Plumbing is one of the most important parts of a home, yet it’s also one of the most neglected. Many homeowners in Nepal face recurring issues like pipe leaks, low water pressure, rust in water, or even burst pipes. These problems may look small at first, but over time, they lead to higher repair costs, water waste, and serious damage to walls and floors.

Most of these issues come from one main cause: using the wrong plumbing fittings and materials. This article explains the top 10 plumbing mistakes commonly made in Nepali homes and shows how choosing the right fittings from Dolphin Polyplast Pvt. Ltd. can prevent these problems.
 

Why Good Plumbing Matters in Every Home?

Plumbing is not just about getting water to flow through pipes. It directly affects your family’s health, comfort, and safety. When plumbing is done properly with the right fittings, water reaches all taps smoothly, pressure remains stable, and contamination is avoided.

On the other hand, poor-quality fittings and incorrect installations can cause leaks, mould growth, and rust in water, making your home unhealthy and costly to maintain. So, investing in quality plumbing materials from the start is always a smart decision.

Mistake 1: Using Low-Quality Pipes and Fittings

Problem

Many Nepali homeowners choose cheaper pipes and fittings from local stores, thinking they’re saving money. However, these low-cost materials are often made from poor-quality plastic or recycled materials. Over time, they crack, corrode, or become weak due to temperature changes.

For example, in many homes in Kathmandu, small leaks start appearing just one or two years after installation. These leaks often happen behind walls, which are expensive to fix later.

Solution

Using high-quality fittings from Dolphin Poly Plast prevents such problems. Dolphin’s CPVC, UPVC, and PPR pipes are strong, leak-proof, and long-lasting. They are tested to resist both hot and cold water, making them ideal for the diverse weather conditions in Nepal. Investing in good fittings once saves you from repeated repair costs later.
 

Mistake 2: Using the Wrong Type of Pipe for Hot and Cold Water

Problem

One of the biggest mistakes made during construction is using the same type of pipe for both hot and cold water. Many plumbers still use normal PVC pipes for all purposes. However, PVC pipes are not made to handle hot water. When used for geysers or solar water heaters, they soften and crack over time. This is why you may notice warm water leaking from bathroom walls or behind tiles in some homes.
 

Solution

For hot water lines, always use CPVC pipes. CPVC (Chlorinated Polyvinyl Chloride) can handle temperatures up to 93°C, which is perfect for water heaters and solar systems. Dolphin Poly Plast’s CPVC pipes and fittings are specially designed to handle both high temperature and high pressure, making them safe and durable for Nepali homes.

Mistake 3: Poor Jointing and Connection Practices

Problem

Even with good materials, poor installation can ruin the entire plumbing system. Some plumbers use too much adhesive or do not allow enough time for the adhesive to dry. This leads to weak joints that start leaking after a few months. In some cases, misalignment during installation creates pressure points that damage the pipe structure.
 

Solution

Proper jointing requires accurate fittings and precision-engineered connections. Dolphin Polyplast fittings are designed for a perfect fit, making installation easier and safer. They reduce the need for excess glue and ensure leak-proof connections when installed properly.
 

Mistake 4: Ignoring Water Pressure Differences

Problem

In multi-storey buildings, water pressure can vary greatly between floors. The ground floor may have high pressure, while the top floors may experience weak flow. Using the same type and size of pipe for the entire building causes pressure imbalance, which can eventually burst pipes on lower floors and result in low flow on higher ones.
 

Solution

Dolphin Polyplast manufactures pressure-rated pipes suitable for different water pressure levels. These pipes are tested to ensure that they can handle strong water flow without damage. Choosing the right pressure-rated pipe ensures balanced water supply across all floors and prevents pipe damage.
 

Mistake 5: Mixing Different Materials

Problem

In older homes or during small renovations, some people connect metal pipes with plastic ones. This combination seems harmless but causes a chemical reaction known as galvanic corrosion, which slowly damages both pipes and causes leaks or contamination in water.
 

