DIYbanter - View Single Post - Do I need to vent a walk in shower that is replacing a tub/shower combo?

Speedy Jim

wrote:

SNIP

Great feedback Jim thanks. Maybe you (or someone else) can help
answer this follow up. Why is 1.5" good enough for the drain pipe
when it's a combo tub/shower, but a 2" is required when it's a
dedicated shower? It seems as if a 1.5" is good enough in the first
scenario it should work in the second. Is this just an overly
conservative code issue?

HaHa! My opinion is it's overly conservative.
Either that or, maybe, 1 1/2" was always too small...

Jim