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Collecting and discharging wastewater is not always easy, especially when modifying the internal network. Everything is conditioned by the evacuation column on which a "stitching" is often necessary.

Text and photos C. PetitJean

Practical advice

The collage must be perfectly successful. To ensure the best chance of success, use a special rigid PVC glue, new or very recent because these products thicken over time and lose effectiveness. To drill the hole in the main pipe, use a good quality hole saw or drill bit. Turn slowly, making sure that the hole does not become flat.

Drain and sewage collector

It was the creation of a large shower and a sink, both of which evacuated on a Ø 50 mm pipe, which required the connection of a drain to the general sewage collector. How to join the existing column?

Choice of connection method

The routing of the drain pipes is not a concern. It is a vertical column crossing each floor to open into a corner of the cellar. The main idea was to get the plumbing down from the bathroom low enough to pierce the wall of the cellar and join the horizontal pipe of the garden, which conveys the sewage (and sewage) to the all-water pit. This option requires cutting the horizontal pipe to insert a small look into which the drain pipe of the bathroom pours. Technically valuable and often exploited, this solution imposes big jobs that it is better to avoid.

● A second option is easier to implement: connect the drain pipe of the bathroom to the evacuation of Ø 100 mm from the toilet. This operation is possible and legal since all the waters, except rainfalls can be dumped into the pit.

The saddle connection

Slightly sloping at the level of the cellar, the pipe of the toilet is poured into a vertical column via a large fitting "crowbar". All these elements are in PVC Ø 100 mm. Cutting one of these pipes to attach a fitting allowing entry is an operation virtually impossible to achieve. For a simple reason: pipes and fittings have been permanently assembled with particularly powerful PVC glue connections.

● Fortunately, a stitching is always possible, using a PVC element called "saddle connection" that is found in the trade. His pose however requires careful implementation to avoid, ultimately, leaks difficult to eliminate.

● This element is an open shell with a side entrance. The laying is done by gluing on the side of the main pipe after piercing it to a calibrated diameter. The saddle entrance is reduced (Ø 32, 40, 50 mm) in relation to the diameter of the pipe on which it is laid (80,100 mm or more).

Make the connection

The final connection is made by installing the saddle on the Ø 100 mm pipe near the cellar ceiling, and connecting it to the bathroom drain with a set of tubes, elbows and presser foot (all Ø 50 mm). All elements must be cut, adjusted, marked and blank before final gluing.

Collector pipe and evacuation pipe

Collector pipe and evacuation pipe

The Ø 50 mm pipe (on the right) collects the water from the shower and washbasin. It opens in the cellar. It will be connected to the almost horizontal evacuation pipe of the toilet.

Place the saddle

Place the saddle

A saddle connection makes this operation possible. Choose its position so that the alignment is correct. Draw around the room and the outline of the central hole.

Drill the central hole

Drill the central hole

Equip the hole saw with a Ø 44 mm blade and point the centering drill to the mark. Turn at low speed to avoid ovalizing the hole. Eliminate the burrs with the half-wave file.

Sand, paste, assemble

Sand, paste, assemble

Sand the saddle location and its interior with abrasive 150. Place on either side two Serflex collars. Place the glue on both sides and assemble immediately.

Tighten the collars

Tighten the collars

Move the two clamps closer together and tighten with the wrench, more effective than a screwdriver. On some saddles like this, two legs can be joined by a wire for tightening.

Assemble presser foot, sleeve and bypass tee

Assemble presser foot, sleeve and bypass tee

The presser foot is assembled at the entrance of the saddle by a straight sleeve, a bypass tee and two 45° male / female elbows. Mark each adjacent room to be glued.

Paste

Paste

Apply the PVC glue on each part and assemble making the marks coincide. The blocked plug in Ø 32 mm will be used later to empty a sink.

Fix the parts

Fix the parts

The relative position of the two elbows made it possible to join exactly the entrance. Glue the presser foot and saddle interlock. Then glue a plug at the end of the presser foot.


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