeing granules in the gutters, that’s usually a sign they’re past their best and no amount of coating paint will fix the actual issue.

3. Slate Tiles (Natural and Fibre-Cement)

I see natural Welsh slate on older, higher-end properties, and fibre-cement slate on newer builds and extensions.

  • Natural slate – can last 100+ years if the nails and battens are decent.
  • Fibre-cement – generally shorter lifespan, and more prone to edge damage.

Most “slate tile” jobs I get called to are actually about nail failure – what roofers call “nail sickness” – rather than the slate itself wearing out.

4. Decorative & Shaped Tiles

On Victorian bays, gables and some terraces you’ll see decorative bands, scalloped tiles or different colours. These areas don’t just look pretty – they’re also common leak points because of all the extra cuts and overlaps.

When I work on these, I always photograph and document the pattern so I can reinstate it exactly. That’s the sort of detail I keep in your job file in my client portal so you can always refer back to what was done.

Why Tiles Slip, Crack or Blow Off in the Wind

In my 18 years on the roof, I’ve noticed the same failures repeating over and over. When you see a broken or missing tile, the real cause is usually one of these:

1. Age and Weathering

Sun, frost, salt air and wind – especially along the seafront and on exposed hills – all speed up tile wear. Tiles can look fine from the pavement, but when I get eye-level I can often see micro-cracks or edge damage you’d never notice from the ground.

2. Failing Fixings (Nails, Clips, Mortar)

On older roofs the steel nails rust through long before the tiles themselves fail. On very old roofs, the only thing holding some tiles in place is friction and the weight of the ones above. One good storm and you suddenly notice a bare patch.

On modern roofs there should be mechanical fixings and clips in exposed areas. When I repair these, I don’t just “hook a tile back on” – I check how it was fixed and whether it’s up to current standards, especially around verges, ridges and eaves.

3. Poor Detailing at Edges, Valleys and Roof Windows

If you keep getting leaks around a chimney, valley, skylight or where a tiled roof meets a flat roof, the issue is usually detailing, not the field tiles. This is where decent lead flashing work and proper overlapping with any flat roofing makes a big difference.

4. Foot Damage

Satellite installers, solar panel fitters and even other trades “just popping up for a look” can crack tiles without realising. I can usually spot foot damage because the break pattern is different to age-related cracking.

How I Diagnose a Tile Problem Properly (Not Just From the Pavement)

If you call me out about tiles on your roof, I follow a simple sequence. It’s the same whether you’ve got one slipped tile or a whole slope that looks tired.

Step 1: Talk and Visual Check from the Ground

I’ll always start by asking what you’ve actually noticed: stains on ceilings, drips, debris in the garden, or just cosmetic worries. Then I’ll check from the ground with binoculars to see the general condition before I even get the ladders out.

Step 2: Close-Up Inspection

When it’s safe to do so, I go up to:

  • Check tile condition close up – surface, edges, fixings
  • Lift a few tiles in a discreet area to see the felt and battens
  • Inspect flashing, valleys and junctions with any flat roof areas

If the issue is linked to a flat area – like a dormer, extension or balcony tying into your tiled slope – I’ll also assess whether that section needs dedicated work, similar to what I do on a flat dormer roof.

Step 3: Check from Inside (Loft/Attic)

I like to look from the inside whenever possible:

  • Is there visible daylight through the tiles?
  • Any water staining on the felt or timbers?
  • Is insulation wet or compressed in certain spots?

This inside view often tells me how long the issue has been going on and whether it’s purely a tile problem or something deeper.

Step 4: Honest Recommendation – Patch, Sectional Repair, or Full Works

Once I’ve seen enough, I’ll tell you plainly which of these you’re looking at:

  • Simple patch repair – a few broken or slipped tiles on an otherwise healthy roof
  • Sectional repair – one elevation or particular area is failing (for example, the seafront side)
  • Full strip and relay – tiles are at end-of-life, or felt and battens have failed across the slope

If you want a professional opinion without any pressure, you can always book a free roof inspection in Sussex and I’ll walk you through exactly what I see, with photos.

Tiles on a Roof vs the Flat Roofs They Meet

In Brighton and Hove especially, I see a lot of mixed roofs: tiled main roofs meeting flat roofs on dormers, rear extensions, porches and balconies. The junctions between tiles and flat areas are some of the most common leak points I fix.

Tiled Roof to Rear Extension Flat Roof

If your main tiled roof runs down onto a flat rear extension, the upstand and flashing detail is critical. I often end up renewing the extension covering completely, similar to the way I handle a dedicated rear extension flat roof, and then re-dressing the tiles properly onto it.

Tiled Roof to Porch or Bay

Old porches and bays can have tiny tiled roofs or small flat areas underneath. If I find repeated leaks there, sometimes the smartest move is to renew the small flat roof section properly, like I do on a porch flat roof, then sort the tile overhang above it.

Tiled Roof to Balcony/Terrace

Where an upper balcony or roof terrace meets a tiled slope, the detailing has to be spot on. I regularly see rotten deck edges and soaked insulation where the tiles haven’t been integrated correctly with the balcony waterproofing. In these cases, I treat it as a combined job – tiles plus the terrace – in the same way I’d approach a balcony or roof terrace waterproofing project.

When to Worry About Your Roof Tiles – And When Not To

Here is my honest advice, based on what I’d do if it was my own house.

Signs You Should Act Quickly

  • Visible gaps where tiles are clearly missing
  • Brown staining or fresh damp patches on upstairs ceilings
  • Tiles moving or rattling in the wind
  • Loose or missing ridge tiles along the top of the roof
  • Fragments of tile and mortar regularly in the gutters or on the ground

If any of that sounds familiar, I’d treat it as urgent. A quick repair now is almost always cheaper than waiting until water has soaked through timbers and plaster. If you’re in Brighton or nearby and you’re already seeing dripping or active leaks, you can use my emergency slot system to request urgent leak repair and I’ll prioritise you as soon as I practically can.

Things That Look Scary but Aren’t Always

  • A bit of moss on tiles – ugly, but not always a structural problem
  • Old, weathered tiles on an otherwise dry, stable roof
  • Minor colour variation where old repairs have been done

I don’t upsell work that isn’t needed. If your roof tiles are old but doing their job, I’ll say so and leave it at that. Sometimes the best advice really is: “Keep an eye on it, but don’t waste your money yet.”

How I Quote for Tile Work – No Guesswork, No Vague “Day Rates”

The roofing trade has a bad reputation for vague pricing. I do things differently.

  • Online estimates – for many jobs you can get an instant ballpark price using my calculators, so you know roughly what you’re in for before I even visit.
  • Free site survey – I come out, inspect properly, take photos and talk through options.
  • Fixed-price quote – once I’ve seen the job, I give you a clear written price. No “plus this” or “subject to” surprises.
  • Client portal – you can log in to see photos of the work as it progresses, your schedule, invoices and any warranties in one place.

With tile work in particular, photos make a big difference. When you can see exactly what your roof looked like before, during and after, you understand why certain tiles or sections needed more attention.

Not Sure What’s Going On with Your Roof Tiles?

If you’re looking up at your tiles and wondering whether you’re looking at a quick patch or something bigger, the easiest way to get a straight answer is to let me come and have a proper look. I’ll talk to you in plain English, show you photos, and give you options at different budget levels where that’s possible.

You can reach out any time to arrange a visit, and I’ll treat your roof the same way I’d treat my own – fix what needs fixing, protect what’s still sound, and skip anything that’s just cosmetic scare-mongering.