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TOPIC: Dishwasher drain hookup

Dishwasher drain hookup 9 years 4 months ago #34237

  • Bert de Haan
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The way I understand it, the dishwasher drain should discharge through an air gap and into the sink tail piece, not after the P-trap.  I have never yet seen a dishwasher drain through an air gap above the rim;  possibly this is not a requirement here.  I do see mechanical vents installed in dishwasher drains.  I have heard that the newer dishwashers have anti back-flow/siphoning provision built in.  This would maybe take care of the need to drain through an air gap.  But what about a dishwasher drain that is connected downstream of the P-trap;  would the provision that is built in the dishwasher also prevent sewer gas from entering the dishwasher?  I have called it out a few times but I am starting to wonder if I am correct in that. 

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Bert de Haan
www.KitchenerWaterlooHomeInspector.ca
Benchmark Home Inspection Services Kitchener-Wateroo and Guelph area Home Inspection
Serving Kitchener-Waterloo, Guelph, Orangeville, Mount Forest and surrounding areas.
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Re: Dishwasher drain hookup 9 years 4 months ago #34251

Maybe these simple illustrations can help.

Keep calling it out!!
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Re: Dishwasher drain hookup 9 years 4 months ago #34258

David:

Thanks for the images. This just came up the other day and the images would have made it easier to explain.

John

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John M. Hetz
IN Home Inspection, Inc.
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Re: Dishwasher drain hookup 9 years 3 months ago #34270

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Thanks David.  I attached what I had written down but it isn't sent away yet.  Maybe my wording is a bit to tentative. 
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Bert de Haan
www.KitchenerWaterlooHomeInspector.ca
Benchmark Home Inspection Services Kitchener-Wateroo and Guelph area Home Inspection
Serving Kitchener-Waterloo, Guelph, Orangeville, Mount Forest and surrounding areas.
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Re: Dishwasher drain hookup 9 years 3 months ago #34373

David, nice images as they say a picture is worth a thousand words

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I've Been Rich and I've Been Poor "Rich" is Better
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Re: Dishwasher drain hookup 9 years 3 months ago #34375

Thanks Gary, it does help the client, agent to understand what a high loop does, is.

Pictures and illustrations in a report are important for understanding the condition of the home.

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