4,021 lbs., is the average weight of a car according to an archived NY Times article. This 8" reinforced concrete slab (with #8 rebar and a W10x54 steel beam) with interior dimensions 10' x 18' (approx) can support about 12 times that weight (based on 300 lbs. per sq ft).
An aerial view (or at least from our roof) shows the finished product.
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