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In Reply to: RE: DIY acoustic door help needed posted by LewinskiH01 on June 28, 2009 at 17:46:52
Well, here in Australia we have some batting products made from materials like dense cotton wadding or polyester which are intended to block sound transmission. Fibreglass batting should also work but you'd want to make sure the door cavity is sealed to prevent fibre escape.
Brick and concrete will certainly reduce transmission but are the internal walls made of brick or concrete, or are they dry wall or some other construction? Sound can also travel to other rooms via ceiling cavities.
The biggest problem with sand as a door fill is simply its weight. You're going to need strong hinges to support the mass of the door and the bottom edge of the door is also going to have to support the mass of the sand. I'd rather go with something a lot lighter if I could or you could end up with a door coming off its hinges or leaking sand, neither of which are good outcomes.
For the door edges simply try products used for weather sealing doors. They should do a good job of sealing the gaps and minimising sound escaping that way. You could do that at the kids doors also but it will prevent air flow so you're going to want some other ventilation source like a window or the rooms may become stuffy.
David Aiken
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