Installing plumbing systems, whether in a new build or during a renovation, requires precision and planning. Mistakes can lead to costly repairs, water damage or ongoing maintenance issues. To help ensure a smooth and trouble-free installation, in this article, we’ll talk you through the 10 most common plumbing installation mistakes and how to avoid them.
1. Incorrect Pipe Sizing and Its Consequences
Using pipes that are too small or too big can cause low water pressure, blockages or even burst pipes. Always follow the recommended pipe sizes according to the type of plumbing system and the local regulations. Use a pipe sizing chart to determine the correct diameter based on flow rate and pressure requirements, we also recommend that you consult a professional plumber to ensure compliance with building codes. Wrong sizing can lead to inefficiency and in some cases complete system failure over time.
2. The Importance of Proper Pipe Sloping
If drainpipes are not sloped properly, water and waste won’t flow efficiently which will lead to slow drainage or blockages. Waste pipes should have a minimum slope of 1/4 inch per foot. Using a level during installation helps maintain the correct angle and prevents standing water. Always ensure you avoid sharp bends and unnecessary changes in pipe direction so that drainage is smoother and reduces the risk of clogging over time.
3. Why Teflon Tape and Pipe Sealant Matter
Not using thread sealant can cause leaks in pipe connections, leading to water damage over time. Apply Teflon tape or pipe joint compound on threaded connections to create a watertight seal. Wrapping the tape around the threads in the direction of tightening ensures a secure fit and prevents leaks that can escalate into major problems. Proper sealing techniques extend the longevity of plumbing fixtures and reduce the likelihood of costly repairs…which is the last thing you want!
4. Avoiding Over-Tightening Fittings
One of the more simple plumbing installation mistakes to avoid is over-tightening pipe connections. These can often crack fittings or damage threads which causes leaks. It’s best to tighten fittings firmly but not excessively so hand-tighten them first, then use a spanner for an additional quarter or half turn if needed. If a fitting still leaks, it should be disassembled, checked for debris or incorrectly applied sealant and then re-tightened carefully. Over-tightening not only increases the risk of leaks but also makes future maintenance more challenging.
5. Ensuring Proper Venting for Drainage Pipes
Without proper venting, drainage systems can be slow or create gurgling noises due to airlocks. Installing vent pipes correctly allows air to escape and this will ensure smoother drainage. Following local building codes for venting requirements is essential and where traditional venting isn’t feasible, an air admittance valve (AAV) can prevent negative pressure and slow drainage issues. Proper venting also prevents sewer gases from entering the home and affecting the water supply, maintaining a healthy living environment.
6. Choosing Compatible Pipe Materials
Combining incompatible materials, such as copper and galvanized steel, can cause corrosion and leaks over time. Checking material compatibility before replacing older pipe sections ensures a long-lasting and efficient plumbing system. Using the right materials is crucial for maintaining water quality and preventing premature pipe failure. When replacing older pipe sections, it’s essential to ensure copper pipes or copper tubing are compatible with the existing system to avoid corrosion and premature failure.
7. Balancing Water Pressure in Your System
Incorrect pipe or fixture choices can lead to excessive or inadequate water pressure, affecting performance and efficiency. Measuring water pressure before installation and installing pressure regulators if necessary will help maintain the proper balance, especially in a central heating system where consistent water flow is essential. High-pressure areas may require pressure-reducing valves (PRVs) to prevent long-term damage to appliances and fixtures, particularly those that rely on hot water flow, such as boilers and showers. Consistently high pressure can strain pipes and lead to unexpected leaks or bursts.
8. The Importance of Testing Before Completion
Not testing plumbing systems before finishing walls or floors can lead to hidden leaks and costly repairs, particularly in a bathroom installation where multiple fixtures rely on proper sealing and drainage. Performing a pressure test or leak test before sealing walls ensures that all joints and connections are secure. Running water through all fixtures and drainage points before completing installation helps identify potential issues early and prevents expensive future problems. Taking the extra step to test can prevent major issues from arising later.
9. Installing Shut-Off Valves for Easy Maintenance
Without shut-off valves, isolating individual fixtures for maintenance or emergency repairs becomes difficult. Installing shut-off valves for sinks, toilets and other fixtures allows for easier repairs without disrupting the entire system. Quarter-turn ball valves offer better reliability and quicker access in case of emergencies. Ensuring each fixture has a shut-off valve simplifies long-term plumbing maintenance and prevents extensive water damage in case of a sudden leak. If you’re working on a bathroom project, installing shut-off valves for sinks, toilets and other fixtures allows for easier repairs without disrupting the entire system.
10. Preventing Pipe Movement and Water Hammer
Loose pipes can cause noise (water hammer) and wear over time, increasing the risk of leaks. Securing pipes using proper clamps and brackets while leaving room for expansion due to temperature changes prevents excessive movement. This is particularly important for systems like underfloor heating, where temperature fluctuations can cause pipes to expand and contract over time. Additionally, insulating pipes help reduce noise and prevent freezing in colder temperatures. Proper pipe support prevents excess stress on joints and extends the plumbing system’s lifespan.
Expert Plumbing Solutions in High Peaks and Macclesfield
For professional advice on all things plumbing installation in the High Peaks, Macclesfield, or surrounding areas, contact our expert team at HR Simply Bespoke today. We’ll ensure your system is efficient, safe, and compliant. Whether you’re a homeowner or a professional, careful planning and attention to detail are key to a successful installation. So follow this 10-step guide, and you can’t go wrong!
