geetee
Landlord.
There used to be an old myth that as glass is a liquid that old windows from 1800 - 1900s are thicker at the bottom as the glass runs however this has more to do with their inability to make uniform plate glass later invented by Pilkingtons ( I think).
Otherwise glass is fairly chemically stable if somewhat brittle.
Not even the strong alcohol of US IPAs can weaken it!
