Moisture can hide in so many places in a home, and when it does, you might need a professional to help you detect where it’s hidden or even explain why it is hiding there. When moisture starts to build up in a house, it usually starts with very subtle signs and you may never even take note of these signs until they start causing obvious problems in the house. Some homeowners might actually see these subtle signs and overlook them because they feel it’s not appearing dramatic enough to be a cause for concern or because they think it doesn’t look like a problem that needs an urgent solution. But guess what? That’s exactly the kind of trick that hidden moisture wants to play on you.
Unlike obvious leaks that need immediate attention, hidden moisture operates silently behind walls, underneath floors and in corners that your eyes may not catch easily when you’re indoors. It usually stays completely out of sight and by the time it becomes visible, it must have weakened materials for weeks or even months.
The problem of hidden moisture in a house is even more common in modern homes because of the way these homes are designed. Most modern homes are built to be very efficient and as a result, they have tightly sealed windows and doors that do not allow air to escape. If the air conditioning of the house isn’t working, it can make the house more humid and moisture will start forming in hidden spots.
Aside from tightly sealed windows, doors and insulation, another design in modern homes that allow moisture to have a hiding place is pipes concealed inside the wall. When developers implement this design in modern homes, it makes the house look neat and uncluttered and you’ll not have pipes exposed on the outside or running across the walls. But if there’s the smallest leak in these pipes, you might not know until it has occurred for months and started causing problems for you and your lovely home.
Many homeowners may never detect hidden moisture because of the way they usually assess problems in the house. Some people will just look at the walls whether it appears fine, if it looks fine in their eyes, then they’ll assume all is well and there’s no moisture problem. But that’s not how hidden moisture works, it doesn’t announce itself at the early stage so you can’t conclude that it’s not there because the wall still appears fine. Moisture can spread sideways and seep into materials quietly without showing obvious surface clues. So how then would one detect hidden moisture when it’s actually hidden behind walls or other materials? This is where a professional comes in.
A professional usually uses a totally different approach. Instead of banking on visible clues or obvious damages, a professional assumes that moisture can be found almost everywhere, even in places where it shouldn’t. This makes them approach the search for moisture with intent and not just randomly. Professionals have a good understanding of how water moves or behaves in a building and they know where moisture problems are most likely to occur. They do not rely on guesswork because they have the right tools and know the best techniques to detect changes that are happening beneath surfaces even before damages become obvious.
When it comes to issues of hidden moisture, what you cannot see is usually what causes the most trouble and by the time the moisture decides to show itself, the problem would have been in the middle stage or the end.
What Causes Hidden Moisture in the First Place?
Hidden moisture can come from so many sources and still maintain its stealth mode until it has done enough damage before becoming obviously visible. Let’s look at some of the causes of hidden moisture in a home.
Leaking Pipes: One of the most common causes of hidden moisture in a house is a burst or cracked pipe. In many modern homes, water pipes are installed in places that are completely hidden from view such as inside walls and above ceilings. Whenever such a pipe has little issues like a tiny crack or the joints become slightly loose due to water pressure, the water will gradually escape from the pipe and begin to soak the nearby materials. These slow leaks can go unnoticed for months and as it accumulates, it spreads quietly into other areas. Before you can say JACK, the damage has spread from the leaking spot to other parts far away from it and this happens because moisture often spreads sideways inside walls. It’s important to note that hidden moisture as a result of leaking pipes are not commonly recorded in bedrooms, except the bedroom is sharing walls with a bathroom or kitchen.
Roof Leak and Ceiling Intrusion: Hidden moisture in a home can come from a leaking roof. If there’s a crack anywhere on your roof or one of the flashing becomes worn, rainwater can find its way into your house. Now, when rainwater enters through the roof, it doesn’t always drop directly on your head while indoors or on anything else inside your house, instead, it soaks into insulation or stays on top of the ceiling boards. Two things can happen at this stage. Firstly, the rainwater can accumulate on the ceiling boards or insulation and when it overflows, it starts dripping in the house. At this point, it can no longer be considered as hidden moisture. On the other hand, the water might be contained on the ceiling boards or insulation and it’ll stay there for a long time and start soaking into any material that permits. This hidden moisture can weaken the ceiling boards or allow mold growth to occur in the ceiling.
Poor Ventilation: Another culprit that causes hidden moisture in a house is poor ventilation or condensation issues. During day to day activities like cooking and bathing, a surprisingly high amount of moisture is usually released into the air. If your house is well-ventilated (you have more than one window that can stay wide open), then the moisture will escape through the exit spots. However, if your home is enclosed or poorly ventilated, the moist air from your bathing and cooking chores will remain inside the house because it has nowhere to go. As time goes by, the moist air settles into walls and ceilings and creates damp conditions that may never fully dry.
