Water Leak in the Roof: The First 24 Hours and What I’d Do in Your House

What to Do in the First 24 Hours of a Roof Water Leak

When customers call me about a sudden water leak in the roof, they’re usually stressed, worried about the ceiling collapsing, and not sure who to ring first – roofer, insurer, or emergency plumber. In my 18 years on the roof, I’ve noticed that what you do in the first 24 hours can easily double or halve the final repair bill.

This article isn’t about how I technically fix the leak – I cover permanent repair methods in detail on my main leak repair page. Here, I want to walk you through exactly what I’d do if your roof started leaking today, step by step, before, during and just after the storm.

Step 1: Make the Inside of Your Home Safe (Before You Even Think About the Roof)

If you ask me, I’ll tell you straight: the very first job is to protect your home and electrics, not to climb on the roof.

Protect your electrics and ceilings

Turn off electrics in affected rooms if water is near light fittings, sockets, or the consumer unit.
Move furniture and valuables away from the affected area.
Put a container under any drips – a bucket, washing up bowl, even a bin will do.
Lay down towels or an old sheet around the container to catch splashes.

When customers ask me whether to poke a bulging ceiling, my honest advice is this: if you can see the plasterboard bowing with water sitting behind the paint, that water is going to come out one way or another. Gently pierce the lowest point with a screwdriver or bradawl and let it drain into a bucket while you stand safely out of the way. If the bulge is large, call someone in – a heavy, waterlogged ceiling can fail suddenly.

Don’t rush onto the roof in bad weather

I know the temptation is strong to grab a ladder and ‘just have a quick look’. Please don’t. Wet tiles, strong wind and a shaky ladder are how people end up in A&E. In a storm, the safest place for you is inside, managing the water and documenting what’s happening.

Step 2: Work Out What Kind of Leak You’re Dealing With

Before I even visit a property, I usually ask a few questions on the phone. You can ask yourself the same things to understand how urgent it is and how big the problem might be.

Question 1: Is the leak active only when it rains?

Leaks only when it rains – this usually points to a problem with tiles, slates, flat roof coverings, flashings or gutters.
Leaks even on dry days – this can be plumbing (pipes in ceilings/walls), tanks in the loft, or condensation issues pretending to be a roof leak.

If you’re seeing drips every time you run a shower, flush a toilet, or use central heating, that’s your cue to call a plumber or heating engineer before a roofer.

Question 2: Where exactly is the stain or drip?

The position of the leak inside the room is a big clue. Here’s how I mentally map it:

Middle of the ceiling: Often under a flat roof, a valley, or where two roofs meet.
Near an external wall: Possibly related to flashing, parapet walls, or gutters overflowing.
Around a chimney breast: Very commonly chimney flashings or the top of the stack letting water in.
Around a loft hatch or down a wall: Could be condensation in the loft, or a leak running along a timber before it shows itself.

Water is sneaky – it doesn’t always appear directly under the external problem. In my 18 years doing this, I’ve seen water enter at a chimney, travel along rafters, and appear two or three metres away in a bedroom.

Question 3: What type of roof is above the leak?

This isn’t about diagnosing every possible defect – it’s about understanding your risk and urgency.

Flat roof above? If it’s a garage, rear extension, porch, dormer, bay roof or balcony, ponding water and old felt are common culprits. For those, my dedicated flat roof services pages walk through typical options and costs for rebuilding tired coverings.
Pitched roof above? Think slipped/broken tiles or slates, rotten battens, or torn felt underlay, especially on older terraced houses around Brighton and Hove.

Step 3: Temporary Containment – What’s Reasonable for a Homeowner

When customers ask me what they can sensibly do themselves without making it worse, here’s my honest view.

Good DIY actions (inside the house)

Catch and control the water with buckets and towels.
Carefully relieve any heavy ceiling bulge while staying well clear of where water will fall.
Open windows slightly in the affected room once the rain stops to help dry the area.
Photograph everything: the ceiling, walls, floor, and where the water is entering.

Risky DIY actions I wouldn’t recommend

Walking on the roof without proper ladders, footwear, and experience.
Covering a flat roof with a tarp in strong winds – tarps can act like sails and pull more tiles or felt off.
Spraying random sealants into cracks around chimneys, skylights or joints – this often traps water behind and makes diagnosis harder.

If you genuinely have an emergency – ceiling about to collapse, water running near electrics, or a major opening in the roof – that’s when it’s worth using my priority emergency leak service so I can assess how quickly I need to get to you.

Step 4: How I Trace a Water Leak in the Roof (Without Guesswork)

From your point of view, water is coming through the ceiling and that’s that. From my point of view, the real question is: how is water travelling through the layers of your roof to get there? That’s what I’m looking for during a proper investigation.

