basin waste

[jonnyp1]

might5 be astupid question but trying this for first time, can i run the waste pipe from the basin and join waste pipe for shower, then can i join both these to waste of sink below, or should i run them all seperately to the main soil pipe, also what is fall required for waste pipe?
cheers

 

[B&Qsuck]

I would personally have a 2" waste pipe connected to soil stack and running to last waste. Then use swept tee's into the 2" from other wastes... No problem there, obviously the 2" would need a drop, sure someone will be along to tell you what the ratio is... mind has gone blank!!! That's flu for you