Toilet Flange Installation Video
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The toilet flange must be installed on top of the cement board just before the ceramic tile goes in place. It is critical how it is mounted. Mark a line across the flange where the toilet bolts come up. Install this flange so the mark is exactly parallel with the wall. This will ensure that the toilet is square with the wall.
Tim built custom homes and did ultra-custom remodeling for 20+ years before launching his Ask the Builder media presence. He was selected as one of the Big 50 by Remodeling magazine in 1993. This award gave birth to Ask the Builder in October 1993. Tim also operates https://DrawPlumbingPlans.com. His @askthebuilder YouTube channel was the first home improvement channel on YouTube.