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The laying of agglomerated wooden slabs on the floor of my converted attic made it curl between each lombard. Which material to use for a right floor covering? We thought of installing laminate flooring.

There is no stratified "parquet". In commerce, we find either parquet (the visible part being made of wood, solid or laminated), laminate (the visible part is a decoration that imitates the wood).
These two materials must be placed on a stable and flat support. It is likely that the thickness of the panels in place is too small compared to the distance between the joists. It would be preferable to lay panels of greater thickness or to add intermediate joists after removal of the old panels. The joists will reduce the distance between the panels.

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