I am making a footer for the base of my spa. I need to make a 7' square
footer, and have decided to use cinderblocks since I have so many of them.
I dug the trench, and now am trying to get them all level. It is important
for it to be level since the spa will sit on top, and I want it level. The
outer walls of the spa will rest on the cinderblocks, and then on the
inside, I will fill it with peagravel, which will actually support the
weight of the spa. I will be filling the vacant spaces in the blocks with
concrete, an figure I will drive some rebar stakes down into the ground in
I am having a dickens of a time getting all the blocks level and straight.
Then I had an idea. Would it be easier to run string lines all around the
outer edge slightly higher than the blocks, then pour concrete in, and
wiggle the blocks upwards until they are true to the string? Keep working
them until the concrete sets enough to hold them fast? Right now, I have
been around the 28' length of the footer, lifting, filling, tamping, and
tweaking, and then getting back to square one, and it not being right.
Yesterday, I just walked away from it in frustration, and a little later,
the idea of pouring the concrete and floating the blocks came to mind.
The cinderblocks each have a small kickout and indentation on the ends, and
interlock slightly. I will be using sack concrete, so will be going slower
then having a truck pour it. This doesn't have to be PERFECT, but it does
have to be close to keep the spa from sagging or cracking.