I have a freestanding hollow cinder block garage which was most likely built in the 1940's. When i moved into my house 10 years ago i noticed some cracks around the windows and also noticed that there were NO gutters! When it rained, it would just pour down the sides of the walls - one of which has a poured cement sidewalk (which was totally cracked and pitching up - and water was getting in between the cement and cider blocks).
I put gutters on the garage and had the poured cement area repaired and re-poured.
I do have to work on the grading in the front of the garage as it's a bit low - but i have started to see the original crack get wider within the past year or so (after i had the cement area re-poured). The mason who did this, was using a jackhammer and within this year, the back alley that runs behind the garage was re-done and they were using huge tamping machines. I am thinking that some of this caused the cinder blocks that have always been cracked to shift.
I put a level up to the bottom part of the wall and that is level - but up above where the crack is - is actually shifting inward (towards the inside of the garage) a bit. In fact, the bottom part is probably 1/4 inch forward from the top.
I explained the problem to a mason (without him looking at it) and he said he'd make a channel in the inside of the garage vertically through the blocks and then put a piece of rebar inside and cement it in.
I am sure that this is due to foundation issues - and perhaps some of the vibrations happening from the jackhammers - but i am wanting to try and stop the crack! Does anyone have any other ideas or suggestions? Or does anyone know why a cinder block wall would shift in like that?? I would think the bottom part would be the one out of level.
any thoughts would be greatly appreciated!
Here are some pics:
from the outside (crack at top is 1/4" inwards) https://www.dropbox.com/s/h09jbzxti23hlk6/2015-10-29%2015.59.37.jpg?dl=0
another view from outside: https://www.dropbox.com/s/hiybxl25vndz6ej/2015-10-29%2016.00.03.jpg?dl=0
the other sides of the garage have a few small cracks that have been there ad remain the same.