Why would they bother with chewing the
> blueboard when they could just walk right out the hole in the inner cover?
> Maybe they want more ventilation?
>    
  Maybe they don't like blueboard? That would be my guess. Having used 
styrofoam, pinkboard and blueboard for decades...and some I have is the 
first I ever bought, I cover the inner cover escape hole so they won't 
chew it. Mice ar more of a problem. Foam works well for inner cover 
insulation as long as there is no burr comb to hold the foam away from 
the inner. Never a wet spot above the cluster. Nice in the spring, too 
as you can tie it in bundles and store away for another year. Not easy 
to tie pillows, is it?
Mike

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