extra underlayment for laminate with preattached underlayment

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minimii

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Dec 4, 2011
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Hi,
We bought the costco laminate with preattached underlayment for first floor that is concrete slab. I am thinking to put an extra layer of underlayment for better insulation. I was recommended to use "selitac underlayment".
I wonder would the extra underlayment cause any problem in the long run? 'Cause I image the floor would not as freely to float because the friction between the layments. If yes, what is a good way for extra insulation? If no, is selitac a good choice? It is about $50 per 100 sqft.

Thanks
 

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