Standpipe Maximum Height

[Jim Katen]

UPC, Section 804.1 says:
No trap for any clothes washer standpipe receptor shall be installed below the floor, but shall be roughed in not less than six inches and not more than eighteen inches above the floor.

Why do you suppose there's a maximum height of 18 inches?

Washing machine manufacturers all (nearly all?) allow their washers to be installed with standpipes up to 96 inches above the bottom of the washer. With a 30-inch standpipe, that would put the trap about 66 inches above the floor.

If it's ok with the manufacturers, what problem is the UPC trying to address?

I'm thinking of basements where the sewer line might exit the basement at three or four feet above the floor.

 

[r.g.]

UPC, Section 804.1 says:
No trap for any clothes washer standpipe receptor shall be installed below the floor, but shall be roughed in not less than six inches and not more than eighteen inches above the floor.

Why do you suppose there's a maximum height of 18 inches?

Washing machine manufacturers all (nearly all?) allow their washers to be installed with standpipes up to 96 inches above the bottom of the washer. With a 30-inch standpipe, that would put the trap about 66 inches above the floor.

If it's ok with the manufacturers, what problem is the UPC trying to address?

I'm thinking of basements where the sewer line might exit the basement at three or four feet above the floor.

 

[Sponsor]

 

[r.g.]

A washing machine is a cross connection between potable water and DWV. The standpipe must have a minimum of a 1" airgap between it and the flood level of the fixture. Is it still hidden in the UPC that any fixture that has an indirect waste may not tie the vent into any other vent? Like a washing machine,dishwasher? Few knew of that. So one sees K.S. vents tied in to other vents when the K.S. has a dishwasher