![]() Different buildings have different financial demographics. This is a question that must be answered by the board of directors in conjunction with information the PM or consultant brings to the table.What is a reasonable requirement for the financial demographics of your building? Does it meet the IIC requirement of this building? It should be noted that unless specifically requested by the flooring manufacturer, vapour barriers are not required for installations on cured concrete above grade.Ģ.Different underlayment only influences STC ratings by a miniscule amount underlayment has almost no mass. Higher is better but it’s only relevant if they tell you what the whole assembly is. That thin piece of rubber, foam, cork or felt has nothing to do with increasing or decreasing the STC rating. Airborne sound only respects mass or separated mass. The second thing that should throw up red flags for a PM is the inclusion of a Sound Transmission Class (STC) rating in the product literature or packaging.That’s what happens in real life and why the acoustic performance of so much acoustic underlayment degrades so quickly. There is no requirement to ‘put a book case on it’ and come back in six months and test it then – to see if the material has crushed out. The testing is always done on new (fluffy) material. ![]()
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