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Old 08-29-2009, 07:49 AM
Senior MemberCaptains Club Member
Join Date: Jan 2003
Location: Houston,Tx,U.S.A
Posts: 11,696

Personally I would pour leveling mix to build up the thickness and then use these extenders.

Closet Flange Extender
  • for raising floor height when adding ceramic tile or hardwood
  • stackable to desired height
  • 1/4" thick

and or possibly this

Extra Thick Toilet Bowl Gasket

Model # 001115-24 by William H. Harvey
$3.49 In Stock - Estimate Delivery Date
Extra thick wax gasket with 40% more wax saves using two wax rings for faster installation and a more positive seal. Polyethylene flange. For problem areas that need extra thick wax gasket. Fits 3" or 4" Lines. This Extra Thick Toilet Bowl Gasket is one of many top quality items in our Wax Rings department.
Aubuchon Item # 604517
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