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I have read that using galvanized metal strapping to support ABS is at best unprofessional, and at worst against code. Unfortunately, alternatives seem to be lacking. Plastic J-hooks seem to only be available at professional plumbing suppliers. The big boxes sell nothing but galvanized metal...

Installing a toilet in a joist bay, so space is limited. I would ideally use a spigot closet bend (like this: https://www.homedepot.com/p/4-in-x-...got-x-Hub-Closet-Elbow-C58072CLHD43/100343148) , cut down to level, and add a 4" hub flange. Unfortunately, up in Canada for some reason I cannot...

Gaa, you are right. That was all the big-box stocked. Looks like ideally I would go for a fitting specifically designed for cast to plastic - https://www.fernco.ca/sites/default/files/dimensional-drawings/pdf/3000-44.pdf No idea where I could buy one though. Home Depot also stocks this...

I'm doing an ABS to cast transition. 4" cast connected to a 4" to 3" ABS bushing. The bushing has a spigot end that should be identical diameter to 4" ABS pipe, so I figured a regular hubless 4" shielded coupling would work. (I used this one: https://www.americanvalve.com/product/rnhhd/)...

I don't think you are wrong. But if I dry vent each main floor fixture up through the walls, reconnecting with the stack in the attic, haven't I essentially turned that main stack vent into a soil stack, that can be used as a waste drain for the upper unit? I only ask because it might be that...

Thanks for your helpful replies. Wouldn't option 3 technically be the best? Not only would I not be interfering with lower fixture venting - but I would actually be properly venting them, which they are not now (ie I would essentially be creating a bypass vent around the section of the main...

Assuming I can fix the larger issue above... I thought I needed a 3" branch because bathroom + clothes washer = 9 DFU (per: https://www.engineeringtoolbox.com/drainage-fixture-unit-values-d_1077.html) And I thought the max DFU for a 2" horizontal branch was 6 DFU (per...

I was worried this might be an issue. Here's the story. This is a 100+ y/o duplex, with kitchen and bathroom on both levels. Most of the drains have been upgraded from cast iron to pvc by previous owner. None of it was vented properly - it all drains direct to the main stack (which I assume...

I am designing a new bathroom + kitchen sink on a second story. Will need to tie everything into the 4" stack. Could you take a look and let me know if my idea makes sense? There a section of "wet" vent, where I have a kitchen sink draining above where the toilet discharges. Is that okay...