Author: Chris
Date: 10/6/2008 4:52 pm EDT
All three underlayments would be fine, but first lets see if you need underlayment to begin with.
Installing Avaire tile over 3/4"particle board is okay and installing additional layers of underlayment can cause height issues at transtions and appliances.
Let me know if you have any particular structural concerns so I can suggest the best underlayment for your project.
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