[TowerTalk] Adding Expanding Foam inside boom

David Gilbert xdavid at cis-broadband.com
Thu Apr 26 01:26:56 EDT 2018

Typical expanding foams like Great Stuff and others are open cell foam.  
The surface has a skin on it, but if you slice some of that with a knife 
you will find that it is as absorbent to water as a sponge.   The sun 
eats that stuff for breakfast, lunch, dinner and regular snacks during 
the day ... and for some reason birds love to pick at it ... so most 
likely you would end up adding weight to your boom over time due to 
water absorption.

It might be different if you were to use closed cell foam, but in my 
opinion you'd be far better off simply upgrading the boom.

Dave   AB7E

On 4/25/2018 7:49 PM, Charles Morrison wrote:
> Has anyone tried this ?
> Can it improve survivability of very large yagis?
> It won’t prevent a boom failure, but could it help last a little longer?
> -Charlie N1RR
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