Solution

Use one consistent material system for the entire plumbing line. Dolphin Poly Plast offers a complete range of fittings and accessories that work together perfectly. By using all Dolphin components, from pipes to joints to valves,  you ensure proper compatibility and long-term durability.

Mistake 6: Incorrect Pipe Sizing

Problem

Using the wrong pipe size is a common mistake. If the pipe is too small, it restricts water flow, causing weak pressure in taps and showers. If it is too large, it wastes pressure and increases material cost unnecessarily. Many homeowners or untrained plumbers estimate sizes without proper calculation, leading to long-term flow issues.
 

Solution

Here is a simple sizing guide for Nepali homes:

• For taps and bathroom fittings: ½ inch (15 mm)
• For main water supply lines: 1 inch (25 mm)
• For overhead tank connections: 1.5 inch (40 mm)

Consulting a professional plumber before installation ensures that the right pipe size is chosen based on the number of outlets and total water flow required.

Mistake 7: Not Providing Proper Pipe Support

Problem

Pipes must be supported with clips or brackets to prevent sagging. Without support, the pipe bends under its own weight or water pressure, which weakens the joints and creates vibration. Over time, this leads to cracks and water leakage.
 

Solution

Dolphin Polyplast provides strong pipe clamps and support fittings that keep pipes firmly in place. They prevent bending, reduce vibration, and make the plumbing system more stable, especially in multi-storey houses where long pipe runs are common.

Mistake 8: Not Planning for Future Expansion

Problem

Many homeowners install plumbing only for their current needs: one kitchen, one bathroom, and a water tank. Later, when they decide to add a new bathroom, washing area, or solar water system, they realize there is no space or connection point available. This forces them to break tiles, walls, or floors to extend pipelines, increasing cost and damage.
 

Solution

During construction, plan ahead. Dolphin Polyplast fittings are modular and easy to extend, allowing you to add new lines later without redoing the entire system. Installing a few extra connectors or end caps during initial plumbing gives flexibility for future upgrades without additional construction work.

Mistake 9: Poor Drainage System Design

Problem

In many Nepali homes, improper slope or wrong pipe connection in the drainage system leads to water backflow, blockages, or foul smells. This usually happens because pipes are not angled correctly or the wrong type of trap fitting is used near sinks and bathrooms.
 

Solution

Proper drainage requires pipes with the right diameter and slope. Dolphin’s PVC drainage fittings are smooth inside, allowing easy flow of wastewater without blockage. Their airtight seals prevent foul odours and backflow, keeping bathrooms and kitchens hygienic.

Mistake 10: Ignoring Professional Guidance

Problem

Some homeowners try to handle plumbing work on their own or hire untrained workers to save money. While this may seem cheaper initially, it often results in poor installation, leaks, and water pressure problems that cost much more later.
 

Solution

Always take advice from experienced plumbers and use certified plumbing materials. Dolphin Poly Plast not only provides top-quality products but also technical support and guidance for proper installation. This ensures your plumbing system performs efficiently and safely.

Among all types of plumbing materials, CPVC fittings are currently the most reliable choice for modern homes in Nepal. They are designed to handle both hot and cold water, are resistant to corrosion, and have a smooth inner surface that prevents scaling or clogging.

Conclusion

Most plumbing issues in Nepali homes can be avoided by using the right fittings and following correct installation methods. Small mistakes, such as using cheap pipes, mixing materials, or skipping professional advice can lead to big problems later.

By choosing Dolphin Polyplast Pvt. Ltd., you ensure that your home has a strong and reliable plumbing system. Dolphin’s CPVC, UPVC, and PPR fittings are tested for strength, temperature, and safety, making them suitable for both new constructions and renovations. Whether you are building a new home or upgrading an old one, investing in the right plumbing fittings from Dolphin means peace of mind, clean water, and a leak-free home for years to come.