What is the best way to level a shower base?? Home › Forums › Public Forums › General Plumbing › What is the best way to level a shower base?? This topic has 1 reply, 2 voices, and was last updated 24 years, 1 month ago by Guest. Viewing 1 reply thread Author Posts 30 Nov 2000 at 8:28 pm #274021 MasterPlumbersKeymaster I have to install a Mannathan shower base on a basement floor what is the best way to level the base? Thank you. 30 Nov 2000 at 10:44 pm #289002 GuestParticipant I have found that a mortar mix is the best.just mix the mortar set shower and put a level on it. Author Posts Viewing 1 reply thread You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In