Re: Tree-to-Ground Guying Something that I do, when I want to document a recomendation, for work on a particularly hazardous tree, that the customer does not want to remove, is to mail, thru the old snail mail, my recomendations with "return reciept requested". This way I have their signature on an official US document from the US Post Office that says they have received my recomendations, along with the date they received it.
After reading the whole thread I will stick with my original thought. Based upon the amount of decay damage visible on the outside of the trunk, and the description of how far you could insert a handsaw into the trunk, I would be recomending removal of that tree. There are just too many targets for that tree to hit and far to extensive decay to ever think that you could "make it safe".
To think that this tree is going any way but downhill from here is delusional. It will be a process of constant monitoring and deadwood removal inspite of all efforts at soil remediation, fertilization, and anything else that can be done.
I have installed tree to ground anchoring systems for basically healthy trees that were exposed to potentially strong winds blowing in off the ocean, especially during the hurricane season. I know that these type of systems do work as none of the trees we protected came down even if they did lose some branches. It is just that in this case we are not starting with a healthy tree. What we are talking about here would be like trying to build a tall building on a weak and compromised frame. It might look OK, but it will not last.
If the customer is going to ignore your "professional" recomendations then you need to have them sign off on them. Just to CYA.
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