Can vent plumbing be behind a double wye?

Question

I am trying to figure out how to lay out my basement plumbing, and I wanted to use a double wye to connect my shower, toilet, and sink to the existing waste system in the house.

My question is, am I allowed to have the vent plumbing be behind a double wye since all 3 fixtures combine at this one point? Or am I required to have each fixture individually vented and then join the vents later into one common vent?

All of this work will be under the concrete slab. I am connecting to the existing waste system that runs under the concrete slab.

The existing waste system is connected to all the fixtures on the 1st floor (toilet, tub, sink, kitchen sink) of the house and then travels down into the basement, under the slab, and out to the road. This system is vented through the ceiling.

I should probably also ask if I even need to vent this new basement bathroom separately, or if the current venting system would be sufficient.

Picture: http://i.stack.imgur.com/QWBW1.png

rockntaz · Answer

u CAN vent behind the wye BUT u have to make sure ur vent goes up at a 45 and then 45 back to horizontal and remains above the drain line.....Also have top have the vents within certain feet from each fixture....if u run a 2" drain from your shower which is code then u can run about 10 linear feet before having to vent it seperately...now that mean u have to measure from the shower base down and thru the trap and to ur tie in and it cant exceed 10'...ur toilet will also have to be vented but if u have a wall close to the tub and toilet then u can use one 3" vent and use that for both as long as they r close enough...Also it is best if possible NOT to have any dry vents..meaning if u vent the toilet then try to tie the tub or sink into that line so it will be a wet vent...when u tie ur vent in the wye remember to turn the line (vent ) up at a 45 then level back out to get the vent higher than the drain..and the vent will have to raise to its destination vs. the drain falling to its destination and when venting u put the fittings in backwards since the air will be flowing opposite of the water

Can vent plumbing be behind a double wye?

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