SOIL PIPE INSTALL – HOW TO CALCULATE FALL GRADIENT

This video will tell you how to calculate the fall and gradient of your soil pipe going to the soil stack. This is MY way of doing it, and everyone has their own way so tweak it if need be. I’ll show you how to install the pipe clips, measure the drop of the run (or going as we call it) and how to test that the soil stack has an adequate drop to the stack.

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Comment (0)

  1. This is great I have been pointing out to some residents that water does not flow upstream as the had renter plumbers in so I will send them this video, I didn't want to tell them my profession as it always leads to "can you" and the answer is no no no! I did tell the renter plumbers pls get the fall correct well that fell on deaf ears! and guess what, you guessed it we are getting regular blockages, they are now getting a "recommended Plumber" in to start all over again. shit happens.

  2. Alright James. Any chance of doing a video of how to connect 110mm pvc soil pipe to a cast iron soil stack? I need to cut a section out of a cast iron stack to insert a Tee to join a 110mm PVC pipe from another toilet. I cant replace the whole cast iron stack with PVC so need to cut the fitting into it somehow. Any suggestions on fittings would be cool too. Cheers

  3. Hi, If I have a horizontal 70cm length pipe straight from the pan spigot at 1:25 and then a 92.5° bend followed by a 1m pipe falling at about 1:40-ish (maybe 1:35-ish) to the stack will the water run too fast to carry the waste, especially over the 70cm section or will I get away with it?

  4. After watching this I went and checked mine. It's 160cm long and the fall is 35cm! Been like that past 40 years! Is that too steep? I've never had any issues

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