Factors affecting sound attenuation

In cavity wall and floor construction the sound attenuation can be increased by

Some of the factors above are more important than others. Some may be insignificant in certain types of construction. The type of sound-absorbing material sometimes has an effect on the sound insulation and sometimes it does not. The algorithms take these factors into account and give predictions of sound ratings for common wall and floor constructions that satisfy the important requirements above.

If you cannot get an estimate for a particular construction, there are two possible reasons.