Quote Originally Posted by bobyoe
For behind the liner, can't they put the same foam they use when building a new vinyl lined pool? That would minimize the effect of bumps in the gunite, wouldn't it? I'll check with my friend today on what is between her gunite and liner.
I built my own concrete pool and installed a liner from the beginning. I did use the same foam that they use for a new IG construction. I used it on the walls and steps....did a nice job.

You'll still need to get the gunite smooth, or as stated above, you'll feel almost everything. The foam compresses to about 1/16th of an inch at a depth of around 3 feet but it still does a nice job.

Dave S.