"Wash my fur, but don't get me wet!" One could certainly see it that way. Hello "Chriscross." >As cheap as possible< is always in contradiction to comprehensive material properties of a building material that the heart desires. Laminate, due to its low material thickness, is predestined for "drum effects," a term from the 1990s. Only mass and close coupling help here. Many years ago, I once launched a system aimed at installing laminate floor elements with a dry adhesive on an 8mm thick rubber granulate mat. That worked well; it shifted the high "clacking effect" when walked on almost entirely into low frequencies, which were not disturbing. The only drawback was the higher price. Consumers don't want that! But without investing money, you cannot acoustically convert an inexpensive floor system. The films, whether 2mm or thicker, only have the effect of "squeak protection." If sand grains lie on the screed surface during installation, well, it simply doesn't squeak that much when walked on. However, this has nothing to do with impact sound insulation! That is located under every screed in residential buildings and is at least 25mm thick. In conclusion: the advertising of such underlayment systems relies heavily on the aspect of impact sound reduction with much "fluff," so that a floor system already resonant by design can still be sold. The best sound insulation for floor elements, however, is full-surface bonding. Well, not every manufacturer approves their systems for this, but based on many years of experience with floors, I can say that this will work if done properly! Condition: the residential property is owned or a written approval from the owner has been given that bonding is allowed. -------------------------------------------- Regards: KlaRa