Rising Damp: Do you know that moisture can move upward against gravity? Yes, moisture from the ground can travel through walls. This scenario is most common in buildings that do not have proper damp proof barriers. The moving moisture spreads upward and sideways, and it quietly soaks the paint on your walls. After sometime, you may notice discoloration in your paint or the paint may start bubbling and peeling off near the base of the walls.
Faulty Household Appliances: It is also possible that the moisture problem you’re experiencing is coming from faulty home appliances. Appliances like washing machines and water heaters can develop small leaks and you may not notice it for a very long time. This is because the leak usually accumulates quietly in hidden areas like behind the unit or underneath them.
Another subtle source of indoor moisture that is usually ignored by most people is breathing. Our breath adds to the amount of warm air indoors (especially if there are more people in the room) and if this air doesn’t have a way to escape, it’ll linger and join forces with other sources of warm air like cooking and hot baths. Since all of these moist air have nowhere to go, they’ll settle in hidden corners, walls and ceilings areas.
All the moisture sources we’ve discussed so far do not release moisture in one single wave and the moisture doesn’t cause an obvious damage immediately, instead, they release moisture slowly and consistently but out of sight. That’s why it is called hidden moisture.
Why Hidden Moisture Is Difficult to Detect Without Tools
One of the most common misconceptions about moisture problems is that it can be spotted easily, but that’s not always the case. Moisture can sometimes be misleading because it behaves in ways you can’t easily predict and it appears in places that don’t reflect where the problem actually started. This is why you might need a professional to check with tools or you could even check yourself if you know how to use the right tools. Let’s see some reasons why you may need a tool to determine or detect hidden moisture in your home.
Moisture Travels Away From the Source: We all know that water does not stay in one place when it is poured on a plain surface or when it gets soaked into a material like wall or wood, it only stays put when it is inside a container. When water or moisture enters a structure, it usually moves sideways or travels downward in the direction of gravity. What this means is that the visible signs of water intrusion like stains, warped surface and peeled paints might appear far away from the actual source of the leak. This usually makes detection difficult for homeowners. So the visual clues that you see aren’t always where the problem started from. Without a tool, you’ll not be able to trace the actual spot.
Evaporation Masks the Problem: Evaporation makes moisture detection even more confusing. If there’s moisture on a wall or any other surface in a house, this moisture can dry out temporarily due to evaporation and create a false sense of security. Most homeowners will assume the problem is gone and some might not even take note of the initial wetness at all before it dries. If this cycle of wetting and drying continues for weeks or months, it will start damaging the material gradually without the homeowner being aware.
Building Materials Conceals Problem: Another factor that makes it difficult for homeowners to detect hidden moisture is the building material itself. Most building materials like drywall, tiles and wood are good at concealing the activity of moisture beneath the surface. This means moisture can stay trapped under or inside these materials and continue to spread, meanwhile the outer surface of the material appears perfectly normal. Before the moisture will show visible signs on the outer surface of the material, the damage must have been done already.
All of these factors make detection very difficult if you do not have the right tools.
The First Step Professionals Take -Visual Inspection
Before a professional gets their hands on any advanced tools, they usually start by looking carefully at the areas that require inspection in the home. Professionals have trained eyes and some have seen all the twists and turns of moisture movement so they know how to pick up patterns that most homeowners would walk past.
Discoloration: When inspecting a house, one of the first things that professionals look out for is the slightest discoloration on the walls, ceilings or any other material where moisture can hide. Moisture always leaves a subtle visual clue behind and some of these clues can only be found when you search carefully. The visual clue might be a faint yellow or slightly darker patch on the walls or ceilings. These marks are usually not random, they often follow irregular shapes and spread outward in ways that hint at how water has moved beneath the surface. So while a faint stain might look harmless to a homeowner, it’s actually a starting point for a professional.
Peeling or Bubbling Paint: The next visual clue that professionals take note of is peeling and bubbling paint. When moisture soaks into a material (wall, ceiling or wood) or gets trapped behind a painted surface, it breaks down the bond between the paint and the wall or other materials. What you’ll see next is bubbling, flaking or peeling of the areas that have absorbed moisture for a long time. A bubbling or peeling paint is a sign that moisture has been active underneath the surface for a while and professionals always look out for it.
Warping: Another material that professionals inspect is wooden materials and this is because wood usually reacts faster to moisture intrusion. If your floors are made of wooden material, it might start to buckle slightly as water seeps into it. Baseboards might also curve outward and cabinets might lose alignment. These changes are usually very subtle and you may not notice them unless you know what you’re looking for. But professionals know how to catch them.
Mold Growth: During inspection, professionals also look out for dark stains that resemble mold colonies on the walls or ceilings. Molds are usually found in hidden corners or along edges where there’s limited airflow and professionals know how to trace the source of mold growth even if it’s not immediately visible.
