Step 4 · Secure the Extender and Closet Bolts

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

Immediately after applying the sealant, carefully place the flange extender onto the silicone bead. Press down firmly and evenly to spread the silicone and create a tight bond. Align the closet bolt slots of the extender with the slots on the old flange. Insert the new, longer closet bolts (often included with the extender kit) through the aligned slots. Slide them into the narrow part of the slot to hold them upright. Next, secure the extender to the subfloor. Drive the provided corrosion-resistant screws through the countersunk holes in the extender and firmly into the wood subfloor using a drill or screwdriver. Do not overtighten the screws, as this could crack the extender.