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How to spot a water leak in your home

30/11/2020

17 Comments

 

Not only do water leaks create major damage to your home and property they are also highly expensive to locate and repair. Not to mention the water bills!

Most water restorations we attend are for an obvious water leak or burst pipe with the most common being the fexi hose to your tapware in your vanity or kitchen cabinet bursting and flooding the surrounding area. With such an obvious leak they are usually spotted almost immediately when someone comes home from work or wakes up in the morning to find water pooling on the floor. With a fast attendance time we can mitigate a lot of the damage caused. But how do you spot a water leak if it is concealed in your wall or even under your concrete slab?




Sound

Many people report hearing dripping or running water before noticing any damage especially if that water leak is under your concrete slab or concealed in an external wall. The owner of the property in the below photos engaged a plumber to confirm his suspicions after he heard water running and was unable to locate the source.

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Blistering to walls

Here in Western Australia most properties in the metro areas are double brick with a solid plaster render. Water damage to this type of wall often reveals as blistering, bubbling or rippling, this usually starts at the location of the leak then expands as moisture levels raise in the area immediately around and below it. It can start off as small as a coin and can rapidly grow.

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Staining and discolouration

Water staining to plasterboard is usually obvious and seemingly can appear overnight, however this is not the only building material that stains as a result of water ingress. Flooring whether timber, carpet or laminate can all stain, discolour or desaturate in colour as a result of a water leak. Staining to carpet is usually the most visible especially if mould growth has begun as exampled in the photos.
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Smell

One of the best giveaways that you have an ongoing water leak that has progressed far enough for mould growth is that musty stale odour that usually accompanies it. Mould growth requires the presence of moisture and can grow on the rear of your skirting boards, floorboards, along the smooth edge of your carpet and on carpet backing. It can only grow in wall cavities if you have plasterboard or timber frame. Once mould growth becomes evident it indicates your leak has been going for some time. As per one of our previous blog posts mould growth is unhealthy for humans and needs to be quickly addressed.
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Changes to timber flooring

Timber flooring including floating laminate flooring can cup and swell leaving the appearance of wider gaps between the lengths as they swell and push away from each other. On a more minor scale cupping can occur where the surface of the boards are no longer flat and it is not until you run your hand across the boards or look at them from a very low angle that you notice the damage occurring. We included an extreme example in the photos as we find it amazing to what level timber can warp after water ingress has occurred.
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Sagging and Cracking to plasterboard

Plasterboard can be found in a few places throughout your property, your ceiling lining walls are often clad with plasterboard if you have a timber or steel stud wall. A sagging ceiling can be the result of water damage from either a leaking/ burst pipe or potentially a leak in your roof. Water damage to plasterboard is not always accompanied with water staining, which is the more obvious visual tell-tale sign that draws our attention to the ceiling. Plasterboard can also crack as a result of the sagging and can become at risk of collapsing if it is the ceiling.
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Being familiar with signs of water leaks and/or ingress in your homes is a useful skill. It limits prolonged damage to your home and property and can also save you $$$ on your next water bill.
Insurance companies may  not cover water leaks that have been on-going or are due to maintenance. (Such as a deteriorated roofing , ongoing leaky pipes or failed window seals) Which is why it is important to spot them early on and get them fixed.
If you suspect a water leak or water damage in your property give us a call, we can come out and provide a report, leak detection or flood test as well.

- Louise Olman
Project Administrator and Report extraordinaire
17 Comments
Landon "RusticLumberCo.com" Edgington link
11/2/2021 06:55:06 pm

Oh crap this is exhausting! Our neighbor just got a recent issue same with that, called the professionals and problem solved. Thank you guys for being there for us.

Reply
Kai Hughes link
16/12/2021 10:34:28 pm

Flooring whether timber, carpet or laminate can all stain, discolour or desaturate in colour as a result of a water leak. Staining to carpet is usually the most visible especially if mould growth has begun as exampled in the photos. Great post thank you!

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Charlotte White link
27/12/2021 04:41:49 am

Many people report hearing dripping or running water before noticing any damage especially if that water leak is under your concrete slab or concealed in an external wall. Nice tips thanks to sharing with us!

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Plumbing company link
11/3/2022 04:02:38 pm

These are all true. We used to live before in the 1st floor of a double story house. We observed blistering on the wall and sure enough there was a leak on their water system.

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jarboes link
20/9/2022 09:45:22 pm

The cost of repairing damage caused by a leak can be quite high in many cases. A water leak in your home or business can cause a lot of damage and be very expensive to fix. Install a water leak sensor near each source of water so that leaks can provide alerts with an audible alarm about issues before they cause too much damage. Water leak detection systems come in a variety of types, so you should find the right one for your needs. At the first sign of a leak, find your shutoff valve and turn off the water.

