I almost face palmed and threw the guy out when he told me to closed the valve half way. Worst part is if I was completely uneducated and blindly trusted this guy with all his "certs" I'd be worse off.
I think I can tackle this myself. Or maybe bring somebody in and say "this is exactly what I want done" ... just cause it's cold and there's no room for any learning woes.
My issue is theres no clearance between the last riser and the vertical drop for the main. I think I can just repipe to come back horizontal and add the vent. Would that work or is any vertical drop an issue?