A:If you can figure out a way to put some mortar mix under it thats how it should of been done by the Plumber you want to be careful using spray foam it could dis- figure the pan if its on the ground floor you may be able to go under on the post&beam find the shower drain we usually cut a 6x6 hole for that you might be able to shim somthing there.Good luck Bob the Plumber
