01-21-2008, 02:00 PM
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Member
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Join Date: Mar 2007
Location: Ormond Beach, Florida
Posts: 8,238
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Re: Antenna attachment to chimney prohibited?
From the 206 IRC.
- R1003.8 Additional load. Chimneys shall not support loads other than their own weight unless they are designed and constructed to support the additional load. Construction of masonry chimneys as part of the masonry walls or reinforced concrete walls of the building shall be permitted.
An antenna catches quite a bit of wind and will transfer that wind load to the chimney, so, while it is 'not a good idea', it could also be stated that 'it is not allowed' either.
A lightning rod, on the other hand, will transfer very little wind load to the chimney ... however ... I did not find the words 'except for very little loads' in there ... 
I guess it would come down to 'common sense' - if whatever is on / mounted to the chimney can cause some extra loading to the chimney and put it at risk ... 'not a good idea' and 'not allowed', but, if it is not going to place any load to speak of on the chimney, then ... you make the call. 
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