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TECHNICAL
How do I fasten a toilet pan to the floor?
By
Patrick Gordon, technical manager, Splashworks
Installing a toilet on a concrete floor is often seen as a difficult task, but in reality, it’ s quite straightforward when approached methodically.
Professional plumbers follow a clear process that ensures the toilet is secure, level and properly sealed against leaks. Understanding not just how to do it, but why each step matters, can make all the difference in achieving a longlasting installation.
The toilet is then removed so that holes can be drilled into the concrete floor. A masonry drill bit is used to create clean, accurate holes at the marked points. Wall plugs or concrete anchors are inserted into these holes, forming the foundation for a strong mechanical fixing that will hold the toilet securely in place.
The process begins with proper preparation. The concrete floor must be clean, dry and level, as any unevenness can lead to instability later on. At the same time, the waste( or soil) pipe should be correctly positioned – either flush with the floor or slightly below it. This alignment is critical because it ensures that the toilet will connect properly to the drainage system without strain or gaps.
Once the area is prepared, the toilet pan is placed loosely over the outlet to check alignment. This step is about precision rather than fixing anything in place. The toilet should sit squarely against the wall and rest evenly on the floor. Using a spirit level helps confirm this. When everything is aligned, the fixing holes at the base of the toilet are marked on the concrete, creating a guide for the next step.
Before setting the toilet permanently, a proper seal must be installed. This is typically a wax ring or a rubber seal fitted onto the outlet pipe. Although it may seem like a small detail, this component is essential – it creates a watertight and airtight connection between the toilet and the drain, preventing leaks and unpleasant odours.
With the seal in place, the toilet can be carefully lowered onto the waste pipe and aligned with the drilled holes. Gentle downward pressure ensures the pan sits firmly onto the seal. Bolts or screws are then inserted through the base and tightened into the anchors. It’ s important to tighten them evenly and avoid excessive force, as overtightening can crack the ceramic base.
www. plumbingafrica. co. za @ plumbingonline @ plumbingonline @ PlumbingAfricaOnline July 2026 Volume 32 I Number 05