Your Home's Plumbing: 5 "Buried" Mistakes That Cause Leaks and Bad Odors (And How to Avoid Them)

Did you know that 70% of building problems in Saudi Arabia are caused by "Plumbing"?
Many focus on the beauty of tiles and paint, forgetting that what lies beneath (plumbing pipes) is a ticking time bomb if not executed correctly. A simple leak might force you to demolish a bathroom that cost 50,000 SAR to fix a pipe worth 10 SAR!

At True Draft, today we reveal the fatal mistakes that the "cheap plumber" falls into, and how to protect yourself from them.

1. Not Conducting "Pressure Test" (The Major Disaster)

Mistake #1: The plumber finishes installing pipes, then the tiler comes and buries them immediately.
Correct: A "Pressure Test" must be conducted using a special pump that pressurizes water inside the pipes at high force for 24-48 hours. If the indicator drops even slightly, it means there is a hidden leak in the joints that must be fixed before laying a single tile. At True Draft, we do not allow the tiler to enter until the pressure certificate is received.

2. The Mystery of "Bad Odors" (The P-Trap)

Have you entered a very luxurious bathroom but the smell of "sewage" is unbearable? The reason is not cleanliness, but drainage engineering.
The mistake is not installing a "P-Trap" or "U-Trap" correctly under the toilet, sinks, and floor drains. The function of this trap is to hold a quantity of water that prevents sewage gases from returning into the bathroom.

3. Pipe Slope: Physics Has No Mercy

Water doesn't walk in horizontal pipes alone; it needs gravity.

• Mistake: Installing drainage pipes completely level (Zero Slope). Result? Water stagnates, dirt accumulates, and permanent blockage occurs.
• Correct: There must be a slope of 1-2 cm per linear meter to ensure water flow and waste removal smoothly.

4. Waterproofing (The Final Shield)

Even with the best plumbing, a leak might occur in the future. Here comes the role of floor waterproofing (before tiling).
The common mistake is relying on "Grout" between tiles to prevent water. Grout erodes over time, and if there isn't strong insulation underneath (like bitumen or cementitious insulation) with an upstand on the walls, water will reach the ceiling steel and rust, and moisture will appear in the ceiling of the floor below.

5. Mixing Pipes (Hot and Cold)

Using pipes dedicated to cold water only in hot water lines (heater) is a fatal saving. Heat will cause the pipe to expand and crack within months.
True Draft Tip: Always use certified, high-thickness thermal pipes (green) for all lines to ensure peace of mind. The difference in cost is negligible compared to the cost of repair.

Conclusion

Plumbing is the "arteries" of the home. Its blockage or bursting means the clinical death of the home.
Don't look for the "cheapest plumber", but look for "best materials" and "most precise tests".

Want to sleep soundly?
In True Draft projects, we apply the Saudi Building Code strictly in plumbing, and we document pressure and insulation tests by video to hand you a 100% (dry) and healthy home.