Should I tie a new dishwasher drain hose to an unused 1.5" drain stub or to the kitchen sink drain?

[Golden_Days_Pete]

This is what your installation will likely look like. The blue line is the trap water level. The upward slope of your trap arm will retain water and will be part of your water trap. If the dimensions of your slopes per foot are like 1/4" or 3/8", and it has been this way for 10-20 years, you likely won't have any problems unless you use the corrugated line as a P-trap.

That was helpful. I want to thank you and everyone else who commented on this thread. I got the dishwasher installed a few hours before my sister arrived for a 5-day vacation visit, and she and I were very thankful to not have a big dishwasher in the middle of the kitchen. If any homeowners reading this have not yet contributed monetarily to this forum, I encourage you to do so out of fairness to the forum and the plumbers who provide advice.

The only thing remaining is that I've had to order a special part to stabilize the dishwasher because my counter is granite (so the brackets can't be screwed into it) and the cabinets are recessed and the dishwasher sides don't have any holes or punchouts for screwing into recessed cabinets, so I ordered this part that attaches to my cabinets and runs across the top of the dishwasher, then the brackets are attached vertically to the new part. Have you or anyone else used this kind of part before and if yes, is there any advice for using it: https://www.amazon.com/dp/B097BTWGFQ?psc=1&ref=ppx_yo2ov_dt_b_product_details

 

[Mitchell-DIY-Guy]

I’ve seen that part used. Actually have had to remove two of them. Frankly it’s a “make-do” kind of thing. Most new construction even on less costly homes have solid surface counters (granite or quartz, etc.) and have for many years. It’s the dishwasher manufacturers that haven’t adapted to the times. Cabinets have been wood forever and most dishwasher manufacturers apparently didn’t get the memo. I’ve installed Bosch and Miele dishwashers and they have holes for left and right side mounting into cabinet frames. An older LG I worked on used essentially the same top mount brackets but on the side.

There’s just some short sheet metal screws you need with that bracket…and you need to wedge it into place,

 

[Twowaxhack]

That was helpful. I want to thank you and everyone else who commented on this thread. I got the dishwasher installed a few hours before my sister arrived for a 5-day vacation visit, and she and I were very thankful to not have a big dishwasher in the middle of the kitchen. If any homeowners reading this have not yet contributed monetarily to this forum, I encourage you to do so out of fairness to the forum and the plumbers who provide advice.

The only thing remaining is that I've had to order a special part to stabilize the dishwasher because my counter is granite (so the brackets can't be screwed into it) and the cabinets are recessed and the dishwasher sides don't have any holes or punchouts for screwing into recessed cabinets, so I ordered this part that attaches to my cabinets and runs across the top of the dishwasher, then the brackets are attached vertically to the new part. Have you or anyone else used this kind of part before and if yes, is there any advice for using it: https://www.amazon.com/dp/B097BTWGFQ?psc=1&ref=ppx_yo2ov_dt_b_product_details

Yes, it’s what most stone installers in my area are using now.

I’ve also epoxied a 1/2” plywood strip to the under side of the stone and used cheap $1 clamps from harbor freight to hold it overnight and just let the customer keep the clamps. They’re probably $5 each now.,….still cheaper than a second trip for me to come back.

 

[chinarus]

I have used the composite door shims (cut to length and stack if necessary) in conjunction with
the front feet adjustment. Epoxy to bottom side of the granite can help.

Rubber/plastic Furniture levelers could potentially work as well.

 

[Golden_Days_Pete]

The special part worked great. If I were in the same situation again, I might go with the idea Twowax said of epoxying plywood to the bottom of the counter, then screwing into that. Anyway, I'm thankful for this forum and happy to be a part of it. Thanks to everyone who gives advice. For anyone like me who's receiving advice and doesn't know enough to really share back, please make at least a small donation to the forum.