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WebFeb 12, 2024 · Marketing for floor underlayment productsBut, these materials will be able to claim rating that is several times higher than that which would even be physically possible … WebThe STC rating of a CMU wall can be estimated based on its weight using the following formula: STC = 0.18W + 40. where W = pounds per square foot (psf) This information is … WebOct 2, 2024 · Although it may seem like a small part of the project, correctly understanding impact insulation class/sound transmission class (IIC/STC) ratings as well as choosing acoustical underlayments can have an immense effect on the lifetime profitability of a project and value of repeat clients and customers. hogwarts mystery year 7 chapter 31