Anyone know about rough-in plumbing for dishwasher?


Old 05-09-18, 09:02 PM
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Anyone know about rough-in plumbing for dishwasher?

My old kitchen had a dishwasher that received its water supply from a line tee’d off of the hot water line supplying the kitchen faucet. When you opened the sink cabinet, you could see one single hot water line coming from the wall and into the cabinet, then the line tee’d off to supply hot water to both the faucet and the dishwasher.

I understand that plumbers now rough in the plumbing so that there is a dedicated line coming out of the stud cavity for both the faucet and dishwasher without the need for a tee inside the sink cabinet. Just wondering if this is really necessary. I’ve never heard of any new code that states that this is mandatory.

For the newer method used by some plumbers... regarding where the dishwasher’s hot water line comes out of the stud cavity, is the placement dictated by code? I’m just trying to figure out how many inches above or below the faucet line should the dishwasher line come out of the stud cavity.
Old 05-10-18, 06:19 AM
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No, the placement of rough plumbing is not stated by code. You will want to look at what your and most dishwashers require which is near the floor. Personally I like to have the dishwasher rough in in the adjoining cabinet as the connection and shutoff valve are accessible. If you put the rough in inside the dishwasher cavity the hose connection and turning the water on and off can only be done with the dishwasher removed which requires a really long hose and more time on your knees cursing.
Old 05-10-18, 07:15 AM
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I don't know about code but when I had mt kitchen down to studs I did a separate faucet for convenience. I can shut either off without bothering either sink or dishwasher.
Old 05-10-18, 08:06 AM
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Thanks guys. I definitely don’t want to put the water supply line for the dishwasher in the dishwasher cavity. That would make it annoyingly difficult to turn off the water for the dishwasher if the dishwasher needed servicing. I do plan on roughing in the dishwasher line in the adjacent cabinet, which is the sink cabinet.

When I do the rough in for the dishwasher supply line... If I place the dishwasher’s supply line approximately 6 inches below where the sink’s hot water line comes out of the wall, would this be adequate? And dumb question here, but the dishwasher is only supplied by a hot water line, correct?
Old 05-10-18, 09:57 AM
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And install a receptacle under the sink for a cord from the dishwasher. Lot easier then behind the DW or hard wiring it.
Old 05-10-18, 07:56 PM
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Hire a plumber

We run dedicated lines for the d.w so it gets 140 degree F aswell as the clothes washer. For obviouse reasons. Everything else gets 120. If you have a mixing valve an its taken off the water distribution line feeding the K.S then your D.W is getting 120F. You can put your water lines where ever your heart desiers in your cabinet. I rough mine in to look nice an proffesional....

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