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Tracy White link
18/10/2022 05:47:46 am

Water staining to plasterboard is usually obvious and seemingly can appear overnight, however this is not the only building material that stains as a result of water ingress. Thank you for taking the time to write a great post!

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Best Access Doors link
21/10/2022 02:27:22 pm

Thank you for sharing how to spot water leaks at home. As a homeowner, I'll take note of this. Let us know if you need more information about valve boxes and other quality plumbing materials for an upcoming blog.

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Che Quizon link
23/11/2022 09:48:53 am

This is vey informative! I would bookmark this in my browser and share with my friends.

Reply
Jasontstephen link
23/11/2022 03:31:42 pm

All of these are true. We previously resided on the first floor of a two-story house. We saw scorching on the wall, and sure enough, their water system had a leak.

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Roofing Sunshine Coast link
23/2/2023 07:59:45 am

As a local roofing company based in the Sunshine Coast, we appreciate the effort put into this informative blog post. Spotting water leaks early is essential in mitigating damage to your home and preventing high repair costs. However, we noticed that this blog post did not highlight the importance of regular roof maintenance in preventing water leaks.

A deteriorated or damaged roof can be a major source of water leaks, and these leaks can go undetected for a long time if not regularly checked. Additionally, roof leaks can cause damage to insulation, ceilings, and walls, leading to further problems. As a roofing company, we offer roof inspections and maintenance services that can help identify and fix any potential issues before they become major problems.

It's important to note that insurance companies may not cover water leaks caused by poor roof maintenance, which is why we recommend regular roof maintenance as a preventative measure. So, if you suspect a water leak in your home, give us a call, and we can come out and provide a comprehensive inspection, leak detection, or flood test for your roof.

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Best Roofing Company in CT link
7/4/2023 03:21:51 pm

I was looking for this information relating to how to spot a water leak in your home. You have really eased my work, loved your writing skill as well. Please keep sharing more! You have a great visualization and you have really presented this content in a really good manner.

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mold removal san francisco link
5/9/2024 12:56:40 pm

Excellent product! It cleared the mold from my basement walls after just one use.

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eliteperformanceplumbingky link
28/2/2025 10:16:50 pm

Great insights! Checking the water meter for hidden leaks is a smart tip. I’ve also noticed that moldy smells can sometimes be a big giveaway. Do you have recommendations for DIY fixes before calling a plumber?

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Roofing Contractor Portland link
13/11/2025 04:22:21 pm

Excellent insights, Louise! Water leaks can indeed cause significant and costly damage if not addressed promptly, especially when they originate from the roof. At KVN Portland Roofing, we’ve seen how unnoticed roof leaks can lead to many of the issues you mentioned, such as blistering walls, ceiling stains, and even mould growth. As a trusted roofing contractor in Portland, OR, our team specializes in identifying and repairing hidden roof damage before it escalates into major structural problems. Our comprehensive roofing services include inspections, leak detection, and full roof replacements to ensure your home stays safe and dry year-round. Homeowners who act early with a professional roofing assessment can often avoid the extensive repairs that hidden water leaks create.

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Hotel Security Guard Services New York link
21/11/2025 10:10:31 pm

Really helpful breakdown of the less obvious signs of a leak—especially the parts about blistering walls and that musty smell that often shows up before visible damage. A lot of homeowners don’t realise how fast flooring and plasterboard can deteriorate once moisture gets in, so your examples and explanations make the risks very clear. From a property protection standpoint, early detection like this is just as important as physical security; in our work with larger buildings and hospitality venues, we see how unnoticed leaks can become major safety and liability issues. If you ever create content around broader risk management for residential or commercial properties, feel free to reach out to discuss how combining proactive maintenance with professional support such as Hotel Security Guard Services New York businesses rely on can help keep both people and properties safe.

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Chimney Inspection Sanford, ME link
19/12/2025 03:50:15 pm

Great post highlighting how subtle water intrusion can be and how important early detection is, especially since many homeowners do not realize that chimneys are also a common entry point for moisture. At Frechette Chimney Sweeping, we often see issues like staining, wall blistering, and musty odors that trace back to deteriorated chimney flashing, cracked masonry, or damaged caps, all of which can allow water to travel into walls and ceilings over time. As a trusted Sanford chimney sweep, our inspections focus on identifying these hidden problem areas before they lead to costly repairs, complementing the signs you outlined so well. Regular chimney maintenance plays a key role in protecting the overall structure of a home, and pairing that awareness with the leak indicators you described helps homeowners stay ahead of long-term damage.

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Very impressed with Hinch Plumbing’s service. link
28/1/2026 05:41:08 pm

Very impressed with Hinch Plumbing’s service. They arrived on time, worked efficiently, and left everything neat and tidy. Great local plumbers!

Reply



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    We have been in the Insurance building Industry for 15 years. Our varied team are experienced, qualified and committed to good service.
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