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3. Most importantly " Never use concrete to fill cavities."
I don't think filling cavities with concrete makes any sense at all.
1. In experience with removing trees filled with concrete. The concrete is always freestanding (except for the most recent years growth). Apparently concrete deteriorates healthy cells eventually. Concrete may provide a surface upon which the new cells may form and provide the tree with the ability to recapture it complete form but it eventually becomes independent from the structure and provides absolutely no structural benefit to the tree in the long-term.
2. There are other more desirable materials available.
I've been using Styrofoam. The expanding type you buy in a can. I usually remove any loose or unstable materials and fill deep cavities with wadded newspapers to the point of being within several inches of the desired surface area where cambial growth is present. I generally have to make two or sometimes three layers of foam to build it out in sufficient depth. At which once its cured I carve back to the desired position and scratch or irritate the adjoining cells . I understand from old timers this causes a faster growth rate at that point of irritation.
My concerns are these?
1. Will the scratching of these cells cause barriers to be broken and increase the decayed area to include those cells then being present.
2. Should I be so concerned with increasing the growth rate for an earlier coverage.
3. Might this irritation be sufficient when performed occasionally, mitigate or reduce the chances of rams horning.
4. Ive tried using plastic as a form but it prevents curing processes. Am going to try a fine plastic screen such as on doors or windows. Stapled in place as a form, so the surface is smoother and only needs to be dressed on the edges.
By the way. I have been using a custom mix latex spray paint to achieve the same color and protect the Styrofoam from deteriorating. It makes a great looking job you wouldn't believe. It takes a trained eye to spot the finished product
I realize most of you are aware of the ill effects concrete can have on trees. I just thought it was an interesting experience.
All in all I am not sure filling a cavity is necessarily the objective. Providing a surface for the new cells to converge on and build new wood however does seem beneficial structurally.
I sure would like to here about your experiences and methods used in treating cavities.
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