Rousifier
New Member
The following was brazenly stolen from another forum and relates to a trap arm that has to angle down over an obstruction, with proper slope before and after the transition.
Question on another forum:I know that a toilet waste line needs to follow a 1/4"/ft slope so the liquids and solids don't separate leaving the solids to , well, solidify. Thing is - There's an area in my job where I need to run a drop about a foot long on a 45 degree slope. Will this "rapids" of a drop cause problems either with performance or inspection?
Reply: Go ahead and use two 45's to make your offset - it's a steep enough drop that nothing will get left behind. In addition, if it ever plugs up downstream of the offset, it'll be much easier running a sewer rod through the two 45's than through two 90's. If you want to go steeper than 45º but not as steep as 90º , you could also use a pair of 1/6 bends - they'll give you a 60º slope.
Would appreciate any comments or advice. I can angle around the obstruction with 135 degrees of re-routing using a long sweep '90', but if the 'fall' is permitted, it will give a straight shot from toilet to existing drain pipe. Wouldn't that make any future cleanouts much more effective and easier, since the toilet siphon (internal p-trap and cleanout), are available in the event of a clog? Does the rapid change in height effectively ruin the trap arm or make it more likely to siphon a shower p-trap downstream from the vent?
Question on another forum:I know that a toilet waste line needs to follow a 1/4"/ft slope so the liquids and solids don't separate leaving the solids to , well, solidify. Thing is - There's an area in my job where I need to run a drop about a foot long on a 45 degree slope. Will this "rapids" of a drop cause problems either with performance or inspection?
Reply: Go ahead and use two 45's to make your offset - it's a steep enough drop that nothing will get left behind. In addition, if it ever plugs up downstream of the offset, it'll be much easier running a sewer rod through the two 45's than through two 90's. If you want to go steeper than 45º but not as steep as 90º , you could also use a pair of 1/6 bends - they'll give you a 60º slope.
Would appreciate any comments or advice. I can angle around the obstruction with 135 degrees of re-routing using a long sweep '90', but if the 'fall' is permitted, it will give a straight shot from toilet to existing drain pipe. Wouldn't that make any future cleanouts much more effective and easier, since the toilet siphon (internal p-trap and cleanout), are available in the event of a clog? Does the rapid change in height effectively ruin the trap arm or make it more likely to siphon a shower p-trap downstream from the vent?