Areas Prone to Moisture Accumulation: Aside from the above visual clue, there are also certain areas that professionals look out for. Some of the areas are beneath windows, near roofs around plumbing fixtures and behind appliances. Professionals instinctively check these zones first, not because damage is always visible there, but because over time, experience has shown that’s where problems often begin.
Professionals Use Moisture Meters
After completing the visual inspection, the first tool that most professionals move to is the moisture meter. This device is built to take the guesswork out of moisture detection. It measures the amount of moisture that is present in materials like wood, drywalls or flooring and determines if the moisture in the material is within the normal range or if there’s an unusual level of moisture hidden beneath that might be associated with dampness.
Mold inspection professionals make use of two major types of moisture meter and each one is built differently and serves a slightly different purpose.
Pin type Moisture Meter: This type of moisture meter is the more direct option and it usually has two small probes that you can insert into the material that you want to test. Pin-type moisture meters usually use electrical resistance between the pins to calculate the moisture level inside a material. The advantage of this type of meter is that it usually provides very precise readings but it also has its own downside which is that it leaves tiny pinholes on the material it tested.
Pinless Moisture Meter: A pinless moisture meter is built without a pin so you do not need to pierce through the material to get accurate moisture level reading. All you need to do is just place the meter on the surface of the material and the machine will scan the material using electromagnetic signals. Pinless meters are great for testing moisture level in finished walls, floors and areas where damage needs to be minimized. Although pinless meters may not measure moisture level as deeply as the pin-type, they’re still a great tool for scanning large surface areas and detecting potential problem zones.
So now that we know about the two major types of moisture meter, is that all there is? The answer is NO. This is because the main skill doesn’t just lie on the ability to use the tool but the ability to interpret the readings. Professionals don’t just look at a single reading to draw conclusions, instead, they compare readings across different areas to check for inconsistencies. So, if a high reading was gotten in one spot, a professional will not just jump to conclusion, he’ll compare the reading to surrounding dry areas to know whether the difference is significant or not. A professional also understands that every material has its baseline moisture level so they use that knowledge to differentiate between acceptable conditions and potential problems.
It’s important to note that moisture meters aren’t perfect and they can sometimes pick up moisture in the surface of the material without detecting what’s happening deep down inside the material. For this reason, moisture meters cannot be relied upon in isolation, instead, they act as a guide to narrow down suspicion.
Professionals Use Infrared (Thermal) Imaging Cameras
Apart from moisture meters, another tool that professionals use to detect or check for moisture in a material is a thermal imaging camera and this device works on the principle of heat or temperature difference detection. Every surface whether wood or walls emits heat and an infrared camera is designed to capture these temperature variations and translate them into a visual image. Areas that have different temperatures appear as contrasting colors and this allows professionals to spot irregularities that would have gone unnoticed.
Thermal imaging can help professionals achieve two major things when it comes to detecting moisture in a house. Firstly, it can help catch cold spots in places where the naked eye cannot see such as behind walls, under floors and across ceilings. Secondly, it produces images that can help a professional track the movement of moisture within the material.
Another major advantage of using thermal imaging is the speed and convenience that comes with the tool. Thermal cameras allow professionals to scan large areas quickly without causing any damage to the walls, floors or wood material. When compared to pin-type moisture meters that penetrate walls and other surfaces, thermal imaging makes sure the walls remain intact as it produces a detailed image of the moisture condition.
As powerful as thermal cameras are, they’re not without their own downsides. Since they work with the concept of temperature difference and we know that temperature difference in a material or house can be caused by other factors, this makes the reading from this tool sometimes unreliable. To create a balance, most professionals treat thermal imaging as part of a larger process instead of taking it as a single final answer. This means they can conveniently use it to identify suspicious areas and then proceed to using other tools like moisture meters to confirm their findings.
Professionals Use Hygrometers and Humidity Testing
A hygrometer is a tool that can be used to measure indoor humidity levels or in simple terms- the amount of moisture present in the air.
Most of the tools we discussed above usually focus on what is happening inside the walls or floors but hygrometers use a totally different approach by focusing on measuring the moisture content in the air rather than the material. This approach is sensible in some cases because moisture sometimes starts from humid air before it settles on those surfaces or materials.
Professionals rely on hygrometers when they want to get a clear picture of a home’s overall moisture environment. So instead of guessing whether a space feels “damp,” they just rely on actual readings from the hygrometer. This helps determine whether conditions are normal or if there’s an underlying issue contributing to elevated moisture levels.
When to Call a Professional
Whenever you notice a musty smell or faint stains on the walls, it’s possible that moisture is gradually taking a toll on your surfaces. If you’re suspecting hidden moisture in your walls or other surfaces in your home and you’ve tried all you could but can’t still identify the cause or source of moisture then you shouldn’t waste time in reaching out to a professional. Guessworks don’t help!!!
Professionals can help you with services like moisture inspection, leak detection and water damage restoration service. But if the issue is not in your home then you can count on mold remediation experts that offer commercial mold remediation services.
