Drainage System

Without a vent, when you flush the toilet the line will be filled with water and cause the toilet to suck air until the slug of water has passed another location where it can draw air. If the floor drain is close by, it will gurgle as the slug of water draws air behind it after passing the drain.

The problem you will have is that your p-trap and the toilet may not have sufficient water to prevent sewer gasses from getting into your structure. Aside from the foul smell this could be a health and safety hazard.

Your solution could be to install a vacuum vent, I think they are called a studor vent in some places. This device allows the pipe to draw air from the room but is spring loaded (or weighted) and prevents air from the pipe to enter the room.

Drew K

_{P.S. many people in the forum discourages anonymous posters...}

Isn't this pretty much what I said?

Drew K

For too much crack, there is always Crack Spackle

You are saying 'Lavatory' which means a wash-hand basin or something like that, which is normally connected to drain with the floor drain. This has nothing to do with the Toilet seat as such.

If this is clear, then your plumber is right IF the floor drain is connected to the drain pipe which must have a vent pipe of its own. Usually, the floor drain will have a trap built in which will prevent smelly gases to come into the room.

If the 'Lavatory' is connected to the floor drain and a vent pipe directly to it, you might have some smelly gases coming in if that vent pipe joins the main drain vent pipe!!!

Suspect it's just a nomenclature thing, and that OP is talking about a WC. Nice to have it confirmed, tho'.

I hopr he will confirm what it is exactly because, if it is the WC being connected to the floor drain, then this plumber must be nuts! Never mind the venting problem!

A plumber is always ONLY a plumber. He/She cannot become a Plumbing Engineer.

There's no such thing as:

• A Plumbing Engineer
• A Heating Engineer
• A Photocopier Engineer

I just added M&E before Plumbing engineer.Is it OK?

It is almost impossible to answer this question without a diagram of the plumbing system. There are many possible methods of venting. The mention of mechanical vents: again check local codes as not all allow such.

Again, hire a qualified contractor not a friend of a friend.

Lykke Til

Yar

you paid cash, right? you got burned

Not sure where you live, but the Australian Standard AS 3500.2.1 - 1996 (National Plumbing & Drainage, Part 2.1 Sanitary plumbing and drainage - Performance requirements) states:

'7.2 Sanitary drainage system A sanitary drainage system using waterborne waste

disposal shall be designed and constructed to-

(a) convey sewage from a sanitary plumbing system to an approved disposal system;

(b) avoid the likelihood of blockage and leakage;

(c) ensure the system is supported, jointed and protected in a way that will avoid the

likelihood of penetration of roots or the entry of ground water;

(d) provide access for maintenance and for clearing blockages;

(e) be ventilated to avoid foul air and gases accumulating in the sanitary drainage

system;

(f) avoid the likelihood of damage from superimposed loads or normal ground

movement;

(g) protect against internal contamination;

(h) prevent stormwater entering the sewerage system;

(i) avoid the likelihood of damage to existing buildings or siteworks; and

(j) avoid damage to the sewerage system, where applicable.'

Or look up AS/NZ3500.5:2012 Section 4.34: Venting of Drains.

Find a free copy here: http://www.gobookee.org/as3500-plumbing-standards/

Good luck.

CS