I have a wall that is cracking in a couple of places. Two important points:
- This wall is not part of a building, it's like a fence or property boundary wall, but it's made of blocks of some sort, covered up so they look like one continuous surface
- It's not really so much cracking as it appears to be separation along the joint lines of the blocks. It goes all the way from the front to the back of the block.
There are two places in the wall which are cracking and both are near trees, so I'm wondering if the roots could be pushing up the ground under the wall and causing the cracking. None of these trees are on our property, so we can't remove them.
One of the set of cracks is occurring near a corner in the wall, and the cracking has formed a stair-step pattern starting about 15 feet from the corner and moving up towards the corner to within about 3 feet. When we purchased the property 3 years ago the previous owners had put expansion foam in the cracks to seal it (the cracking was around 3/4" or less, but within the last few months there was movement and now the cracks are at least double that.
My initial thought was to perhaps seal up the sides and pour mortar mix or concrete mix in the opening from the top. However there are a number of problems with this: due to the stair-step nature of the cracking, the mix wouldn't go all the way to the bottom; (but conversely, I don't know how I would force the mix into cracks to make it go all the way through); if the problem is caused by the ground moving it might just crack more as the ground continues to move, possibly in a different location on the fence, and I'm not sure concrete or mortar mix would hold the fence together against such forces anyway.
I'm trying to find a solution that will fit in the budget, i.e. I can't afford to have the fence removed to fix the ground and the replaced or something like that. I can afford some raw materials, but all the labor is going to have to be myself. Are there any solutions that will allow me to effectively deal with the problem?