How to Move the Toilet Water Pipe

The main methods for moving toilet water pipes include altering the position of the original toilet's drainage pipe, using a toilet offset flange, and cutting the sewage pipe.

Altering the Position of the Original Toilet's Drainage Pipe

First, determine and mark the new location for the toilet. Check if the new position allows the drainage pipe to connect to the main drainage stack. Then, drill a hole in the floor, typically using a 150mm diameter core drill, although this method can damage rebar and is not recommended lightly. The hole size should be one size larger than the outer diameter of the drainage pipe. Next, dismantle and install the toilet drainage pipe. Remove the original drainage pipe at the tee joint of the main drainage stack and install a new drainage pipe, such as a PVC pipe, using a wide enough clamp to prevent leaks. After that, fill and seal the hole, hang a formwork below the floor slab, pour concrete, and apply reliable waterproofing, typically using polymer cement mortar waterproof coating, after the concrete has set. Finally, decorate the floor and install the toilet, placing the toilet at the new drainage pipe location after laying the floor tiles. Note that this method requires negotiation and consent from the downstairs occupants before implementation.

Using a Toilet Offset Flange

This method is suitable for short-distance offsets within 40 centimeters. Recommended tools include a specialized flat offset flange or round pipe. During operation, maintain a slope of 1%-2% and minimize the number of bends to effectively prevent blockages.

Cutting the Sewage Pipe

First, cut the sewage pipe to remove the excess portion, then fit a sealing ring, measure the length accurately, apply glue evenly, and ensure the seal and stability of the connection.