Yep, weeds and such will creep up the 1" of soil seeking sunlight. A burial
of 4" or more inches of soil may work. But, not 100% effective.
Consider getting rid of the current weeds first. Rake out the bare spots.
Then, put some topsoil or verified good sandy loam on top. If lightly done,
the former grass will break through. At least St. Augustine and Bermuda do
in my experiences.
Don't do anything until you've figured out why your lawn is full of weeds and
bare soil. Compaction? Fertility? Shade? Watering? Poor selection of
species? Too much foot traffic? Bad mowing?
Fix the problem(s) first.
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