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Now that's an interesting thought. The floor drain is located within 2 feet of the main stack (which vents to the roof), but has no separate vent for itself. I should probably have a look at the Illinois code and see what it has to say. Technically, I'm only changing the last few inches...

Thanks Jim, Yeah...I think I'll go for the 2" PVC which will make connection to the Kerdi drain easy. Still amazed that anyone would think a 4" pipe was necessary for a shower, unless you were bathing a baby buffalo or something like that.

Ah... "precast terrazzo"...so that's what it was (confirmation courtesy of Google). I did enjoy smashing it to pieces and I'm fairly certain the house was built with this pan. Amazing what they got away with back then. Per Terry's comment, I'll do this the "proper" way and use a 4" -> 2"...

Terry, Thanks for the quick response. I kind of feared this would involve busting up the concrete, but I'd rather do it right. Hopefully, it shouldn't be too painful.

I am currently remodeling a bathroom in my house and need some guidance on the shower drain. The house is located in Lake County, Illinois and was built in 1967. It is a “tri-level†and the shower is located on the lower level, on the concrete slab. The original shower tray was cast...