I am doing some garden remodeling, which includes making sunken beds for veggies. To separate the beds, I am stacking cinder blocks. The problem is that the base is not level, and there are some places where existing work means that the blocks can be offset vertically by as much as an inch.
So what I need to do is to get the second level of blocks level, and get the gaps/vertical differences filled. How do I do this? Mortar? Concrete?
I need to be a little more explicit. I have the base line of blocks as level as I could get it, which is fairly close (I can usually get to about 3-5 mm). The bigger problem is where there is existing stuff that causes the office. These include fence bases, old walls, and old, buried railroad ties. I try and line up the blocks so the tops are at the same level as the obstruction, but I can't get it perfect.
The top of the cinder portion of the wall has concrete tops (landscape blocks), and even a little bit of a gap causes the blocks on top to be unsteady. I was thinking that mortar or whatever I should use might make everything more stable.
I will be walking on these (to weed, etc), and I noticed that some I built earlier are not stable. I think that the gravel might have settled, or something else. I'm not a pro, so I have done the first level incorrectly.
Thanks for any help/suggestions!