Old glass panes are thicker at the bottom due to glass flow over time
the verdict
REFUTED
the evidence says no
confidence 10/100
Although old glass panes are sometimes thicker at the bottom, scientific consensus and historical manufacturing records show this is due to how the glass was originally made by glassblowers, not because glass slowly flows over time.
Evidence against · 2
Wikipedia: Glass
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Reference article covering this claim directly
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More against · 1
physics.stackexchange.com: Do glass panes become thicker at the bottom over time?
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Confirms panes are sometimes thicker at the bottom, but due to manufacturing techniques, not glass flow.