Mass Loaded vinyl or rubber sheets are good Insulators for Sound waves. Microscopic pores on the surface of these materials help to trap sound vibrations.
Moreover, Rubber flooring is good for reducing noise & vibrations.
Water Stoppers are called by different names in different regions such as - Water Stoppers, Water Bars, and Water Stop Seals. They are used to prevent seepage across concrete joints. Mostly made from Poly Vinyl Chloride polymer.
Water stoppers are installed for expansion & contraction joints in concrete. they can be of Rubber or PVC ( as per recommendation)
for details: PVC Water Stopper Seals
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