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It sounds like the existing laminate flooring is solid and free from flex. If so, you will have no problem installing the new laminte over the old. You will want to use a sound absorbing pad underneath to avoid a hollow sound as well as potential squeeks between the 2 laminate surfaces. Best of luck!
D.R. Domenichini Coosntruction
I probably would not recomend it. A laminate floor is a floating floor and the flex, expansion and contraction of both as well as the hollow sound you can have with a laminate may give you undesireable results. Laminates come out very easily and I feel it worth your while to remove the 1st laminate to elimate any future floor structural issues and install the new floor to the manufacturer's specifications.
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