This wall has stood for about 12 years so far and I'm sure that if we were not planning on increasing its height it would probably be stand for quite a few more years. However, disturbing the structure and adding extra weight to the top of it would definitely reduce its stability significantly. Now we have a bit of an issue - whether to completely rebuild the entire wall or to try to fix what is there. One thing is for certain... it is not worth risking building on top of it as is.
How not to build a wall...
This wall has stood for about 12 years so far and I'm sure that if we were not planning on increasing its height it would probably be stand for quite a few more years. However, disturbing the structure and adding extra weight to the top of it would definitely reduce its stability significantly. Now we have a bit of an issue - whether to completely rebuild the entire wall or to try to fix what is there. One thing is for certain... it is not worth risking building on top of it as is.