SB: How do I?

[Jennifer Altenbach <jeliza@unm.edu>]

Hello,
I just have a general construction question and often you folks can
answer things much faster and better than books. So here goes:
We're putting a 12" wide by 8" deep concrete footing into an 18" deep
trench for a small porch addition to our house.  We are told we don't
have to build forms, rather can pour it directly into the trench (our
soil is rock hard--fun to dig down to 18"!).  What I don't yet
understand is how we level the top surface of the footing?  With forms
you can mark on them where the height of the concrete should be, but how
do you do this right into a trench?  Put some kind of markers in along
the walls of the trench?
A beginner,
Jenny


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