redo of newly installed kitchen sink and drain line

[Geolo85]

Contractor sub installed my new single kitchen sink and garbage disposal wrong. Sub had a "blank slate" with this reno as I made the dining room into a new kitchen. With water running, water fills to top of interior of garbage disposal and then disposal never fully drains once water is turned off. Contractor installed Oatey vent but not a fix. Now says has to change drain line to go through the floor (we have crawl space where drain ties into main drain) or says he can remove the exterior siding panel and cut lower hole at back of cabinet wall to re-run the drain line into the wall and down to the crawl space. Have uploaded pics if helpful. What would be best option(s)?

 

[Timmy D]

Either option really. Just need to get horizontal drain line after trap lower than the disposal outlet.

 

[Down-the-drain-86]

Crazy, was that the sub's first job ever? Maybe he lives in a world where drain water goes up. Anyway, what you want to have in your setup is something looking like this for the water to drain properly.