That thin aluminum sheet is known as "flashing". It has
a variety of construction uses. One can find it near
roofing materials in hardware stores, either cut into
small squares or in rolls of various widths.
Most of the flashing that I have seen is light enough
for the wind to lift it up and move it around, so one
may want to weight it down with a rock or put a little
dirt on top of it around the edges to keep the wind
from getting under it.
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