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QuietWalk Laminate and Floating Wood Flooring Underlayment with Attached Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 3'Wx33'4"L Roll (Covers 100 sq. ft) QW100B1LT - Carpet Underlayments - Amazon.com
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Good Quality 12mm PU Foam Carpet Underlay - China Carpet Underlay, PU Foam Underlay | Made-in-China.com
![What's the best thinnest thing to cover these gaps in floorbaords with before 9mm underlay and carpet? Worried I'll be able to feel the gaps through the carpet. : r/DIYUK What's the best thinnest thing to cover these gaps in floorbaords with before 9mm underlay and carpet? Worried I'll be able to feel the gaps through the carpet. : r/DIYUK](https://preview.redd.it/whats-the-best-thinnest-thing-to-cover-these-gaps-in-v0-y0l96cmcq20b1.jpg?width=640&crop=smart&auto=webp&s=73c5dbc1dbe51bcea2861b8885e72070b1981c10)