I was trying to find out about the current rules for suds relief and came across this which seems to render the suds relief rule obsolete (if you have a front-load machine).
As a note, the code does not apply in single-family residences and buildings with fewer than 3 floors of fixtures.
I wanted to share this in case someone was wondering.
IAPMO Plumbing Code Section 711-1: Suds Relief: Ever since the year 2000 all new washing machines and dishwashers come with front loading fixture doors which both require High Efficiency Detergents which produce no-suds. If they did the suds would become compressed inside the washing machine and dishwasher forcing the suds through the frontloading doors. This same section also lists kitchen sinks and bath tubs however they also use the new H.E. Detergents, but they could mandatorily use other soap items that could produce sudsing. This would also overflow the sink or bath tub. Very little suds would flow by gravity through the 1-1/2” size waste pipe to cause any real plumbing suds problems. Washing machines were the real problem with pumped water forcing the suds through a 2” waste pipe. Excessive labor & material costs for installing a Suds Relief Piping Systems in year 2020 Is no longer required. All the above sudsing information can be verified by all US manufacturers of detergents.
As a note, the code does not apply in single-family residences and buildings with fewer than 3 floors of fixtures.
I wanted to share this in case someone was wondering.
IAPMO Plumbing Code Section 711-1: Suds Relief: Ever since the year 2000 all new washing machines and dishwashers come with front loading fixture doors which both require High Efficiency Detergents which produce no-suds. If they did the suds would become compressed inside the washing machine and dishwasher forcing the suds through the frontloading doors. This same section also lists kitchen sinks and bath tubs however they also use the new H.E. Detergents, but they could mandatorily use other soap items that could produce sudsing. This would also overflow the sink or bath tub. Very little suds would flow by gravity through the 1-1/2” size waste pipe to cause any real plumbing suds problems. Washing machines were the real problem with pumped water forcing the suds through a 2” waste pipe. Excessive labor & material costs for installing a Suds Relief Piping Systems in year 2020 Is no longer required. All the above sudsing information can be verified by all US manufacturers of detergents.
