[Bell Historians] Sound deadening

[David Bryant]

>>From a purely acoustical point of view, you understand, old bits of carpet
>and mattress have much to commend them (cf. Milton Abbey). At all events
>avoid anything like sand or dense plaster. Also, if using timber, softwood
>performs better than hardwood.

A sandwich floor composed of a layer of thick expanded polystyrene sheets 
between two layers of softwood boarding works quite well.

David