[Cob] Silverfish, Tornadoes, and Humidity

[CarmenKittieCat at aol.com]

I am in St. Louis, MO, USA, considering building a cob house for many  
reasons (and there are so many...), but my fiance and I are wondering about a  few 
things. I have searched the Internet but haven't been able to find anything  
thus far about these particular topics.
 
First, I read this page: _http://www.weblife.org/cob/cob_061.html#termites_ 
(http://www.weblife.org/cob/cob_061.html#termites)  where  Becky Bee discusses 
potential problems with termites and silverfish. She offered  a suggestion for 
preventing termite problems, but then went on to describe a  problem someone 
has with silverfish, and she said she knew of no "nontoxic"  solution. How 
common is the silverfish problem and has anyone yet found a  nontoxic solution to 
the challenge?
 
And then, what about tornado resistance? Given that the roof might  come off 
during a tornado, how would the building itself hold up? Tornadoes are  rather 
unpredictable, but generally speaking, with no regard to the potential  rain 
involved, how well do curved cob walls hold up to tornadic winds or the  
associated high winds in nearby ares during a tornado?
 
Finally, humidity. I have read that the cob walls are very slow to  respond 
to temperature change, etc., but I am concerned about humidity--not rain  so 
much as the "thick" air, you know what I mean, and for extended periods  of 
time. In the summer we can have weeks of H-E-double-hockeysticks where  the 
humidity drives the heat index very high, day after day. Does the  humidity permeate 
the cob walls at all? Not to mention the plaster, how  does that hold up? Can 
humidity be a problem over time, even though it's  merely one season out of 
the year?
 
Thank you!
Carmen