Mouse solution

We might have found a solution to the rodent potential I discovered in my last post. We could simply spill up the stud bays with 75mm Heraklith board, eliminating any cavities. Of course that would make running wires a bit harder, but it would most definitely beef up the walls. 12 1/2 cm solid Heraklith should be almost equivalent to a brick wall, and the walls wouldn't sound hollow any more. Expensive though... we'll see.