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Minimum drain line size for a double bathroom sink vanity.
I am replacing a single sink vanity with a double sink. The current drain line in the crawl space is 1 1/2". This line empties into a 3" line after about 10 feet and has a drop of over 6". I would like to use all 1 1/2" lines in the wall and connect to the 1 1/2" line to drain for both sinks. It would be very difficult to replace the 1 1/2 " line with a 2" line because of crawl space height restrictions. Will 1 1/2" lines do the job? I've included a rough diagram.
Vessel Sink Rough-in Drain Height
I'm installing my first vessel sinks and it is now time to rough-in the drain. Normally I would rough-in the drain at 18" to 22". The cabinet height is 34 1/2 inches. The pop-up drain will extend below the countertop 6" inches making it 28 1/2" off the finished floor. I'm trying not to use a tailpipe extension, but with a 1 1/4" p-trap you only have about 1 1/2 inches to make the vertical adjustment. I'm thinking I should just go at least 10" below the countertop (making the drain a maximum of 24 1/2" off the finished floor and use a tailpipe extension. Any suggestions would be appreciated.