Inside inspection: loft and ceilings

When I arrive at a property with a suspected roof leak, I’ll usually start inside, not outside:

Check the loft space for damp timbers, wet insulation, and obvious tracks of water.
Look for daylight through the roof where it shouldn’t be.
Note where water is actually entering the loft, not just where it’s appearing in the room below.
Check for signs of condensation on nails and felt – this can mimic a leak.

Outside inspection: access and safety first

Only once I’ve got a good idea from inside do I go up to the roof. On smaller jobs, I can often do this with a long ladder; on bigger or more awkward properties, scaffolding is safer and more efficient. To help you get a feel for access costs, I’ve even built a rough scaffolding price calculator that gives you a ballpark straight away.

Why “just patch it” often backfires

People often say, “Can you just patch that bit there?” Sometimes a small, targeted repair is all you need. But I’ll be honest if it isn’t.

For example, on an older flat roof where the felt is brittle and crazed all over, sticking a patch on the obvious split is a short-term plaster on a long-term problem. The same goes for pitched roofs where battens and underfelt have simply reached the end of their life – you fix one visible leak and another appears a metre away a few months later.

That’s why I always separate emergency containment (stop the immediate damage) from permanent repair or replacement (sort the underlying issue). They’re not the same job.

Step 5: Insurance, Evidence and Talking to Your Insurer

When customers ask me, “Is this covered by my insurance?”, the truthful answer is: it depends entirely on your policy wording. But I can tell you what insurers usually want to see.

What to record from day one

Take clear photos and short videos of the leak, the room, and any damage to contents.
Note the date and time of the leak, and the weather conditions (heavy rain, storm, snow, etc.).
Keep receipts for any emergency actions – dehumidifiers, electrician visits, or temporary accommodation if it comes to that.

What I can provide as your roofer

When I’m involved, I can usually help by:

Writing a clear report describing the cause of the leak and the condition of the roof.
Providing a fixed-price quote for the permanent works, which insurers often ask for.
Supplying photo evidence from the roof itself, through your online client portal.

Most policies cover sudden, unforeseen damage rather than slow deterioration. So if your roof is simply old and worn out, the insurer may see the leak as a maintenance issue. I’ll always be upfront about what I’m seeing so you don’t waste time arguing a hopeless claim.

Step 6: Deciding Between Repair and Replacement

Once the immediate drama has passed, you’re faced with the bigger decision: do you repair the local problem, or is it time to bite the bullet and replace a larger section of the roof?

Flat roofs: garages, extensions, porches and more

Flat roofs are a big part of my work across Brighton, Hove and Worthing. If your leak is coming from a garage or similar, it’s worth getting an idea of what a proper rebuild costs versus chasing endless patches. To make that easier, I’ve put together a garage flat roof cost calculator you can use without having to ring anyone.

The same logic applies to other small flat roofs – porches, bays, dormers and balconies. One clean, modern system properly detailed is usually cheaper in the long run than constant emergency visits every winter.

Pitched roofs: tiles, slates and underfelt

For pitched roofs, especially older terraced houses, a recurring water leak in the roof can be a sign that the battens and felt under the tiles have finally given up. In those cases, I’ll normally talk you through the difference between spot repairs and a more thorough strip back to replace the roof battens and felt membrane properly, so you’re not constantly firefighting.

Step 7: How I Keep You in the Loop During Leak Repairs

One of the big complaints I hear about roofers is “I had no idea what they were doing up there.” That’s exactly why I set my jobs up the way I do.

Fixed prices, no surprises

Once I’ve inspected the leak, I give you a clear, fixed-price quote. If something is uncertain – hidden timber, for example – I’ll explain the worst-case scenario before I start, not after.

Your online client portal

During the works, you get access to a secure portal where you can:

See the schedule for your job.
View daily photo updates so you can actually see what’s been done.
Download invoices and warranties in one place.

This is especially handy if you’re using the information for an insurance claim or if you’re not always at the property while I’m working.

When You Should Call Me About a Water Leak in the Roof

Here’s my honest advice on when to pick up the phone straight away:

There’s water near electrics or you can smell burning or see sparking.
The ceiling is bowing visibly or cracking due to trapped water.
The leak is getting worse each time it rains.
You’ve had multiple “repairs” from different people and it still leaks.

If you’re not sure how bad it is and just want a straight answer, the easiest next step is to book a free roof inspection in Sussex. I’ll have a look, tell you exactly what’s going on, and give you a fixed price for putting it right – no pressure, no hidden add-ons.

Whether your water leak in the roof is a one-off during a storm or a slow, nagging drip that’s been ignored for years, the key is to act early, control the damage inside, and then plan a proper solution rather than endless sticking plasters. That’s how I approach every leak I’m called out to – and it’s how I’d want someone to treat my own home.