How much should the floor in my wetroom slope? Depends on the drain but we have found about 1.5% (1:80) is adequate By admin|2018-09-14T12:58:41+00:00March 12th, 2018|Installers - Wetrooms and Showers, Technical - Wetrooms and Showers| Share This Story, Choose Your Platform! facebooktwitterlinkedinreddittumblrpinterestvkEmail Leave A Comment Cancel replyYou must be logged in to post a comment. This site uses Akismet to reduce spam. Learn how your comment data is processed.