: Also is one required on storm water?

: Any and all information would be deeply appreciated

Sylvan Thank you, I asked my instructor this morning and he said your right on the money.

Now I see why you said not all so called plumbers are plumbers. I guess HJ missed your roof drain dome/cover posting.

He never bothered to read how to figure area. Thank you so much. for now on I will just sent you personal e mails.

I took your advice and bought Raymond Massy book