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Is Such a Heavy Concrete Wall Insulating?

When they had to prescribe the means of sound insulation between two rooms, both the small contractor and the end user of a small extension project decided a heavy-cast concrete wall would do fine. However, when the time for trials came, both were startled to discover that some rather high-pitched transmitted noise could easily be heard.

Looking closely at the work, an acoustician invited to have a look quietly pointed out that the cause was to be found in the improperly filled holes in the wall that previously connected both sides of the casting frame.

Lesson Learned: The overall acoustical performance is dependent not only on the chosen material, but also on the modus operandi.

A Small Dance Floor

A small dance room (capacity: 10 persons maximum) had been fitted in a public building in what formerly used to be a small storage space. The floor covering was of a PVC type.

When people were dancing on that floor, the lighting fixture in the service dwelling underneath made strong oscillations. More to the point, the dancers were complaining of the uncomfortable conditions on such a floor (Let’s face it: The floor was too stiff for the dancers but too weak for acoustic purposes).

The whole floor assembly was eventually replaced by a thick concrete slab and a wooden floating floor on resilient joists, which solved the problem.

 
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