Chloe Zhang
Detecting plastic pipes in walls is a critical step in many DIY projects. It is important to find the exact location of pipes to avoid costly damage and potential injury. While older homes may have metal pipes, newer homes are increasingly being installed with PVC (Polyvinyl Chloride) or plastic pipes. To detect plastic pipes, you can use a dedicated plastic pipe detector, which works by sensing changes in wall density or using thermal imaging to locate cooler spots. Alternatively, you can use a screwdriver to penetrate the plasterboard and listen for water flow, or gently tap along the wall with a hammer to detect hollow or solid sounds that may indicate the absence or presence of pipes.
| Characteristics | Values |
|---|---|
| Tools | Pipe detectors, stud finders, wall scanners, thermal detectors, screwdrivers |
| Features | Detects changes in wall density, uses thermal imaging, detects metal and plastic pipes, identifies electrical cables, gas and water pipes, identifies wood and live electricity |
| Precautions | Take off any metal accessories, turn off all appliances, shut off the water supply |
| Cost | £20-£300+ |
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What You'll Learn
Using a pipe detector
Before using a pipe detector, ensure that you are not wearing any metal jewellery or accessories, as this can affect the detector's readings. It is also important to remove any other electrical appliances in the vicinity, as metallic substances can influence the accuracy of the detector's results.
To use a pipe detector, first, run water through the taps to ensure that water is running through all the supply pipes in the wall. Then, use the detector to locate the pipes. Mark the location of any pipes you find, and be sure to follow the pipe's path.
Some pipe detectors, such as the BOSCH D-TECT 150, can locate the exact depth and location of the pipe. Stud finders can also be used to detect plastic pipes, but for more accurate results, a dedicated pipe detector is recommended.
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Manual detection with a screwdriver
If you are planning a home improvement or renovation project that involves drilling holes in your walls, it is important to locate any hidden water pipes to avoid serious damage and costly repairs. While there are various methods to detect plastic pipes in walls, such as using a wall scanner, stud finder, or borescope camera, one low-tech method is to use a screwdriver. Here is a step-by-step guide on how to manually detect plastic pipes in walls using a screwdriver:
Step 1: Turn off all appliances
Before beginning the detection process, ensure that all appliances that use water are turned off. This step is crucial to avoid any potential water leaks or damage.
Step 2: Run water through the taps
Turn on the water and let it run through one or more taps. This will help you locate the pipes by following the sound and vibration of the running water.
Step 3: Prepare the screwdriver
Take a long screwdriver and place the tip of the screwdriver firmly against the wall. You may need to apply some pressure to penetrate the plasterboard slightly.
Step 4: Listen for sounds and vibrations
With the screwdriver firmly in place, put your ear to the end of the screwdriver handle and listen carefully. Move the screwdriver along the wall, following the sound and vibration of the running water. The screwdriver acts as a makeshift stethoscope, helping you to detect the presence of water pipes behind the wall.
Step 5: Mark the location
Once you have identified the location of the water pipes using the screwdriver method, be sure to mark the spots on the wall. This will help you avoid drilling or cutting in those areas during your renovation project.
While the screwdriver technique may not be as accurate as using a wall scanner or borescope camera, it is a simple and low-cost solution to get a good idea of where the pipes are located. It is always better to exercise caution and take the necessary steps to detect hidden pipes before proceeding with any drilling or renovation work.
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Using a stud finder
Choose a Quality Stud Finder: Select a digital or electronic stud finder capable of detecting pipes. Look for features like “deep scan” mode, which can detect recessed objects like plumbing and electrical wires. Some stud finders also have metal detection, which can be useful for finding metal pipes or plumbing with metallic tape.
Prepare the Pipes: To make detection easier, turn on both the hot and cold taps for any faucets or showers in the room. Running water through the pipes helps the stud finder detect plastic pipes as solid objects. Ensure you turn on the taps in the room where you are searching for pipes, as plumbing often changes direction to avoid studs and other obstructions.
Scan the Wall: Place the stud finder on the wall at one corner and slowly slide it along to the opposite corner. Allow the stud finder time to locate each item. Mark the left and right edges of detected objects.
Identify Pipes: Objects that are not wall studs are likely to be pipes, conduits, wiring, or ducts. A quality stud finder may also identify the material of the detected object, helping you confirm if it is a pipe.
It is important to note that while stud finders are effective for detecting metal pipes and some plastic pipes with water running through them, they may not detect all types of plastic pipes accurately. For a more advanced solution, consider using a wall scanner or a borescope camera that links to your smartphone. Additionally, always exercise caution when drilling or cutting into walls to avoid accidentally damaging pipes.
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Thermal detectors
To use a thermal detector, it is recommended to run water through the pipes by turning on nearby taps or showers. This ensures that water is flowing through all the supply pipes, making them easier to detect. Once the water is running, you can use the thermal detector to scan the wall and identify the pipes' location based on the changes in thermal energy.
It is worth noting that while thermal detectors can help locate water pipes, they cannot directly detect moisture in walls. Instead, they detect subtle temperature differences and patterns that may indicate the presence of water. To confirm the presence of water, it is advisable to use a moisture meter in conjunction with the thermal detector.
Some specific products that can be used for detecting plastic pipes in walls include the Bosch D-TECT 150 and the MULTIDETECTOR PS 50. These tools can accurately locate PVC pipes and provide information about their depth and exact location.
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Tapping the wall
However, it is important to note that this method may not always provide accurate results, especially if you are dealing with plastic pipes, which are becoming increasingly common in modern homes. Plastic pipes, also known as PVC (Polyvinyl Chloride) pipes, do not conduct sound in the same way as metal pipes, so the tapping method may be less effective.
Additionally, it is worth mentioning that tapping with excessive force can potentially damage the wall or the pipe itself. Therefore, it is crucial to use a gentle touch when employing this technique. If you are unsure about the location of the pipes, it is always advisable to consult a professional or consider using specialized tools designed for pipe detection.
For those seeking a more advanced approach, there are electronic pipe detectors available that can identify both metal and plastic pipes. These devices, such as the Bosch D-TECT 150, use changes in wall density or thermal imaging to locate pipes. They provide accurate depth and location information, reducing the risk of accidentally drilling into a pipe. While these tools come with a higher price tag, they offer a more reliable solution for detecting pipes in walls.
In conclusion, while tapping the wall can be a starting point for pipe detection, it may not always yield accurate results, especially with plastic pipes. For more reliable outcomes, investing in specialized pipe detection tools or seeking professional help can be a wiser and safer approach before embarking on any drilling or renovation projects.
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Frequently asked questions
You can use a pipe detector, also known as a pipe locator. These handheld electronic devices can detect plastic piping by sensing changes in wall density or using thermal imaging to locate cooler spots.
Yes, you can try the "old school method" of using a long screwdriver. First, turn off all appliances that use water. Then, let the water run and firmly press the tip of the screwdriver into the wall. Place your ear against the handle of the screwdriver to listen for the water flow.
You can find pipe detectors at Toolstation, including multi-detectors and professional digital wall scanners from brands like Bosch and Stanley. The MULTIDETECTOR PS 50 and BOSCH D-TECT 150 are two options that can locate plastic pipes.
Yes, it's important to remove any metal accessories you're wearing, as metal jewelry can interfere with the operation of the pipe detector. Additionally, always shut off the water supply before attempting any work on the pipes.
Drilling into a wall without checking for pipes can lead to serious damage to the pipeline, resulting in costly repairs. It can also be dangerous, as it may cause hidden water leaks that are difficult to notice during repair.
