Need Plumbing help in basement!

a1homes

hi

thanks for the great website, I am a real estate agent, and know little bit about plumbing and the structure,
recently I have started to finish my basement which was partially finished, I have designed the basement model and drain lines on the computer.
If you get chance to look at it please and advice,
and also should I remove the old lines when installing new ones or leave it there if they don't conflict with the new ones.

*please check attached picture for diagram, thanks

Attached Thumbnails

 

jogr

Whats old and why don't you want to use it? I would direct drains on the shortest route to the main line. Use 3" from the toilet not 4" if your main is 3".

a1homes

thanks for the reply,
the old lines meaning, i had washroom installed but I wanted to move everything according to my new plan so i can fit the laundry in.
sure i will use 3" if the drain is 3".. good point...

any other suggestion?

jogr

I know what old lines are. What I want to which one of the pictured lines are the old work and which are the proposed new lines.

a1homes

picture attached for new lines

Attached Thumbnails

 

jogr

All those are new? Way too complicated. 2" drain line for the floor drains. Direct the drains for the sink, washer and floor drain (by the washer) on the shortest path (1 to3 ft long ) directly into the main (or into a short 3" line off the main between the sink and washing machine). The rest looks ok. Might need a vent for the floor drains.