Archive for the ‘Island Vent Rough In’ Category

Lets take a look at the isometric drawing of a “Special Vent System” plumbing installation!

What is an Isometric Drawing ?

What we have here is a rough in plumbing diagram of a Special plumbing Venting System. One of the typical venting lay out for island type kitchen sinks. Under the regulations of the Uniform Plumbing Code island venting (special vent system) will be acceptable.

For the Rough in of the Island Kitchen sink to work properly, and pass inspection all traps must be installed above the finish floor. The vent will need to extend as high as it can under the cabinet and/or drainboard, then return back down to connect to the horizontal waste pipe immediately downstream from the vertical plumbing waste pipe.

The return vent must be connected through a wye branch fitting. In addition to the connection through a wye-branch fitting there must be a foot vent installed. The foot vent will need to be taken off the vertical fixture vent by means of a wye-branch drainage fitting immediately below the floor and extending to the nearest wall partition. Then through the roof to open air, this vent may tie in to other vents at a point of 6″ above the highest fixture flood level rim served.

NOTE: All fittings below the floor must be Plumbing drainage fittings only.

The foot vent will need to have a 2% slope per foot back to the drain. The Return portion of the vent will need to be comprised of (1) piece fitting or an assembly of a 45 degree (1/8″ bend), a ninety degree (1/4″ bend) and a 45 degree (1/8″ bend) elbow in that specific order.The Plumbing diagram shows the correct UPC pipe sizes. (refer to rough in plumbing diagram)

The island sink drain, upstream of the returned vent, shall serve no other fixtures. An accessible cleanout will need to be installed in the vertical portion of the foot vent (see rough in plumbing diagram for location)

There is a spot for an optional cleanout on the return vent. The reason for this would be to make sure that if there is a draining issue and everything on the waste was checked that possibly there may be an obstruction in the wye branch for the vent and this cleanout would be perfect to camera and/or snake out. Remember that this is optional, it is noted on the rough in plumbing diagram.

Always check with your local plumbing inspector, plumbing official or the plumbing administrative authority before attempting a rough in plumbing diagram to make sure that you have the right tools to get the job done the first time!

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