Are check valves required in this situation?

chell123

Hello;

I have a house and I'm in the process of having an ADU (mother-in-law apt) added to the basement. Things are taking way more time and costing more than I thought but it is coming along. However, I have a question in regards to plumbing.

I'm arranging the plumbing in such a way that I can add sub-metering in the future. I figured out how to seperate the lines before the (future) sub-meter and I am satisfied with that.

The problem is that there will only be one washing maching the house. To keep going with the sub-metering idea, I'd like to put in a pair of valves (hot and cold) on the ADU side and a pair of valves on the House side. The output from those valves would then go to a pair of Tees and thence to the washing machine hoses.

The question is, should I put check valves between the Tees and the valves? Am I required to do so under the UPC?

Sincerely;
Michelle

TarheelTerp

You plan to sub-meter the water in a MIL apartment?
Water must be very expensive out there.

Split or Tee as needed to isolate the pipes service the MIL area from the rest of the house... but do that in a spot it will later be practical to get to.
If/when you ever install a meter... deal with that days plumbing project then.