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Injected polyurethane foam cavity insulant can be used to insulate hard-to-treat housing.
The cellular pore structure of cedar makes it a superb acoustic insulant with better sound dampening properties than most other structural materials.
Mineral wool is the most commonly used material, although you may use rigid board insulants, and any loose fill insulant also works if you can easily construct a way of containing it.
World sales of vermiculate, another insulant when exfoliated by heating, are about 640,000 t/y.