Rebar and plumbing... is this right?
I have seen countless pictures of pools during construction that show two specific details widely used:
1) Concrete chunks or dobies used to support the rebar instead of metal chairs.
2) Plumbing run on ground surface under rebar, leaving no space between pipe and rebar.
Seems to me that concrete chunks or dobies will create large voids in the gunite shell under the rebar... and that pipe runs will create long voids and weak spots in the gunite.
But I see this in MANY pictures on here and other web sites of pools being built.
I guess my question is, are these as serious issues as I believe they are? It seems like very little work to trench in the main drain line so you get full 3" min gunite under rebar even where the pipe is... and it seems metal chairs should be the same cost or cheaper than blocks. In fact, I thought I saw somewhere on here that someone mentioned that using blocks was a code violation.
I'd appreciate feedback...